GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
ALARMS INTERPRETATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
BTGJ1_1_ALM
BEARING METAL TEMP GEN #1 HIGH
The generator bearing metal temperature #1 is very high
BTGJ1_2_ALM
BEARING METAL TEMP GEN
JOURNAL #1 HIGH
The generator bearing metal temperature (journal #1) is
high
BTGJ2_1_ALM
BEARING METAL TEMP GEN #2 HIGH
The generator bearing metal temperature #2 is very high
BEARING METAL TEMP GEN
JOURNAL #2 HIGH
BEARING METAL TEMP TURBINE
JOURNAL #1 HIGH
BEARING METAL TEMP TURBINE
JOURNAL #1 HIGH
BEARING METAL TEMP TURBINE
JOURNAL #2 HIGH
BEARING METAL TEMP TURBINE
JOURNAL #2 HIGH
BEARING METAL TEMP TURBINE
JOURNAL #3 HIGH
BEARING METAL TEMP TURBINE
JOURNAL #3 HIGH
BEARING METAL TEMP THRUST
ACTIVE 2 HIGH
BEARING METAL TEMP THRUST
ACTIVE 5 HIGH
BEARING METAL TEMP THRUST
ACTIVE 8 HIGH
BEARING METAL TEMP THRUST
INACTIVE 2 HIGH
BEARING METAL TEMP THRUST
INACTIVE 5 HIGH
The generator bearing metal temperature (journal #2) is
high
BTGJ2_2_ALM
BTJ1_1_ALM
BTJ1_2_ALM
BTJ2_1_ALM
BTJ2_2_ALM
BTJ3_1_ALM
BTJ3_2_ALM
BTTA1_2_ALM
BTTA1_5_ALM
BTTA1_8_ALM
BTTI1_2_ALM
BTTI1_5_ALM
OMMO_5_9E_E0858_EN_V3
The turbine bearing metal temperature (journal #1) is high
The turbine bearing metal temperature #1 is very high
The turbine bearing metal temperature (journal #2) is high
The turbine bearing metal temperature #2 is very high
The turbine bearing metal temperature (journal #3) is high
The turbine bearing metal temperature #3 is very high
The bearing metal temperature (thrust active) is high
The bearing metal temperature (thrust active) is high
The bearing metal temperature (thrust active) is high
The bearing metal temperature (thrust inactive) is high
The bearing metal temperature (thrust inactive) is high
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Revision : A
ACTIONS TO BE TAKEN
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Check bearing.
Check lube oil system and drain piping
Date : 10/2011
Page :1/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
BTTI1_9_ALM
BEARING METAL TEMP THRUST
INACTIVE 9 HIGH
The bearing metal temperature (thrust inactive) is high
Check bearing.
Check lube oil system and drain piping
L12H_ACC_ALM
PROTECTIVE MODULE
ACCELERATION TRIP _ HP
L12H_ALM
ELECTRICAL OVERSPEED TRIP _ HP
L12H_FLT_ALM
L12H_P_ALM
LOSS OF PROTECTIVE HP SPEED
INPUTS
PROTECTIVE MODULE OVERSPEED
TRIP _ HP
The speed control system has not limited turbine speed with
the trip limits (fault detected by P module).
The turbine trips during the electrical over-speed test.
The speed control system hF not limited turbine speed
within the trip limits.
The turbine trips during the electrical over-speed test.
Card VPRO fault
Protective module over-speed fault.
The trip circuit has been tripped by mechanical over-speed
action.
L12HBLT_ALM
OVERSPEED BOLT TRIP _ HP
L12HF_ALM
Control speed signal loss and the unit trips.
CONTROL SPEED SIGNAL LOSS _ HP Power supply fault, ground, short-circuit open.
Speed magnetic pickups fault.
L12HFD_C_ALM
L12HFD_P_ALM
CONTROL SPEED SIGNAL TROUBLE
- HP
PROTECTIVE SPEED SIGNAL
TROUBLE - HP
Determine and repair before restarting (mechanical,
electrical or fuel or speed control trouble).
Check the card VPRO in the module P
Check the module over-speed (power supply, short, link,
cut).
Search the cause of this problem:
Check electronic over-speed system.
Check proper operation and setting of over-speed bolt
assembly.
Repair before starting and reset manually the mechanical
over-speed limit switch on the over-speed bolt.
Check speed system.
Check supply, connections.
Check the logic circuit.
Check speed magnetic pickups.
Signal from speed sensors is faulty.
Check speed sensors and wiring.
Signal from speed sensors is faulty.
Check speed sensors and wiring.
L20FTY_ALM
CRUDE TO DIST FUEL XFER FAULT
Transfer valve fault
L20FTZ_ALM
DIST TO CRUDE FUEL XFER FAULT
Transfer valve fault
L25A_ENAB_AL
K25A RELAY HAS NOT BEEN
ENABLED
Synchronization permissive disable
OMMO_5_9E_E0858_EN_V3
Determine and repair before restarting (mechanical,
electrical or fuel or speed control trouble).
All right reserved Copyright
Revision : A
Check proper operation of transfer valve
Check limit switch.
Check proper operation of transfer valve
Check limit switch.
Check synchronization permissive
Date : 10/2011
Page :2/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L26AAH_ALM
ATOMIZING AIR TEMP. HIGH
Temperature high at the atomizing air compressor input.
L26AAL_ALM
ATOMIZING AIR TEMPERATURE LOW
Temperature high at the atomizing air compressor input.
L26BW_ALM
L26CR1H_ALM
L26CR1HH_ALM
L26CR2H_ALM
L26CR2HH_ALM
L26CR3H_ALM
L26CR3HH_ALM
ON LINE WATER WASH TEMP NOT
OK
CRANKING MOTOR TEMP HIGH
PHASE 1
CRANKING MOTOR TEMP VERY
HIGH PHASE 1 TRIP
CRANKING MOTOR TEMP HIGH
PHASE 2
CRANKING MOTOR TEMP VERY
HIGH PHASE 2 TRIP
CRANKING MOTOR TEMP HIGH
PHASE 3
CRANKING MOTOR TEMP VERY
HIGH PHASE 3 TRIP
Check water supply to the atomizing air pre-cooler,
isolating valve position flow restrictions.
Check proper operation of thermostatic valve VTR_2 and
temperature switch 26AA_1.
Check water supply to the atomizing air pre-cooler,
isolating valve position flow restrictions.
Check proper operation of thermostatic valve VTR_2 and
temperature switch 26AA_1.
On line temp NOT OK
Check heater system
The temperature of the phase R of the cranking motor is
high
The temperature of the phase R of the cranking motor is
high
The temperature of the phase S of the cranking motor is
high
The temperature of the phase S of the cranking motor is
high
The temperature of the phase T of the cranking motor is
high
The temperature of the phase T of the cranking motor is
high
Check the phases R of the cranking motor
Check the electrical circuit
Check the phases R of the cranking motor
Check the electrical circuit
Check the phases S of the cranking motor
Check the electrical circuit
Check the phases S of the cranking motor
Check the electrical circuit
Check the phases T of the cranking motor
Check the electrical circuit
Check the phases T of the cranking motor
Check the electrical circuit
Check air conditioners (proper operation, power supply).
Clean the air conditioner filters, if necessary.
Check the proper operation of the thermocouple 26 CT.
NOTE:
The control compartment doors must be closed.
Check the temperature switch 26 FD_1.
Check the forwarding distillate fuel system.
Check the heater system of the distillate fuel (if used).
Check the proper operation of the temperature switch
26 FD_1.
Check the heating system.
L26CTH_ALM
CONTROL PANEL TEMPERATURE
HIGH
Air conditioners not maintaining proper temperature.
L26FDH_ALM
DISTILLATE FUEL TEMPERATURE
HIGH
The temperature of the distillate fuel is too high.
L26FDL_ALM
GAS OIL HEATER _ TEMPERATURE
LOW
The temperature of the gas oil is low.
Temperature switch fault.
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
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Revision : A
Date : 10/2011
Page :3/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L26FDLY_ALM
LIQUID FUEL TEMPERATURE
MEASURE FAULT
The temperature of the liquid fuel is faulty.
Check the temperature switch 26 FD_1.
Check the forwarding distillate fuel system.
Check the heater system of the distillate fuel (if used).
Fuel pump #1 temperature fault
Check the pump # 1
Fuel pump #2 temperature fault
Check the pump # 2
Gas fuel temperature very is high.
Check the proper operation of the temperature switch
FTG.
Check the gas skid (motor, fan, circuit, etc…)
The measure of the heavy fuel temperature is faulty.
Check temp sensor.
L26FDPT1H_ALM
L26FDPT2H_ALM
L26FTGH_ALM
L26FTH_ALM
L26FU1H_ALM
L26FU1L_ALM
L26FU2LA_ALM
L26FUPT1H_ALM
L26FUPT2H_ALM
L26GGC1_ALM
L26GGC2_ALM
L26GGH1_ALM
L26GGH2_ALM
L26GS10T12HA
L26GS1HH_ALM
L26GS1T3H_AL
FUEL PUMP #1 TEMPERATURE
FAULT
FUEL PUMP #2 TEMPERATURE
FAULT
GAS FUEL TEMPERATURE HIGH
HEAVY FUEL TEMP. MEASURE
FAULT
HEAVY FUEL OIL HIGH
TEMPERATURE DURING HFO
OPERATION
LIQUID FUEL TEMP LOWER THAN
HEAT TRACING SETPOINT
HEAVY FUEL TEMPERATURE LOW
HIGH TEMPERATURE INSIDE PUMP
P201 - CHANGE OVER
HIGH TEMPERATURE INSIDE PUMP
P202 - CHANGE OVER
GEN COLD AIR TEMP HIGH
GEN COLD AIR TEMP VERY HIGH
SHUTDOWN
GEN HOT AIR TEMP HIGH
GEN HOT AIR TEMP VERY HIGH
SHUTDOWN
GEN STATOR WIND. CENT. TEMP
HIGH #10-11-12
GEN STATOR WIND. CENT. TEMP
VERY HIGH #1-2-3
GEN STATOR WINDING CENTER
TEMP HIGH #1-2-3
OMMO_5_9E_E0858_EN_V3
Generator cold gas temperature high
Check the temperature measure system of the heavy fuel
oil
Check RTD
Check the temperature measure system of the liquid fuel
Check RTD "ftl"
.
Check the temperature measure system of the heavy fuel.
Check the temperature measure system of the heavy fuel
Check RTD fupt1
Check the temperature measure system of the heavy fuel
Check RTD fupt2.
Check cooling and sealing system
Generator cold gas temperature high shutdown
Check cooling and sealing system
Generator hot gas temperature high
Check cooling and sealing system
Generator hot gas temperature high Normal shutdown
Check cooling and sealing system
Generator Overload
2 of 3 Generator RTDs failure
Generator Overload
2 of 3 Generator RTDs failure
Generator Overload
2 of 3 Generator RTDs failure
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
heavy fuel oil temperature is faulty.
Liquid fuel temperature is too low.
Heavy fuel temperature is too low.
Liquid fuel temperature is too high.
Liquid fuel temperature is too high.
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Revision : A
Date : 10/2011
Page :4/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L26GS2HH_ALM
L26GS3HH_ALM
L26GS4HH_ALM
L26GS4T6H_AL
L26GS7T9H_AL
L26HA11HH_AL
L26HA11LL_AL
L26HAHH_ALM
L26HALL_ALM
L26HGHH_ALM
L26HGLL_ALM
L26HTHH_ALM
L26HTLL_ALM
L26PMBT1L_AL
L26PMBT2L_AL
L26QA_ALM
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
GEN STATOR WIND. CENT. TEMP
VERY HIGH #4-5-6
GEN STATOR WIND. CENT. TEMP
VERY HIGH #7-8-9
GEN STATOR WIND. CENT. TEMP
VERY HIGH #10-11-12
GEN STATOR WINDING CENTER
TEMP HIGH #4-5-6
GEN STATOR WINDING CENTER
TEMP HIGH #7-8-9
HEAT VENT VERY HIGH TEMP. IN
DLN COMPARTMENT
HEAT VENT VERY LOW TEMP. IN DLN
COMPARTMENT
HEAT VENT VERY HIGH TEMP. IN
AUXILIARY COMPARTMENT
HEAT VENT VERY LOW TEMP. IN
AUXILIARY COMPARTMENT
HEAT VENT HIGH TEMP. IN LOAD
COMPARTMENT
HEAT VENT VERY LOW TEMP. IN
LOAD COMPARTMENT
HEAT VENT VERY HIGH TEMP. IN
TURBINE COMPARTMENT
HEAT VENT VERY LOW TEMP. IN
TURBINE COMPARTMENT
PERF MONIT INSTRUM BOX #1 TEMP
VERY LOW
PERF MONIT INSTRUM BOX #2 TEMP
VERY LOW
Generator Overload
2 of 3 Generator RTDs failure
Generator Overload
2 of 3 Generator RTDs failure
Generator Overload
2 of 3 Generator RTDs failure
Generator Overload
2 of 3 Generator RTDs failure
Generator Overload
2 of 3 Generator RTDs failure
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
DLN compartment temperature very high
Start cooling fans
DLN compartment temperature very low
Check cooling fans
Accessories compartment temperature high
Start cooling fans
Heating and ventilation fault
Check heating and ventilation system
Heat vent very high temp. In load compartment
Check cooling and sealing system
Heat vent very low temp. In load compartment
Check cooling and sealing system
Gas turbine compartment temperature high
Start cooling fans
Turbine compartment temperature low.
Check the ventilation system.
Performance monitoring instrumentation box #1 temperature
regulation fault
Performance monitoring instrumentation box #2 temperature
regulation fault
Check performance monitoring instrumentation box #1
temperature regulation
Check performance monitoring instrumentation box #2
temperature regulation
Check for proper operation of the lube oil heat
exchangers, cooling water fans (proper rotation) and
temperature regulating valve VTR_1.
Check for proper operation of the temperature switch
26 QA_1.
LUBE OIL HEADER TEMP. HIGH
OMMO_5_9E_E0858_EN_V3
Lube header temperature above recommended limits. (See
piping schematic).
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Revision : A
Date : 10/2011
Page :5/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L26QN_ALM
LUBE OIL TANK TEMP. LOW
Lube tank temperature below recommended limits (see
piping schematic).
L26QT_ALM
LUBE OIL HEADER TEMP. HIGH TRIP
Lube header temperature above recommended limits.
L26WC_FLT
COOLING WATER TEMPERATURE
FAULT
Cooling water temperature fault.
COOLING WATER TEMPERATURE
VERY HIGH
Cooling water system fault.
Pipes, radiators are dirty.
Cooling fan motor fault.
Temperature sensor fault.
Leakage.
WASTE TANK TEMPERATURE HIGH
WATER INJECTION COMPARTMENT
TEMPRATURE VERY HIGH
WATER INJECTION COMPARTMENT
TEMPERATURE VERY LOW
Waste tank temperature high
Water injection compartment temperature fault.
Thermocouple fault.
Water injection compartment temperature fault.
Thermocouple fault.
L27BLN11_ALM
BATTERY CHARGER AC
UNDERVOLTAGE
Battery charger AC under-voltage.
Charger faulty.
L27BLN12_ALM
BATTERY CHARGER AC
UNDERVOLTAGE
Battery charger AC under-voltage.
Charger faulty.
L27BLN13_ALM
BATTERY CHARGER AC
UNDERVOLTAGE
Battery charger AC under-voltage.
Charger faulty.
L27BLN21_ALM
BATTERY CHARGER # 2 AC
UNDERVOLTAGE
Battery charger # 2 AC under-voltage.
Charger faulty.
L26WCHH_ALM
L26WP1_ALM
L26WRHH_ALM
L26WRLL_ALM
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
ACTIONS TO BE TAKEN
Check for proper operation of the lube oil tank heaters.
Starting is inhibited if the header temperature is low.
Check for proper operation of the temperature switch
26QN_1.
Check for proper operation of the lube oil heat
exchangers, cooling water fans (proper operation) and
temperature regulating valve VTR_1.
Check the temperature switches 26 QT_1A and 26 QT_1B
setting points.
Check the proper operation of the temperature sensor.
Check the cooling water system.
Check cooling water system (fan motor, radiator,
cleanliness of circuit, skid).
Check the proper operation of the temperature sensor
26 WC.
Check the correct circulation of the water in the circuit.
Check the proper operation of the water pump.
Check waste tank
Check the thermocouple AT-WI-1. (Wiring, connection,
etc…).
Check the thermocouple AT-WI-1. (Wiring, connection,
etc…).
Check battery charger AC breaker.
Check voltage magnitude.
Check the proper operation of the battery charger.
Check battery charger AC breaker.
Check voltage magnitude.
Check the proper operation of the battery charger.
Check battery charger AC breaker.
Check voltage magnitude.
Check the proper operation of the battery charger.
Check battery charger AC breaker.
Check voltage magnitude.
Check the proper operation of the battery charger.
Date : 10/2011
Page :6/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L27BLN22_ALM
BATTERY CHARGER # 2 AC
UNDERVOLTAGE
Battery charger # 2 AC under-voltage.
Charger faulty.
L27BLN23_ALM
BATTERY CHARGER # 2 AC
UNDERVOLTAGE
Battery charger # 2 AC under-voltage.
Charger faulty.
L27BN_12_ALM
AC BUS NORMAL INFORMATIONS
MISMATCH
Bus synchronizing potential not available.
L27BN_ALM
BUS UNDERVOLTAGE - NO AUTO
SYNCH
Bus synchronizing potential not available.
L27BP1N_ALM
DC SUPPLY #1 CRITICAL FAULT
DC supply #1 critical fault
L27BP2N_ALM
DC SUPPLY #2 CRITICAL FAULT
DC supply #2 critical fault
L27BZ_12_ALM
AC BUS UNDERVOLTAGE
INFORMATIONS MISMATCH
Bus synchronizing potential not available.
L27DZ_ALM
BATTERY DC UNDERVOLTAGE
Battery system voltage is low.
Battery charger is not functioning properly.
Excessive drain on the batteries.
Bad cells in battery.
L27GPP1_ALM
GEN PROTECTION MOD 1 125V
SUPPLY FAULT
Gen protection mod1 125v supply fault
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
ACTIONS TO BE TAKEN
Check battery charger AC breaker.
Check voltage magnitude.
Check the proper operation of the battery charger.
Check battery charger AC breaker.
Check voltage magnitude.
Check the proper operation of the battery charger.
Check bus PT fuses and wiring. Do not use auto
synchronizing or manual synchronizing until problem is
resolved.
Check relay 27B_1,2.
Check bus PT fuses and wiring. Do not use auto
synchronizing or manual synchronizing until problem is
resolved.
Check relay 27B_1,2.
Check bus PT fuses and wiring. Do not use auto
synchronizing or manual synchronizing until problem is
resolved.
Check relays 27B_1.
Check bus PT fuses and wiring. Do not use auto
synchronizing or manual synchronizing until problem is
resolved.
Check relays 27B_2.
Check bus PT fuses and wiring. Do not use auto
synchronizing or manual synchronizing until problem is
resolved.
Check relay 27B_1,2.
Check battery charger for proper operation, correct
excessive drain on battery, check for bad cells.
Check battery charger fuses.
NOTE:
The gas turbine should not be operated unless DC power
is available to the emergency DC lube oil pump.
Check power supply
Date : 10/2011
Page :7/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L27GPP2_ALM
L27GRDAC_ALM
L27GRDDC_ALM
ALARM TEXT
GEN PROTECTION MOD 2 125V
SUPPLY FAULT
GAS DETECT RACK 230 VAC POWER
SPPLY FLT
GAS DETECT RACK 125 VDC POWER
SPPLY FLT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
Gen protection mod2 125v supply fault
Check power supply
Gas detect rack 230 VAC power supply fault
Check power supply 230 VAC of gas detection module
Gas detect rack 125 VDC power supply fault
Check power supply 125 VDC of gas detection module
L27MC1AN_ALM
MCC UNDERVOLTAGE
Motor control center under-voltage.
L27MC1N_ALM
MCC UNDERVOLTAGE
Motor control center under-voltage.
L27MC2N_ALM
MCC UNDERVOLTAGE
Motor control center under-voltage.
L27N_ALM
NORMAL SUPPLY LOW VOLTAGE
Normal incoming under-voltage
L27QEL_ALM
DC MOTOR UNDERVOLTAGE (LUBE
OIL)
DC power not supplied to emergency DC pump.
125 VDC supply fault.
Pump fault
Breaker opens.
L27S_ALM
STAND BY SUPPLY LOW VOLTAGE
Emergency incoming under-voltage
L27TF_ALM
INLET FITER POWER SUPPLY FAULT The power supply of the inlet filter is faulty
G60A PROTECTION POWER SUPPLY
G60A protection power supply fault-trip
FAULT
L27X1_ALM
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Check that power is supplied to the motor control center.
Check 380 V on the bus bars.
Check breaker: transformer supply 16 KVA and the
transformer.
Check relay 27 MC.
Check that power is supplied to the motor control center.
Check 380 V on the bus bars.
Check breaker: transformer supply 16 KVA and the
transformer.
Check relay 27 MC.
Check that power is supplied to the motor control center.
Check 380 V on the bus bars.
Check breaker: transformer supply 16 KVA and the
transformer.
Check relay 27 MC.
Check Normal power supply 415 VAC at the Normal entry
of MCC
Check power to DC lube pump (MCC breaker on). Check
the fuses and the relay 27 QE.
Check the proper operation of pump motor.
Check the mechanical status of the pump.
NOTE:
The gas turbine should not be operated unless DC power
is available to the emergency DC lube pump.
Check Emergency power supply 415 VAC at the
Emergency entry of MCC
Check the power supply
Check power supply
Date : 10/2011
Page :8/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L27X2_ALM
L27X3_ALM
ALARM TEXT
POSSIBLES CAUSES
G60B PROTECTION POWER SUPPLY
G60B protection power supply fault-trip
FAULT
T60A PROTECTION POWER SUPPLY
T60A protection power supply fault-trip
FAULT
230VAC normal power supply fault #2
Check 230VAC normal power supply
230VAC UPS power supply fault #3
Check 230VAC UPS power supply
115VAC power supply fault #4
Check 115VAC power supply
One of the detectors operating when no flame is present or
flame detection before the firing sequence.
L28FD_SD
CHAMBER FLAMED OUT DURING
SHUTDOWN
Chamber flamed out during shutdown.
L28FDT_ALM
LOSS OF FLAME - TRIP
Failure of flame detectors or loss of flame.
START_UP FUEL FLOW EXCESSIVE
TRIP
On the liquid fuel circuit:
Fuel leakage.
Fuel loop system fault.
On the gas fuel circuit:
Purchaser gas supplies low pressure.
Loss of the pressure between VSR and VGC.
Gas leakage.
Transmitters fault.
L30AC_APU_AL
L30AC1_ALM
L30AC2_ALM
L30AC3_ALM
L30AC4_ALM
ATOMIZING AIR TEMPERATURE
FAULT
AIR PROCESSING UNIT FAULT
400VAC POWER SUPPLY FAULT #1
230VAC NORMAL POWER SUPPLY
FAULT #2
230VAC UPS POWER SUPPLY FAULT
#3
115VAC POWER SUPPLY FAULT #4
OMMO_5_9E_E0858_EN_V3
Check power supply
Atomizing air temperature fault.
Thermocouples fault.
Air processing unit problem
Power supply 400VAC fault
FLAME DETECTOR TROUBLE
L30AAT_ALM
Check power supply
Check for proper operation of the flame detection system.
Check that the flame detectors quartz windows are clean.
Repair or replace if necessary.
Check the fuel supply and the fuel control.
Check the fuel nozzles.
Check for following: fuel being supplied to the combustors,
flame in all chambers, damaged crossfire tubes, or
combustors.
Check for proper control valve position and fuel pressure.
Check for proper operation of the flame detectors 28 FD.
On the liquid fuel circuit:
Check for leakage.
Check tripping setting point.
Check fuel loop system operation.
Check the operation of the bypass versus the control
signal.
On the gas fuel circuit:
Check the purchaser gas supply.
Check the opening of the transmitters isolation valves.
Check the transmitters 96 FG_2A, 2B and 2C.
Check the LVDT setting value and the calibration of the
valve VSR.
Check the thermocouples AAT-1A and 2A. (Wiring,
connection, etc…).
Check air processing unit
Check 400VAC power supply
L28FD_ALM
L2SFT_ALM
ACTIONS TO BE TAKEN
All right reserved Copyright
Revision : A
Date : 10/2011
Page :9/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L30BT_ALM
TURBINE COMPARTMENT
VENTILATION FAULT
The turbine compartment ventilation is faulty.
L30BTA_ALM
BEARING METAL TEMPERATURE
HIGH
The temperature of the bearing metal is high.
L30BW_ALM
TURBINE COMPARTMENT VENT.
CHANGE OVER
WASHING SKID FAULT
Air fan changeover.
Turbine compartment air fan fault.
The washing skid is faulty.
L30CBC_ALM
COMP BLD VLV FAILURE TO OPEN
The compressor bleed valve failed to open.
L30BTX_ALM
ACTIONS TO BE TAKEN
Check the ventilation system of this compartment (power
supply, motors, fans, electrical circuit...).
Check the position of the vent flap.
Check the lube oil collector temperature.
Research the thermocouple, which occurred this alarm.
Check the indications of it.
Check the air fan system (power supply, motors, fans,
relay, electrical circuit...).
Check the washing skid.
Check the proper operation of the purge valve.
FIRE PROTECTION SYSTEM
TROUBLE
Fire protection system problem.
Check the power supply of fire protection system.
Check fire detectors and the electrical circuit. This trouble
must be corrected as soon as possible.
NOTE:
Before this search, the fire protection must be inhibited.
Do not forget to put again in service as soon as the
maintenance is finished.
Refer to specific chapters for more information about the
fire protection.
L30CD_ALM
COOLDOWN TROUBLE
Unit failed to go on cool-down, or the cool-down cycle was
aborted prior to cool-down timer timeout
Trouble during the cool-down sequence.
Turning gear motor fault.
Supply fault
Check the turning gear system.
Check the voltage supplies.
Check the proper operation of the turning gear motor
88TG.
L30COM_EXFLT
EXCITER TO MKVI COMMUNICATION
FAULT
Exciter to mkVI communication fault
Check power supply
L30CC_ALM
L30COMM_IO_R
L30D_CTRL_OT
L30DBEXX_ALM
VCMI IO STATE EXCHANGE FOR <R>
FAILED
CONTROLLER OVERTEMPERATURE
EXCITER FAIL - ABORTING DB
CLOSURE
OMMO_5_9E_E0858_EN_V3
Controller overtemperature
Check R controller is on
Check R controller is OK
Check the 3 IONet cables are OK
Check IONet cable is connected on the R controller VCMI
board
Refer to specific chapter.
Exciter fail - aborting db closure
Check exciter
No more communication with R controller
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Revision : A
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L30DC1_ALM
L30DPFLT_ALM
L30EX_FSP
L30EX_FTS
L30EX_RS
L30FAX_ALM
L30FAX1_ALM
L30FAX2_ALM
L30FC1_ALM
L30FC2_ALM
ALARM TEXT
125VDC POWER SUPPLY FAULT #1
ALARM
DEW POINT TEMPERATURE SENSOR
FAULT
EXCITER FAILURE TO STOP
EXCITER FAILURE TO START
EXCITER NOT READY TO START
CRUDE OIL FWD SMOKE INHIBITION
PUMP CHANGE OVER
HEAVY FUEL ADDITIVE PUMP #1
FAULT
HEAVY FUEL ADDITIVE PUMP #1
FAULT
COOLING WATER FAN 1 ELECTRICAL
TROUBLE
COOLING WATER FAN 2 ELECTRICAL
TROUBLE
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
115 VDC MCC voltage lost
Check 115 VDC MCC electrical circuit
Check voltage feeding
Dew point temperature sensor fault
Change dew point temperature sensor
Exciter failure to stop
Exciter failure to stop
Exciter not ready to start
Check exciter cubicle
Check exciter cubicle
Check the condition to start
For information
For information
Heavy Fuel Additive pump #1 fault
Check the pump # 1
Heavy Fuel Additive pump #2 fault
Check the pump # 2
The motor of the cooling water system fan #1 is faulty
The motor of the cooling water system fan #2 is faulty
L30FD_ALM
FAILURE TO IGNITE
Failure to fire within the one-minute period.
L30FDX1_ALM
L30FDX2_ALM
L30FORCED_ALM
FUEL FORWARDING PUMP #1 FAULT
FUEL FORWARDING PUMP #2 FAULT
FORCED LOGIC SIGNAL DETECTED
Fuel forwarding pump #1 fault
Fuel forwarding pump #2 fault
One alarm or more is forced
L30FPG2L_ALM
GAS FUEL INTERVALVE PRESSURE
(P2) LOW
The high line inter-valve ventilation is faulty.
Emergency motor fault
Power supply fault
L30FUX_ALM
CRUDE OIL FWD CRUDE OIL
FORWARDING PUMP FAULT
Pump, motor fault.
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Check electrical circuit
Check motor fan #1
Check electrical circuit
Check motor fan #2
Check that AC power is supplied to the ignition system.
Check the fuel supply.
Check if isolating valves on flame detectors are open.
Check the proper operation of spark plugs and flame
detectors.
Check. Fuel forwarding pump #1
Check. Fuel forwarding pump #2
Unforced all the alarms
Check gas compartment ventilation.
Check motors.
Check mechanical status of fans.
Check pressure switches.
Check the pump and corresponding motor
Check if the motor is supplied.
Check the pipes, valves, and filters, purge vents, leaks.
Check the pressure switches (operation and setting).
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L30FUX1_ALM
HEAVY FUEL FEEDING PUMP #1
FAULT
Motor fault
Power supply fault
Pump fault
Check the mechanical status of the motor and the pump
Check what the circuit is correctly positioned
Check the supply of the motor drawer and the motor
Check the fuses, breaker and the connection of the motor
See alarm : L30FUX1_ALM
See alarm : L30FUX1_ALM
L30G60A_ALM
L30G60B_ALM
HEAVY FUEL FEEDING PUMP #2
FAULT
GLOBAL ALARM FROM G60A
GLOBAL ALARM FROM G60B
Global alarm from G60A
Global alarm from G60B.
L30GGC_ALM
GEN COLD AIR TEMP FAULT
Generator RTD fault.
L30GGH_ALM
GEN HOT AIR TEMP FAULT
GAS DETECTION RACK SYSTEM
FAULT
GEN STATOR WINDING CENTER
TEMP SNSR FLT #10-11-12
GEN STATOR WINDING CENTER
TEMP SNSR FLT #1-2-3
GEN STATOR WINDING CENTER
TEMP SNSR FLT #4-5-6
GEN STATOR WINDING CENTER
TEMP SNSR FLT #7-8-9
HEAT VENT DLN COMPARTMENT
HEATER IN TROUBLE
HEAT VENT AUXILIARY
COMPARTMENT HEATER IN
TROUBLE
HEATER NOT DESIGNED TO RUN GT
ON - STOP HEATER
HEAT VENT LOAD COMPARTMENT
HEATER IN TROUBLE
HEAT VENT TURBINE
COMPARTMENT HEATER IN
TROUBLE
HEAT VENT WATER INJ COMP VENT.
ELECTRICAL FAULT
Generator temperature fault
Check G60A
Check G60B
Check RTD and associated connections for proper signal
and replace faulty RTD.
Check cooling and sealing system
Check the gas detection rack
Refer to the specific chapter about maintenance
Check RTD and associated connections for proper signal
and replace faulty RTD.
Check RTD and associated connections for proper signal
and replace faulty RTD.
Check RTD and associated connections for proper signal
and replace faulty RTD.
Check RTD and associated connections for proper signal
and replace faulty RTD.
L30FUX2_ALM
L30GRD_ALM
L30GSC10T12A
L30GSC1T3_AL
L30GSC4T6_AL
L30GSC7T9_AL
L30HA11X_ALM
L30HAX_ALM
L30HEATR_ALM
L30HG1X_ALM
L30HTX_ALM
L30JS_ALM
OMMO_5_9E_E0858_EN_V3
Gas detection rack system fault
Sensors fault detection
Sensors fault detection
Sensors fault detection
Sensors fault detection
Heat vent DLN compartment heater in trouble
Check heat vent DLN compartment heater
Heat vent auxiliary compartment heater in trouble
Check heat vent auxiliary compartment heater
Discrepancy between start order and feedback
Check feedback match with heater status
Heat vent load compartment heater in trouble.
Check the heater.
Heat vent turbine compartment heater in trouble
Check heat vent turbine compartment heater
Heat vent water injection compartment vent.
Check the heater.
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Revision : A
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L30JSX_ALM
HEAT VENT WI COMPARTMENT
VENT. CHANGE OVER
Air fan changeover.
Water injection compartment air fan fault.
L30LOAH_ALM
BEARING DRAIN TEMPERATURE
HIGH
Bearing fault.
Lube oil fault.
Lube oil cooling system fault.
Leakage.
Check the air fan system (power supply, motors, fans,
relay, electrical circuit...).
Check lube oil feed and drain piping
Check bearings and lube oil system.
Check thermocouples.
Check lube oil cooling.
Check the correct circulation of the lube oil.
Check for leakage.
L30LSI_ALM
BEARING DRAIN TEMPERATURE
HIGH
AIRCRAFT WARNING LIGHT ALARM
L30LTA
LOAD TUNNEL TEMPERATURE HIGH
L30LTTH_ALM
LUBE OIL THERMOCOUPLE FAULT
SYNC INHIBITED-MAN (FVR) REG
ACTIVE
L30LOAHH_ALM
L30MRSYNC_AL
OMMO_5_9E_E0858_EN_V3
See alarm : L30LOAH_ALM
See alarm : L30LOAH_ALM
Aircraft warning ligh alarm
Thermocouple fault
For information
Check the proper operation of ventilation system.
Check the operation of the ventilators (rotation).
Check the operation of the motors 88 TK1 and 2.
Check the thermocouple TT_IB_1 (connection, shortcircuit, cut off, position).
Check the sealing and the cleanliness of the pipes.
Check the proper operation of thermocouples LTTH1 to 3.
Sync inhibited man (FVR) reg active.
For information
Automatic shutdown.
Ventilation system fault.
Thermocouple fault.
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Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
L30PPDA_125P_ALM
PPDA 125V PBUS FEED FAULT
L30PPDA_AC_IN_1_ALM
L30PPDA_AC_IN_2_ALM
PPDA AC INPUT 1 FAULT
PPDA AC INPUT 2 FAULT
PPDA/JPDD 125V POWER FEED
FAULT
PPDA <R> PBUS NOT REGULATING
PPDA <S> PBUS NOT REGULATING
PPDA <T> PBUS NOT REGULATING
PPDA <R> PBUS SOURCE FAULT
PPDA <S> PBUS SOURCE FAULT
PPDA <T> PBUS SOURCE FAULT
L30PPDA_JPDD_125V_ALM
L30PPDA_PBUS_R_ALM
L30PPDA_PBUS_S_ALM
L30PPDA_PBUS_T_ALM
L30PPDA_SRC_R_ALM
L30PPDA_SRC_S_ALM
L30PPDA_SRC_T_ALM
POSSIBLES CAUSES
Voltage failure
Fuse fault
Wrong barcode in software
Wrong firmware loaded in IO pack
IO pack Ethernet link or power supply disconnected
Check alarm number in GEH-6721 vol II
Check board power supply is correctly connected, else
connect it.
Check IO pack Ethernet link or power supply is correctly
connected (Leds on IO pack must be active), else connect
it.
Check IR port of the IO pack is protected by its metallic
plate, else turn the plate until IR port is hidden.
Check barcode is identical on board and inside IO
hardware configuration in the software, else change
barcode number, build and download.
Check firmware is correct in the IO pack, else download
again the firmware with actual ToolbowST release.
Check electrical cables are not cut, else replace cables.
Check fuse have not melt, if yes, replace fuse.
Check voltage is present, if not, re start power supply.
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
See : L30PPDA_125P_ALM
Check the generator bearing system (power supply,
pumps, electrical circuit...).
Check the pressure switch.
Check the relay 51 QV.
Check the motor 88 QV (proper operation).
Check the density analyzer.
L30QB1_ALM
GENERATOR BRG LIFT PUMPS
ELECTRICAL FAULT
The lift pumps are faulty
L30QV_ALM
OIL MIST ELIMINATOR FAULT
The oil mist separator fan motor is in trouble.
L30SG1_ALM
DENSITY ANALYSER FAULT 1
The density analyzer is faulty.
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
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Revision : A
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L30SPA
COMBUSTION TROUBLE
Faulty thermocouples, gas path hardware or uneven
distribution of fuel to the fuel nozzles.
L30SPT
HIGH EXHAUST TEMP. SPREAD TRIP
Faulty thermocouples, gas path parts or uneven distribution
of fuel to the fuel nozzles.
L30SPTA
L30T60A_ALM
L30TWW_ALM
L30TXA_ALM
L30TXAH1
L30UPSCS_ALM
L30UPSMAJ_AL
L30UPSMIN_AL
L30UPSMOD_AL
EXHAUST THERMOCOUPLE
TROUBLE
T60A GLOBAL A
WATER WASH
INHIBIT_WHEELSPACE TEMP. HIGH
EXHAUST TEMPERATURE HIGH
FIRST FAILED HIGH EXHAUST
THERMOCOUPLE
BATTERY CHARGER - CS FAULT
INVERTER MAJOR UPS FAULT
INVERTER MINOR GROUP FAULT
INVERTER MODULE GROUP FAULT
Faulty thermocouple.
T60A global alarm
The washing procedure is inhibited because the wheelspace temperature is too high.
Thermocouples fault.
The exhaust gas temperature is excessive.
Thermocouples fault.
Fuel control system fault.
Ventilation system fault.
Analyze data for trends. At earliest shutdown, check
thermocouples.
Perform bore scope or combustion inspection.
Check flow divider, fuel pressures.
Check for plugged nozzles.
Analyze data for trends. Perform bore scope or
combustion inspection.
Check flow divider, fuel pressures.
Check for plugged nozzles.
Check thermocouples and wiring.
Change if necessary.
Check T60A
Check the temperature and wait for an adequate wheelspace temperature.
Check the thermocouples.
Check all thermocouples. Replace any bad
thermocouples.
If problem is not thermocouples, isolate portion of control
system causing problem.
Check the temperature control loop and the fuel control
system.
See alarm : L30TXA_ALM
See alarm : L30TXA_ALM
Inverter static converter group fault
MCC UPS major fault
Inverter minor group fault
Inverter module group fault
Check inverter static converter group
Check MCC UPS
Check inverter minor group
Check inverter module group fault
Check the ventilation system of this compartment (power
supply, motor, fans, electrical circuit...).
Check the pressure switch.
Check the position of vent flap.
L30VG_ALM
LOAD COMPT COOLING FAN
CHANGE OVER
The load compartment ventilation is faulty.
L30VGX_ALM
LOAD COMPARTMENT VENTILATION
FAULT
See alarm : L30VG_ALM
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
All right reserved Copyright
Revision : A
See alarm : L30VG_ALM
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L30VL_ALM
GAS CABINET _ EMERGENCY FAN
‘’ON’’
Fan fault: changeover to emergency fan.
Motor fault.
Pressure switch fault.
L30VLX_ALM
GAS COMPARTMENT VENTILATION
FAULT
The gas compartment ventilation is faulty.
L30WCX_ALM
COOLING WATER PUMP FAULT
(CHANGEOVER)
Motor fault
Power supply fault
Pump fault
L30WCX1_ALM
L30WCX2_ALM
COOLING WATER MOTOR # 1 FAULT
COOLING WATER MOTOR # 2 FAULT
L30WN_ALM
WATER INJECTION NOT SELECTED
L30WN1_ALM
WATER INJECTION PUMP
ELECTRICAL FAULT
L30WQER_ALM
L30WR1X_ALM
L30WSA1_ALM
WATER INJ SERVO NOT FOLLOWING
OUTPUT
HEAT VENT WI COMPARTMENT
HEATER IN TROUBLE
WHEELSPACE TEMP. DIFFERENTIAL
HIGH
L30WSA2_ALM
WHEELSPACE TEMPERATURE HIGH
L32DW_ALM
GENERATOR BREAKER
TRIP_REVERSE POWER
OMMO_5_9E_E0858_EN_V3
See alarm : L30WCX_ALM
See alarm : L30WCX_ALM
Water injection not selected.
Water injection has been deselected.
Power supply fault
Pump fault
Difference between the flow measured and the flow wanted
ACTIONS TO BE TAKEN
Check the gas skid ventilation system (motors, fans,
power supply, etc.)
Check the power supply of the motor 88 VL and its
protections.
Check the pressure switch 63 VL.
Check gas compartment ventilation.
Check motors, 88 VL _ 1,2.
Check mechanical status of fans.
Check pressure switches 63 VL _ 1,2.
Check the mechanical status of the motor and the pump
Check what the circuit is correctly positioned
Check the supply of the motor drawer and the motor
Check the fuses, breaker and the connection of the motor
See alarm : L30WCX_ALM
See alarm : L30WCX_ALM
Research the cause of the injection deselecting.
Check the mechanical status of the pump
Check the supply of the pump
Check the fuses, breaker and the connection of the pump
Check the injection circuit to see why the measured flow is
lower than the constant flow
Heat vent WI compartment heater in trouble
Check heat vent WI compartment heater
Excessive differential between wheel-space thermocouples.
Defect thermocouples (TTWS_XX).
Thermocouples position fault.
Combustion fault.
Check thermocouples for shorts, grounds or opens.
Replace failures. If condition persists investigate for seal
failure.
Check the thermocouples position.
Check the combustion and regulation system.
High wheel-space temperature (for proper value refer to
control specification).
Ventilation system fault.
Thermocouples fault (TTWS_XX).
Turbine fault.
Fuel feeding system fault.
All right reserved Copyright
Revision : A
Check thermocouples, investigate for seal failure.
Check the ventilation system.
Check the proper operation of the thermocouples.
Turbine checking.
Fuel feeding system checking (skid fuel).
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L33ARS_ALM
AC TRANSFER CB SPRING CHARGE
FAILURE
AC transfer cb spring charge failure
Check circuit breakers 52AR & 52AS
L33BT_ALM
TURBINE COMPARTMENT VENT.
FLAP CLOSED
Flap closed in the turbine compartment.
Limit switch fault.
L33CDMN_ALM
AT MIN TNR-REVERSE POWER NOT
DETECTED
Transducer fault
System of detection fault
Check the position of flap.
Determine the cause of the flap closing.
Check the limit switch 33 BT.
Check the proper operation of the generator watts
transducer and open the manually breaker if necessary
Check the logic of command
L33CL1_ALM
CO2 LOCK OFF IN ZONE 1
CO2 emission
L33CL2_ALM
CO2 LOCK OFF IN ZONE 2
FIRE PROTECTION DLN COMPT CO2
LOCKED ALARM
HEAT VENT AUXILIARY
COMPARTMENT DOOR OPEN
CO2 emission
Refer to fire protection panel to determinate the fire zone.
The unit should not be operated until the cause has been
determined and corrected and the fire protection has been
re-established in its normal condition (refilling of CO2
bottles, circuit reset...).
Check for the causes of this trip; hot air or fuel or oil leaks,
or short-circuits.
NOTE:
Restarting after an operation of the CO2 system requires
that the CO2 system be reset, including all doors and
dampers, and the CO2 release mechanism.
WARNING:
Carbon Dioxide, in a concentration sufficient to extinguish
fire, creates an atmosphere that will not support life. It is
extremely hazardous to enter the compartment after the
CO2 system has been discharged. For further information,
refer to Fire Protection System documentation if available.
The extent and type of safeguards and personnel warning
that may be necessary must be designed to meet the
particular requirements of each situation. It is
recommended that personnel be adequately trained as to
the proper action to take in case of such an emergency.
See alarm : L33CL1_ALM
CO2 emission
See alarm : L33CL1_ALM
The door of the compartment auxiliary is open.
Limit switch fault.
Check the air inlet filter system.
Check the limit switch 33 DT1.
L33CL4_ALM
L33DT1_ALM
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L33DT2_ALM
L33DT3_ALM
L33JS_ALM
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
HEAT VENT AUXILIARY
COMPARTMENT DOOR OPEN
HEAT VENT AUXILIARY
COMPARTMENT DOOR OPEN
WATER INJECT COMP FLAP DAMPER
NOT CLOSED
The door of the compartment auxiliary is open.
Limit switch fault.
The door of the compartment auxiliary is open.
Limit switch fault.
Check the air inlet filter system.
Check the limit switch 33 DT2.
Check the air inlet filter system.
Check the limit switch 33 DT3.
Water inject comp flap damper not closed.
Check damper
L33PGC_ALM
PRIMARY PURGE VALVES FAILURE
TO CLOSE
Either one or both of purge valves VA13_1and VA13_2 not
functioning correctly.
Either one or both of limit switches 33PG_1 and 33PG3 not
functioning correctly.
L33PGO_ALM
GAS FUEL NOZ. PURGE VALVE FAIL
TO OPEN
The purge valves VA 13_1 and VA 13_2 failed to open.
L33PLP_ALM
PRIMARY LIQUID FUEL LOW PURGE
FAULT
L33PS1C_ALM
VENT VALVE FSV452 NOT CLOSED
L33PS2O_ALM
VENT VALVE LIMIT SWITCH NOT
OPEN
L33PSC_ALM
L33PSO_ALM
L33S_ALM
GENERATOR HOT GAS
TEMPERATURE HIGH
GAS FUEL VENT VALVE OPEN
TROUBLE
AUTOMATIC VALVES FAULT
OMMO_5_9E_E0858_EN_V3
No detection of opening on liquid fuel purge system when
purge is requested
This alarm indicates the wrong position of the vent valve:
The valve is blocked
Valve fault
Limit switch fault
This alarm indicates the wrong position of the vent valve:
The valve is blocked
Valve fault
Limit switch fault
Check the proper operation of:
_ Purge valves VA13_1 and VA13_2
_ Air valves VA36_1 and VA36_2
_ Solenoid valves 20PG_1 and 20PG_2.
Check Speedtronic connections and interface.
Check the limit switches 33PG_1 and 33PG_3 for set
point and Speedtronic connections.
Check the proper operation of the purge valves VA 13_1
and VA 13_2.
Check the status of the solenoid valves 20 PG_1 and
20 PG_2.
Check the proper operation of the limit switches 33 PG_2
and 33 PG_4.
Control liquid fuel purge valve position (hi flow valve)
Check that noting is blocking the valve
Check the limit switch
Check the valve
Check that noting is blocking the valve
Check the limit switch
Check the valve
Generator hot gas temperature high
Refer to specific chapter
Gas Fuel Vent Valve Open position trouble
Check limit switch and valve
Automatic valves fault
Check valve
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Date : 10/2011
Page :18/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L33VG_ALM
LOAD COOLING AIR FLAT DAMPER
NOT CLOSED
Damper not closed
Limit switch fault
L33VG11_ALM
TURBINE GAS VENT VALVE
POSITION FAULT
Turbine gas vent valve position fault.
Limit switch fault.
L33VL_ALM
HEAT VENT GAS/DLN COMPT VENT
FLAP NOT CLOSED
Compartment flap damper not closed
Limit switch fault
Valve position fault
Limit switch fault
Valve position fault
Limit switch fault
Valve position fault
Limit switch fault
Valve position fault
Limit switch fault
Something is blocking the valve
Check what is blocking the valve and remove it
L33WNO_ALM
GAS FUEL SHUT OFF VALVE LIMIT
SWITCH NOT CLOSED
GAS FUEL SHUT OFF VALVE
CLOSED TROUBLE
GAS FUEL SHUT OFF VALVE LIMIT
SWITCH NOT OPEN
GAS FUEL SHUT OFF VALVE OPEN
TROUBLE
H2O INJ CTRL & XFER VLV FAIL TO
CLOSE
WATER INJECTION TROUBLE
Check the position of the damper
Determine the cause of the flap opening
Check the limit switch 33VG
Check the proper operation of vent valve 20 VG-1.
Check the limit switch 33VG
Check the position of the damper
Determine the cause of the flap opening
Check the limit switch
Check valve 20VS position
Check limit switch 33VS4
Check valve 20VS position
Check limit switch 33VS4
Check valve 20VS position
Check limit switch 33VS4
Check valve 20VS position
Check limit switch 33VS4
There is a problem in the injection circuit
L39VA_ALM
HIGH VIBRATION ALARM
Vibration at one or more bearings.
Check the injection circuit
Monitor vibration readings.
Determine the cause of this trouble and repair.
L39VD1_ALM
VIBRATION BN GT. AXIAL SHAFT
DISPLACEMENT ALERT
VIBRATION BN GT. AXIAL SHAFT
DISPLACEMENT DANGER
VIBRATION SENSOR DISABLED
L39VD3_ALM
VIBRATION _ START INHIBIT
GT axial shat displacement alert
st
1 step
GT axial shat displacement alert
2nd step
Signal from vibration sensors is faulty.
Start inhibited.
Vibration protection system problem.
Too many sensors in trouble or disabled.
L39VDIFF_ALM
VIBRATION DIFFERENTIAL TROUBLE
L33VS411C_AL
L33VS411CX_A
L33VS421O_AL
L33VS421OX_A
L33WNC_ALM
L39VCA_ALM
L39VCD_ALM
OMMO_5_9E_E0858_EN_V3
Vibration protection system problem.
All right reserved Copyright
Revision : A
ACTIONS TO BE TAKEN
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration protection system.
Check the vibration sensors.
Check vibration protection system.
Check the level of each sensor and determine the cause
of the differential.
Date : 10/2011
Page :19/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
VIBRATION TRANSDUCER FAULT
Vibration detector impedance is not within normal bounds or
3 or more gas turbine sensors are disabled or faulty.
Check impedance or each vibration detector (open or
short-circuit).
Check the vibration protection system.
NOTE:
With the 3 or more sensors disabled or faulty, the start is
inhibited.
VIB BN GEN BRG #2 RADIAL SHAFT
DISPLACEMENT ALERT
VIB BN GEN BRG #2 RADIAL SHAFT
DISPLACEMENT DANGER
VIB BN GT BRG #1 RADIAL SHAFT
DISPLACEMENT ALERT
VIB BN GT BRG #1 RADIAL SHAFT
DISPLACEMENT DANGER
VIB BN GT BRG #2 RADIAL SHAFT
DISPLACEMENT ALERT
VIB BN GT BRG #2 RADIAL SHAFT
DISPLACEMENT DANGER
VIB BN GT BRG #3 RADIAL SHAFT
DISPLACEMENT ALERT
VIB BN GT BRG #3 RADIAL SHAFT
DISPLACEMENT DANGER
VIB BN GEN BRG #1 RADIAL SHAFT
DISPLACEMENT ALERT
VIB BN GEN BRG #1 RADIAL SHAFT
DISPLACEMENT DANGER
Generator bearing 2 radial shat displacement alert
1st step
Generator bearing 2 radial shat displacement alert
2nd step
GT bearing 1 radial shat displacement alert
st
1 step
GT bearing 1 radial shat displacement alert
2nd step
GT bearing 2 radial shat displacement alert
st
1 step
GT bearing 2 radial shat displacement danger
2nd step
GT bearing 3 radial shat displacement alert
1st step
GT bearing 3 radial shat displacement alert
2nd step
GT bearing 1 radial shat displacement alert
st
1 step
GT bearing 1 radial shat displacement alert
2nd step
L39VSD_ALM
HIGH VIBRATION SHUTDOWN
High vibration
L39VT_ALM
HIGH VIBRATION TRIP
High vibration
L39VF_ALM
L39VS10A_ALM
L39VS10D_ALM
L39VS1A_ALM
L39VS1D_ALM
L39VS2A_ALM
L39VS2D_ALM
L39VS3A_ALM
L39VS3D_ALM
L39VS9A_ALM
L39VS9D_ALM
ALARM TEXT
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check vibration sensors and wiring.
Check for mechanical failures, observe vibration level
Determine the cause of this trouble and repair
Check the vibration sensor
Check for mechanical failures, observe vibration level
Determine the cause of this trouble and repair
Check the vibration sensor
Date : 10/2011
Page :20/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
The turbine gas is not on Total liquid or total gas
Reduce the load that will be applied to the generator
before closing again the generator breaker (network
problems).
Check the proper operation of the speed relay 14 HS
circuit logic.
Check fuel system
AFPAT sensor fault
Change AFPAT sensor
Customer damper not in correct status to start GT.
Check damper position
AFPCS sensor fault
Change sensor
Both hydraulic pumps locked out
Refer to specific chapter
Bad signal from load control transducer.
Check the transducer 96 GG (setting point, power supply,
link).
L3FS1C_T_ALM
SHUT OFF VALVE SWITCH FAIL TO
CLOSED
This alarm indicates the wrong position of the shut off valve:
The valve is blocked
Valve fault
Limit switch fault
Check that noting is blocking the valve
Check the limit switch
Check the valve
L3FTGL_ALM
GAS FUEL TEMPERATURE LOW RECYCLING
Trip unit.
Gas fuel temperature very is low.
L3FTGLT_ALM
GAS FUEL TEMPERATURE GAS TOO
LOW
Gas temperature low.
L3FTGLZ_ALM
GAS FUEL TEMPERATURE LOW
AFTER RECIRCULATION
Gas fuel temperature low after re-circulation
Check cooling and sealing system
The transfer to heavy fuel is not authorized, because the
temperature or pressure of the heavy fuel is not correct.
Check the forwarding heavy fuel system and the heater
system (if used).
Check the inhibitor system.
Check the temperature switch 26 FU_2, 26 FL_2 and
pressure switch 63 FU_2 and 63 AD_1.
L3A_ALM
TURBINE UNDERSPEED
l3ACS_ALM
SERVOS CHECK FAULT TRIP
AMBIENT PRESSURE
MEASUREMENT FAULT
DAMPER CUSTOMER START INHIBIT
INLET PRESSURE MEASUREMENT
FAULT
BOTH HYDRAULIC PUMPS LOCKED
OUT
LOSS OF EXTERNAL SETPOINT
LOAD SIGNAL
L3APFLT_ALM
L3CP_ALM
L3CPRI_ALM
L3DWBCOKZ_AL
L3DWRF
L3FUZ_ALM
HEAVY FUEL TRANSFER
PERMISSIVE TROUBLE
OMMO_5_9E_E0858_EN_V3
The turbine speed is too low (< 95%) when complete
sequence is reached (L3) (end of starting sequence).
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Revision : A
Check the proper operation of the temperature switch
FTG.
Check the gas skid (motor, fan, circuit, etc…)
Check the gas heating system.
Check the proper operation of the temperature switch 26
GL.
Date : 10/2011
Page :21/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
L3GCVA_ALM
GAS CONTROL VLV NOT
FOLLOWING - ALARM
L3GCVFLT_ALM
GAS CONTROL VALVE SERVO
TROUBLE
L3GLTSDTC_AL
L3GLTSUTC_AL
L3GRVA_ALM
SHUT DOWN GAS LEAK TEST
COMPLETE
START UP GAS LEAK TEST
COMPLETE
STOP/SPEED RATIO VLV NOT
TRACKING ALARM
L3GRVFLT
GAS RATIO VALVE POSITION SERVO
TROUBLE
L3GRVT_ALM
STOP/SPEED RATIO VLV NOT
TRACKING TRIP
L3IGVFLT_ALM
INLET GUIDE VANE POSITION
SERVO_TROUBLE
OMMO_5_9E_E0858_EN_V3
POSSIBLES CAUSES
Start inhibited + transfer to fuel if running on gas or transfer
to gas inhibited.
The gas control valve feedback is abnormal.
Supply fault.
Sensors defected.
Valve and servo-valve fault.
Start inhibited + transfer to fuel if running on gas or transfer
to gas inhibited.
The gas control valve feedback is abnormal.
Supply fault.
Sensors defected.
Valve and servo-valve fault.
ACTIONS TO BE TAKEN
Check LVDT, 96 GC_1, 2 (setting value, wiring).
Check the calibration of the VGC.
Check the proper operation of the servo-valve 65 GC_1.
Check LVDT, 96 GC_1, 2 (setting value, wiring).
Check the calibration of the VGC.
Check the proper operation of the servo-valve 65 GC_1.
Shut down gas leak test complete.
No action
Start up gas leak test complete
No action
Valve position fault
LVDT fault
Start inhibited + transfer to fuel if running on gas or transfer
to gas inhibited.
The gas ratio valve feedback signal is abnormal.
Supply fault.
Sensors defected.
Valve and servo-valve fault.
Valve position fault
LVDT fault
Check valve position
Check LVDT
Loss of feedback.
At start-up, the inlet guide vanes are not closed.
At normal speed, the inlet guide vanes are closed.
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Revision : A
Check LVDT, 96 SR (setting value, wiring).
Check the calibration of the VSR.
Check the proper operation of the servo-valve 90 SR.
Check valve position
Check LVDT
Determine the cause and correct before restarting.
The master reset must be initiated before starting.
Check the proper operation of the solenoid valve 20 TV_1
and the control system of the jack.
Check the setting values of the LVDT 96 TV_1 and 2.
Refer to the control specification.
Check logic circuit.
Date : 10/2011
Page :22/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L3LFLT_ALM
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
LIQUID FUEL CONTROL FAULT
Liquid fuel check system has detected an abnormal servo or
LVDT position or signal.
HP oil fault.
Mechanical problem on the bypass.
Check the fuel pressure before the nozzles.
Check for the fuel leakage.
Check the HP oil pressure and check for leakage.
Check if the bypass is not clamped.
Check the different devices (setting point, calibration).
Check the regulation system.
L3SFLT_ALM
Start inhibited.
Lube oil heaters fault (23 QT_1 to 6).
LUBE OIL TANK TEMERATURE FAULT
Lube oil pump in trouble (88QA_2).
Loss of AC.
MASTER PROTECTIVE START
Turbine not ready to start
CHECK ETR FAULT
EXHAUST TC VTCC
See : L3PTCC_1J1A_FLT
COMMUNICATIONS FAULT
CONTROL SYSTEM FAULT TRIP
Control system fault
L3SMT_ALM
STARTING DEVICE TRIP.
L3TFLT_ALM
LOSS OF COMPRESSOR DISCHARGE
Bad signal from compressor pressure transmitter (96 CD).
PRESSURE BIAS
L3TMFLT1_ALM
TORQUE CONVERTER GV TROUBLE
L3LTOT_ALM
L3MP_ALM
L3PTCC_ALM
L3TNRERRX
L3VLST_ALM
L3WCTIM_ALM
DWATT TOO LOW TO SUPPORT
TNR_TNR LOWER
HEAT VENT GAS PRESS ULTRA LOW
DOWNSTREAM SSOV
ON_LINE WATER WASH INHIBITED
OMMO_5_9E_E0858_EN_V3
Failure of cranking motor to start.
The torque converter guide vane position transducer is
damaged or disconnected.
Dwatt too low to support tnr_tnr lower
Check the lube oil heaters (23 QT to 6).
Check the lube oil circuit.
Check the AC supply (415 VAC).
Check start check screen on the HMI
See : L3PTCC_1J1A_FLT
Check control system
Check the cranking motor cell, the breaker and the
electrical motor.
Identify the faulty circuit and repair.
CAUTION:
Take the safety recommendation for working on medium
voltage.
Check the transmitters and associated connections.
Check the associated connections for proper bias signal.
Check the pressure.
Check the transducer.
Verify the adjustment.
Do not restart the unit before it is done.
Check fuel supply
Check FSR limitation
Gas feeding pressure low
Check the feeding of gas fuel
The ‘’On-line’’ water wash is inhibited because the
compressor inlet temperature is low.
To continue the water wash sequence, select in the
SPEEDTRONIC MARK V the ‘’Inlet air heating’’ circuit.
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Revision : A
Date : 10/2011
Page :23/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L3WWTDZ_ALM
FALSE START DRAIN TC DIFF HIGH
Spread between the
Two TC’s,
TC disconnected or broken.
Check TC and connection.
Repair wiring or replace TC if found damaged.
L3Z_ALM
FAILURE TO SYNCHRONIZE
Unit did not synchronize and close generator breaker within
the normal expected time.
L43ADJ_ALM
VSVO IN CALIBRATION MODE
VSVO in calibration mode
L43CR_ALM
L43EX_ALM
L43FL_T_ALM
L43MAINT_ALM
L45FP1_ALM
L45FP2_ALM
L45FP4_ALM
L45FPX_ALM
L45FTX1_ALM
L45FTX2_ALM
L45FTX4_ALM
STARTING MEANS CRANKING
MOTOR REMOTE POSITION
EX2K MANUAL (FVR) REGULATOR
ACTIVE
TRANSFER TO LIQUID FUEL FAIL TRIP
MAINTENANCE _ FORCING MODE
ENABLED
FIRE PRE-ALARM IN ZONE 1
FIRE PRE-ALARM IN ZONE 2
FIRE PREALARM ZONE #4 ALARM
FIRE PROTECTION - GENERAL FIRE
ALARM ZONE 1 & 2
FIRE IN ZONE #1
FIRE IN ZONE #2
FIRE ALARM ZONE #4 ALARM
OMMO_5_9E_E0858_EN_V3
Investigate synchronization system to determine exact
cause of problem.
Check the stability of the turbine speed control.
Finish calibration
Set off calibration mode
Starting motor remote selected
No action
EX2K manual (FVR) regulator active
No action
Transfer to liquid fail
Transfer during more than 2 minutes
Auto calibrate, memory changing or logic forcing mode of
operation has been selected.
Fire detection in compartment # 1
Fire detection in compartment # 2
Fire detection in compartment # 4
Check liquid fuel system
When done with the operation, deselect the operation.
See alarm : L33CL1_ALM
See alarm : L33CL1_ALM
See alarm : L33CL1_ALM
Fire detection in compartment # 1
See alarm : L33CL1_ALM
Fire in zone #1
Fire in zone #2
Fire is detected in Җ4 zone.
See alarm : L33CL1_ALM
See alarm : L33CL1_ALM
See alarm : L33CL1_ALM
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Revision : A
Date : 10/2011
Page :24/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L45HA4_ALM
L45HA4H_ALM
L45HA4HH_ALM
L45HA4T_ALM
ALARM TEXT
HZD GAS DETEC
DLN/AUX COMPT CARD FAULT OF
SET 4
HZD GAS DETEC
DLN COMP-DLN
VENT/GAS CAB HIGH LEVEL
HZD GAS DETEC
DLN /AUX COMPT#4
VENT/GAS CAB HIGH HIGH LEVEL
HZD GAS DETEC HIGH HIGH LEVEL
INFORMATION
OMMO_5_9E_E0858_EN_V3
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
A leak of gas is detected in the DLN compartment.
Gas leak detection alarm may be generated either by gas
detection loop fault or by a real gas leak.
Refer to Gas detection control system cabinet and
relevant component literature for detailed fault analysis.
Gas leak detection alarm must be considered as high
priority. Continued operation of the turbine is not
recommended. Proceed to normal shutdown to avoid later
trip by higher detection level.
For dual fuel machine, do not transfer to liquid fuel. This
will not eliminate the leak if situated downstream the gas
control
valves. The leak shall remain at the same place with other
fluid (e.g. purging air).
Do not open the door of the enclosure, keep the area
around free of people.
Access to enclosure is only permitted when the main gas
valve is closed and the line depressurised, the unit is
stopped, on cooling sequence by ratchet system (Frame
6000B) or by barring system (Other Frame) with issuing of
the relevant access permit or permit to work.
Visual check the flanges (Refer to Residual risks
summary/Maintenance phase) and the flexible metal
hoses (Refer to GEK 111694) and all other connections.
Pressurise the length/section of pipe according to End
User procedure and appropriate precautions. It may be
worth to use portable gas detectors and/or leak detection
liquids or spray to find what caused the alarm.
Repair the leak and reset the alarm after investigation.
A leak of gas is detected in the DLN compartment.
See alarm : L45HA4_ALM
A leak of gas is detected in the DLN/auxiliaries
compartment. #4
See alarm : L45HA4_ALM
A leak of gas is detected in the ventilation compartment
See alarm : L45HA4_ALM
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Revision : A
Date : 10/2011
Page :25/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L45HA5_ALM
L45HA5HH_ALM
L45HA6_ALM
L45HA6HH_ALM
L45HGD_PRETA
L45HGDHH_ALM
L45HGDSD_ALM
ALARM TEXT
HZD GAS DETEC
DLN/AUX COMPT CARD FAULT OF
SET 5
HZD GAS DETEC
DLN /AUX COMPT#5
VENT/GAS CAB HIGH HIGH LEVEL
HZD GAS DETEC
DLN/AUX COMPT CARD FAULT OF
SET 6
HZD GAS DETEC
DLN /AUX COMPT#6
VENT/GAS CAB HIGH HIGH LEVEL
START INHIBITED DUE TO GAS
DETECTION FIRST LEVEL
HZD GAS DETEC HIGH HIGH LEVEL
INFORMATION
HAZARDOUS GAS DETECTION
FAILURE - SHUT DOWN
OMMO_5_9E_E0858_EN_V3
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
A leak of gas is detected in the DLN compartment.
See alarm : L45HA4_ALM
A leak of gas is detected in the DLN/auxiliaries
compartment. #5
See alarm : L45HA4_ALM
A leak of gas is detected in the DLN compartment.
See alarm : L45HA4_ALM
A leak of gas is detected in the DLN/auxiliaries
compartment. #6
See alarm : L45HA4_ALM
A leak of gas is detected in the ventilation compartment
Check where the gas is detected
An alarm indicate witch compartment is concern
See alarm : L45HA4_ALM
A leak of gas is detected in the ventilation compartment
See alarm : L45HA4_ALM
Start inhibited
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Revision : A
Date : 10/2011
Page :26/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L45HT1_ALM
L45HT1H_ALM
L45HT1HH_ALM
L45HT1T_ALM
L45HT2_ALM
ALARM TEXT
TURB COMPARTMENT GAS LEVEL
HIGH-ALM
TURBINE & EXTRACT DUCT COMB
GAS LEVEL HIGH'
HZD GAS DETEC
TURBINE COMPT#1
HIGH HIGH LEVEL
TURB COMPARTMENT LEVEL VERY
HIGH-TRIP
GT VENTILATION DUCT GAS LEVEL
HIGH-ALM
OMMO_5_9E_E0858_EN_V3
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
Gas level high detected in the turbine compartment.
Gas leak detection alarm may be generated either by gas
detection loop fault or by a real gas leak.
Refer to Gas detection control system cabinet and
relevant component literature for detailed fault analysis.
Gas leak detection alarm must be considered as high
priority. Continued operation of the turbine is not
recommended. Proceed to normal shutdown to avoid later
trip by higher detection level.
For dual fuel machine, do not transfer to liquid fuel. This
will not eliminate the leak. The leak shall remain at the
same place with other fluid (e.g. purging air).
Do not open the door of the enclosure, keep the area
around free of people.
Access to enclosure is only permitted when the unit is
stopped, on cooling sequence by ratchet system (Frame
6000B) or by barring system (Other Frame) with issuing of
the relevant access permit or permit to work.
Visual check the flanges (Refer to Residual risks
summary/Maintenance phase) and the flexible metal
hoses (Refer to GEK 111694).
Pressurise the length/section of pipe according to End
User procedure and appropriate precautions. It may be
worth using portable gas detectors and/or leak detection
liquids or spray to find what caused the alarm.
Repair the leak and reset the alarm after investigation.
Turbine compartment level very high.
Check the gas sensors 45 HT-1HH, 2HH and 3-HH
A leak of gas is detected in the turbine compartment. #6
See alarm : L45HT1_ALM
Turbine compartment level very high.
Check for leakage in the gas turbine compartment.
Check the gas sensors 45 HT-1HH, 2HH and 3-HH.
Gas level high detected in the GT ventilation duct.
See alarm : L45HT1_ALM
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Revision : A
Date : 10/2011
Page :27/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L45HT2HH_ALM
L45HT3_ALM
L45HT3HH_ALM
L45HT4_ALM
L45HT4H_ALM
L45HT4HH_ALM
L45HT4T_ALM
L45HT5_ALM
L45HT5HH_ALM
L45HT6_ALM
L45HT6HH_ALM
ALARM TEXT
HZD GAS DETEC
TURBINE COMPT#2
HIGH HIGH LEVEL
HZD GAS DETEC
TURBINE COMPT CARD FAULT OF
SET 3
HZD GAS DETEC
TURBINE COMPT#3
HIGH HIGH LEVEL
HZD GAS DETEC
TURBINE COMPT CARD FAULT OF
SET 4
HZD GAS DETEC
TURBINE COMPT VENT DUCT HIGH
LEVEL
HZD GAS DETEC
TURBINE COMPT#4
HIGH HIGH LEVEL
HZD GAS DETEC TURBINE COMPTVENTILATION DUCT
TRIP
HZD GAS DETEC
TURBINE COMPT CARD FAULT OF
SET 5
HZD GAS DETEC
TURBINE COMPT#5
HIGH HIGH LEVEL
HZD GAS DETEC
TURBINE COMPT CARD FAULT OF
SET 6
HZD GAS DETEC
TURBINE COMPT#6
HIGH HIGH LEVEL
OMMO_5_9E_E0858_EN_V3
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
A leak of gas is detected in the turbine compartment. #2
See alarm : L45HT1_ALM
A leak of gas is detected in the turbine compartment.
See alarm : L45HT1_ALM
A leak of gas is detected in the turbine compartment. #3
See alarm : L45HT1_ALM
A leak of gas is detected in the turbine compartment.
See alarm : L45HT1_ALM
A leak of gas is detected in the ventilation compartment.
See alarm : L45HT1_ALM
A leak of gas is detected in the turbine compartment. #4
See alarm : L45HT1_ALM
A leak of gas is detected in the ventilation compartment
See alarm : L45HT1_ALM
A leak of gas is detected in the turbine compartment.
See alarm : L45HT1_ALM
A leak of gas is detected in the turbine compartment. #5
See alarm : L45HT1_ALM
A leak of gas is detected in the turbine compartment.
See alarm : L45HT1_ALM
A leak of gas is detected in the turbine compartment. #6
See alarm : L45HT1_ALM
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Revision : A
Date : 10/2011
Page :28/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L48_ALM
TURBINE INCOMPLETE SEQUENCE
Failure of unit to reach complete sequence.
L48CR_ALM
TURBINE SHAFT FAILURE TO BREAK
AWAY
The time delay is finished and the turbine shaft does not
breakaway.
Starting means fault.
L49X_ALM
AUXILIARY MOTOR OVERLOAD
One of the auxiliary motors is overloaded.
L4CT_ALM
CUSTOMER TRIP
Customer trips input to the L4CT logic have caused an
automatic trip of the unit.
Check equipment, which is the cause of the problem in the
normal sequence: starting system power, torque
converter, fuel control, and acceleration loop.
Check if the AUTO order has been executed.
Check the operation of the auxiliaries.
Check the starting means.
Check the supplies.
Check auxiliary motors to determine which motor is
overloaded and the cause of the overloading.
On the defective motor, check the overload relay, the
fuses (or the CB), and the motor with the cables.
Check the set point of the overload relay.
Check the fuses FU.1, 2 on the motor overload circuit.
Determine which of the customer trip devices caused the
trip and correct.
Operator selected excitation off.
For information
Regulation fan block starts
L4EXOFF_ALM
L4FCBRUN_ALM
L4IGVT_ALM
L4LTTH_T_ALM
EX2K OPERATOR SELECTED
EXCITATION OFF
REGULATION FAN BLOCK STARTS
INLET GUIDE VANE CONTROL
TROUBLE TRIP
The I.G.V. position is not correct.
Adjustment of the hydraulic jack.
Problem of the setting values.
LUBE OIL HEADER TEMPERATURE
SNSR FLT: TRIP
The 3 thermocouple are faulty
Temperature of lube oil is too high.
Shutdown TG
For information
Check the I.G.V. control system.
Check the proper operation and the setting values of the
LVDT 96 TV_1 and 2.
Check the adjustment of the hydraulic jack. Refer to the
control specifications.
Check the lube oil skid (exhauster, heater, pump).
Check proper operation of thermocouple
LTTH1/LTTH2/LTTH3.
Breakers failure, wire lost, timer failure
Check power supply, wiring, breakers, timer in M.C.C
Breakers failure, wire lost, timer failure
Check power supply, wiring, breakers, timer in M.C.C
88QA fault
Check 88QA
Check 88QE
Check electrical circuit
L4QETRPZ_ALM
DC PUMP FIRST STEP TIMER
FAILURE
DC PUMP SCND STEP TIMER
FAILURE
AC PUMP FAILURE TRIP
L4QETST_ALM
DC PUMP TEST FAILED
L4QESTP1_ALM
L4QESTP2_ALM
OMMO_5_9E_E0858_EN_V3
88QE fault
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Revision : A
Date : 10/2011
Page :29/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L4TK_WW_ALM
EXHAUST FRAME BLOWER FAULT.
WATER WASH INHIBITED
Exhaust frame blower fault.
Impossible to wash TG.
L51QE_ALM
EMERGENCY LUBE OIL OVERLOAD
The emergency lube oil pump is faulty.
L51QEFLT_ALM
DC PUMP ABNORMAL POWER
EMERGENCY LUBE OIL PUMP OUT
OF SERVICE
ATOMIZING AIR BOOSTER MCC
CONTACT POSITION ALARM
See alarm : L51QE_ALM
Check the operation of the motors 88 TK_1 and _2.
Inspect cooling airflow passages.
Check the suction silencers.
Check the pressure switches 63 TK _1,2.
Check the time over current relay 51 QE.
Check the mechanical status of the pump.
Check supply of the motor pump.
See alarm : L51QE_ALM
See alarm : L51QE_ALM
See alarm : L51QE_ALM
Atomizing air booster Command trouble
Check Atomizing air booster power supply in MCC
Something is blocking the fan
Motor overload
Short circuit
Motor fault
Check that nothing is blocking the fan
Check the fan can run in good conditions
Check electrical circuit
Check motor
Determine the breaker, which is open, and find the reason
of its position (overload, fuses fault, defected motor,
mechanical problem of the motor or the fan, supply, etc.).
Correct cause of problem and close breaker.
L51QEOFF_ALM
L52AB_ALM
L52BT_ALM
TURBINE COMPARTMENT VENT.
FAULT
L52FC1_ALM
COOLING WATER FANS PERMANENT Breaker opened by operator or tripped by high motor
BLOCK FDBCK FAULT
temperature.
L52FC2_ALM
L52FDY_ALM
L52FM_ALM
L52G1_ALM
L52HA11_ALM
L52HA30_ALM
COOLING WATER FANS REGULATOR
See alarm : L52FC1_ALM
BLOCK FDBCK FAULT
FUEL FORWARDING MOTOR
The remote breaker is detected open
BREAKER OPEN
FLOW DIVIDER STARTUP MOTOR
Flow divider startup motor breaker fault
BREAKER FAULT
GENERATOR BREAKER TRIPPED
GAS COMPARTMENT HEATER
BREAKER FAULT
AUXILIARY COMPARTMENT HEATER
BREAKER FAULT
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
See alarm : L52FC1_ALM
Determine the cause of this trouble and repair.
Check flow divider startup motor breaker
Generator breaker has been tripped by an automatic
protective device or manually.
Determine device that tripped the breaker.
The problem should be corrected before coupling again.
NOTE:
For a new coupling, one must give a new start order for
proper operation of synchronizing sequence.
Discrepancy between start order and feedback
Check feedback match with heater status
Discrepancy between start order and feedback
Check feedback match with heater status
All right reserved Copyright
Revision : A
Date : 10/2011
Page :30/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L52HQ1_ALM
HYDRAULIC SUPPLY AUXILIARY
PUMP DISCREPANCY
Motor, pump fault
Motor supply fault.
Oil leakage on HP circuit.
Check for leakage.
Check the mechanical status of the motor and the pump.
Check the motor supply (fuses, breaker, connection)
Check the proper operation of :
_ the pressure switch 63 HQ_1.
_ the pressure transmitter 96 HQ_1.
_ the overload relays 49 HQ_1 and 2.
Check the status of the filter (an alarm must appear).
L52HT30_ALM
TURBINE COMPARTMENT HEATER
BREAKER FAULT
Discrepancy between start order and feedback
Checks feedback match with heater status
L52JS_ALM
HEAT VENT WI COMPARTMENT
VENT. FAULT
Something is blocking the fan
Motor overload
Short circuit
Motor fault
Check fuses, breakers, protections, and supply.
Check the mechanical status of the fan and the motor in
trouble.
Check the proper operation of the water injection fan
motor 88JS.
After doing corrective action, close the breaker in trouble.
L52MCBALM_ALM
DEFAULTS FUSIBLES
UNDERVOLTAGE RELAY
Customer signal
Specific customer
L52QA_ALM
AUXILIARY LUBE OIL PUMP MOTOR
RUNNING
The main lube oil pump is supplying insufficient lube oil
pressure due to pump failure or leaks.
Examine main lube pump.
Check pump output and main lube filters for leaks or
plugging.
Check proper operation of pressure switch 63 QA.
L52QB_ALM
GENERATOR LIFT STANDBY BEAR
LIFT OIL PMP RUNN
Lube oil pump ready or running
For information
L52TG_ALM
TURNING GEAR MOTOR TROUBLE
The turning gear motor is not running during the turning
gear sequence.
EXHAUST FRAME BLOWER #1
DISCREPENCY
EXHAUST FRAME BLOWER #2
DISCREPENCY
Blower is running while there is no run signal
Blower is not running while there is run signal
Blower is running while there is no run signal
Blower is not running while there is run signal
LOAD COMP. COOLING FAN MOTOR
TROUBLE
The load compartment cooling fan motor is not running.
L52TK1_ALM
L52TK2_ALM
L52VG_ALM
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Check the turning gear motor drawer 88 TG (fuses,
breaker, relay, power supply).
Check the AC supply power.
Check 88TK1
Check electrical circuit
Check 88TK2
Check electrical circuit
Check the power supply of the motor drawer in the T.C.C.
Check the relay.
Determine the trouble and repair as soon as possible.
Date : 10/2011
Page :31/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
L52VL_ALM
HEAT VENT DLN COMPARTMENT
VENT. FAULT
L52WCY_ALM
POSSIBLES CAUSES
The second fan motor starts (88VL_1 or 2).
One of the two fan is in trouble
One of the two motors is in trouble 88VL_1 or 88VL_2.
Motor supply fault.
Water pump breaker open
Pump is running while there is no run signal
Pump is not running while there is run signal
ACTIONS TO BE TAKEN
Check the electrical status of the motor.
Check the motor supply (breaker, fuses, connection).
Check the fan in trouble.
Bad over-speed configuration trip
Change the over-speed configuration trip with the toolbox
L5CMPST_TRP
WATER PUMP BREACKER OPEN
WATER INJECTION PUMP
DISCREPENCY
VPRO - OS SETPOINT CONFIG
ERROR TRIP
VPRO - COMPOSITE TRIP(S)
One or more module of one VPRO card fault
L5E_ALM
MANUAL TRIP _ LOCAL
The emergency stop pushbutton has been pressed.
Check modules on each VPRO cards
Correct abnormality that caused the operator to push the
emergency stop pushbutton.
L5ESTOP1_ALM
E-STOP 1 PROTECTIVE CIRCUIT
LATCHED
Emergency stop by protective circuit.
L52WN1_ALM
L5CFG_TRP_AL
L5ESTOP1_FZA
L5PPRO_LATCH
L60BOG_ALM
L60FSRG_ALM
L60TRF_ALM
L62CD_ALM
VPRO - EMERGENCY STOP PB
DEPRESSED
Someone has depressed the emergency stop pb
PROTECTIVE PPRO CARD TRIP Diagnostic alarm on the dedicated card PPRO
LATCH
Defaut communication
TURBINE STARTUP BOGGED DOWN Problems during startup
TRIP
Manual FSR control has not been reset to a position where
FSR GAG NOT AT MAX LIMIT
it will not interfere with automatic FSR control.
REGULATION IN FSR TEMPERATURE
The regulation is in FSR temperature control.
CONTROL
The cool-down sequence has been interrupted before the
COOLDOWN SEQUENCE RUNNING
end of normal cycle.
L62LV_ALM
WATER WASH NEEDED
Water wash needed after 15 operating with crude oil.
L62TT2_ALM
FAILURE TO START
The master protective logic signal ‘’L4’’ has tripped the unit
twice or if the unit is operating in remote, flame was not
established after two tries at establishing flame.
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Close water pump breaker
Check 88TK3
Check electrical circuit
Correct abnormality that caused the emergency stop
Check that the problem for witch the emergency stop pb
was pressed is resolved
WARNING NEVER DEPRESS THE EMERGENCY STOP
PB BEFORE TO BE SURE THE PROBLEM IS
RESOLVED
Check Diagnostic alarm relating to the card mentioned by
using the toolbox.
Check trip diagram on HMI
Refer to specific alarm(s)
Raise the manual FSR control to maximum.
Check the regulation system CPD.
Continue cool-down sequence except in the case of major
problem.
Water wash has to be done, and then operation with crude
oil is authorized.
Check all signals going making up the ‘’L4’’ logic signal to
determine which caused the problem or determine cause
of lack of flame establishment.
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L62WWY_ALM
VENT AFTER AN OFF LINE WASHING
INTERRUPTED
Vent after an off line washing interrupted
Refer to specific chapter
L63AD4L_ALM
ATOMIZING AIR DIFFERENTIAL
PRESSURE LOW
Atomizing air compressor not providing adequate pressure.
Normal shutdown.
Lack of air at the upstream of the compressor.
Compressor fault (CA1_1 or 2).
Step-up gear fault.
Motor fault (88 AK_1 or 2).
L63ADL_ALM
ATOMIZING AIR DIFF. PRESSURE
LOW
Atomizing air compressor not providing adequate pressure.
L63ADLA_ALM
ATOMIZING AIR DIFFERENTIAL
PRESSURE LOW
The discharge pressure of the atomizing air H.P.
compressor is too low.
L63BWL_ALM
SKID WASHING PRESSURE OR
FLOW FAULT
Skid washing pressure or flow fault
L63CA1L_ALM
INLET AIR FILTER COMPRESSED AIR
PRESS LOW ALARM
Air filter compressor pressure low.
L63CPDL_ALM
CPD PRESSURE LOW ALARM
CPD pressure low alarm
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Check atomizing air system.
Check the valves .are correctly positioned.
Check for leakage.
Check the status (mechanical and electrical) of the
compressors and the step-up gears.
Check motor.
Check the check valves before step-up gears.
Check the proper operation of the pressure switches 63
AD_1, 2 and their setting point.
Check the proper operation of the transmitter 96AD_1.
Check atomizing air system.
Check on running gear if the shaft driver atomizing air
compressor is running: if coupling broken replace the
atomizing air compressor before starting up the limit.
If atomizing air compressor is correct, check compressor
during operation (vibration) and the circuit (help with the
pressure indicators).
Check the pressure switches 63AD and their setting point.
Check the atomizing air H.P. compressor.
Check the atomizing air piping.
Check the pressure switch 63 AD_1.
Check washing skid
Check the cleanliness of the air filter.
Check the proper operation of the pressure switch 63
CA_1.
NOTE:
Refer to Manufacturer’s recommendations for air filters
maintenance in specific volumes.
Check GT compressor system
Date : 10/2011
Page :33/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L63CSH_ALM
COMPRESSOR INLET DIFF
PRESSURE HIGH TRIP
Inlet filter dirty.
L63CSH_SENSR
TURBINE COMPRESSOR INLET
PRESS. SW. TROUBLE
The pressure switches of the air inlet compressor are in
trouble.
L63CSHH_ALM
COMPRESSOR INLET DIFF
PRESSURE HIGH TRIP
Inlet filter dirty.
VANADIUM INHIBITOR FLOW
CHECKING
FUEL FWD PUMP DISCHARGE
PRESSURE LOW
FUEL FORWARDING PRESS. HIGH
ALARM
HEAT VENT 63FG-1 SENSOR
TROUBLE
HEAT VENT 63FG-2 SENSOR
TROUBLE
The pressure of the fuel additive is high
Pressure switch fault
GAS FUEL PRESSURE LOW
Gas fuel pressure to turbine has been sensed as low.
L63FLZ_ALM
LIQUID FUEL PRESSURE LOW
Inlet liquid fuel pressure is low.
Pressure switch 63 FL_2 trouble (see control specifications
for the setting value).
Strainer, filter, pumps fault.
Leakage.
L63FU1L_ALM
HEAVY FUEL OIL LOW PRESSURE AT The pressure of the heavy fuel is too low, and the unit
PUMP DISCHARGE
transfers automatically to distillate fuel.
L63FAH_ALM
L63FD1L_ALM
L63FD2H_ALM
L63FG1_ALM
L63FG2_ALM
L63FGL_ALM
OMMO_5_9E_E0858_EN_V3
The pressure on the fuel-forwarding skid is low.
The pressure on the fuel-forwarding skid is high.
ACTIONS TO BE TAKEN
Check the filter status. Change it, if necessary.
Check the differential pressure switches 63 CS (operation
and setting point).
NOTE:
Refer to specific volumes for Air filter maintenance.
Check the state of the pressure switches 63 CS_1 and _2
(proper operation and setting point).
Check their logic circuit.
Check the filter status. Change it, if necessary.
Check the differential pressure switches 63 CS (operation
and setting point).
NOTE:
Refer to specific volumes for Air filter maintenance.
Check the inhibition skid
Check the forwarding skid.
Check the pressure switch
Check the forwarding skid.
Check the pressure switch 63 FD_2.
Heat vent 63FG-1 sensor trouble
Check heat vent 63FG-1 sensor
Heat vent 63FG-2 sensor trouble
Check heat vent 63FG-2 sensor
All right reserved Copyright
Revision : A
Check cause of low supply pressure: check the gas fuel
pressure supply, the strainer and the pressure switch
63 FG_3.
Check the fuel-forwarding skid (pumps, motors, filters).
Check the pressure switch 63 FL_2 (operation and
setting).
Check the strainer filter at the turbine inlet.
Check for leakage.
Check the piping for leak.
Check the pressure switch
Check the heavy fuel forwarding system.
Date : 10/2011
Page :34/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L63FU2LA_ALM
HEAVY FUEL PRESSURE LOW
The pressure of the heavy fuel is too low, and the unit
transfers automatically to distillate fuel.
L63FU3HZ_ALM
NAPHTA PRESSURE HIGH
Forwarding skid in trouble.
Pressure switch faulty.
L63GSD1H_ALM
L63GSD2H_ALM
GAS FUEL SCRUBBER GAS 101FI
DIFF PRESS HIGH
GAS FUEL SCRUBBER GAS 121FI
DIFF PRESS HIGH
Check the piping for leak.
Check the pressure switch 63 FU_2.
Check the heavy fuel forwarding system.
Check the forwarding skid.
Check the proper operation of the pressure switch 63
FU_3.
Gas scrubber filter/sep 101FI DIF is clogged
Clean gas scrubber filter/sep 101FI DIF
Gas scrubber filter/sep 121FI DIF is clogged
Clean gas scrubber filter/sep 121FI DIF
L63HF1H_ALM
HYDR. FILTER DIFF. PRESSURE
HIGH
The hydraulic oil filter is dirty.
L63HQ1L_ALM
HYDRAULIC SUPPLY PRESSURE
LOW
Hydraulic supply pressure is low.
L63LF2H_ALM
LIQUID FUEL FILTER DIFF. PRESS.
HIGH
The differential pressure too high at the fuel oil filter.
L63LF30H_ALM
CRUDE OIL
FILTER CLOGGED
Crude oil filter clogged
L63LF3H_ALM
FUEL FILTER DIFF. PRESSURE HIGH
The filter of the fuel skid is dirty.
L63LF7H_ALM
LIQUID FUEL FILTER DIFF PRESS
HIGH
The filter of the fuel skid is dirty.
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
All right reserved Copyright
Revision : A
Check hydraulic pressure with the pressure gauge.
Changeovers the hydraulic oil filters and replaces it if
necessary.
Check the pressure switch 63 HF.
Check the closing of test valve.
Check hydraulic supply pressure filter and differential
pressure gauge, regulating valve or, pump or proper
operation of pressure switch 63 HQ_1.
Check the closing of the test valves.
Check the filter status.
Check for leakage.
Inspect fuel oil filters and correct condition.
Check proper operation of fuel oil filter differential pressure
switch (operation and setting point) 63 LF_1.
Change or repair if necessary.
Check the closing of the test valve.
Check filter
Clean or change the filter
Check the filter and changeover, if necessary.
Check the differential pressure switch 63 LF_3.
Check the filter and changeover, if necessary.
Check the differential pressure switch 63 LF_3.
Date : 10/2011
Page :35/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L63PGFT_ALM
GAS FUEL NOZ. PURGE SYSTEM
PRESSURE HIGH
The two purge valves VA 13_1 and VA 13_2 are seen
closed and the pressure switch 63 PG_1 has detected a
high pressure.
Check the position of the purge valves VA 13_1 and VA
13_2.
Check the limit switches 33 PG_1 and 33 PG_3 (proper
operation).
Check the pressure switch 63 PG_1.
L63PLLZ_ALM
LIQUID FUEL PURGE LOW AIR
PRESS
The liquid fuel air purge pressure is low.
Check the pressure switch 63PL-21.
L63QA2L_ALM
LUBE OIL PRESSURE ALARM
BEARING
Lube system leaks or pump or transmitter trouble.
L63QBLY_ALM
GEN BRG LIFT LOW PRESS AT
PUMPS OUTLET
Lift pump fault
Motor fault
Pressure switch fault
L63QQ10H_ALM
LUBE OIL MIST FILTER - DIFF. PRESS
Clogged filter.
- HIGH
L63QQ1H_ALM
MAIN LUBE OIL FILTER DIFF.
PRESSURE HIGH
L63QQ8H_ALM
L63QT_ALM
L63QT_SENSR
TRIP OIL FILTER DIFF. PRESSURE
HIGH
TURBINE LUBE OIL HEADER PRESS
LOW TRIP
LUBE OIL PRESSURE SWITCH
TROUBLE
OMMO_5_9E_E0858_EN_V3
Repair leaks or pump.
Check proper operation of the transmitter (96QA_2) and
the pressure switch 63 QA-2.
Check the closing of the test valves.
Check the proper operation of the bearing lift pump
Check the motor supply (fuses, breaker, connection)
Check for leakage
Check the proper operation of the pressure switch 63QB
(operation and setting point)
88QA fault
88QE fault
Loss of fluid pressure and deterioration of fluid purity may
result.
Change filter.
Check the pressure switch 63QQ_1.
Loss of fluid pressure and deterioration of fluid purity may
result.
Change filter.
Check the pressure switch 63QQ_1.
Check the lube oil filter.
Check the pressure switch 63QQ_8.
Check 88QA
Check 88QE
Bad signal from lube oil pressure switch.
Check pressure switches 63QT_2A, 2B and 63QA.
Clogged filter.
The lube oil filter is dirty.
All right reserved Copyright
Revision : A
Date : 10/2011
Page :36/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L63QTX_ALM
TURBINE LUBE OIL HEADER PRESS
LOW TRIP
Lube oil pressure has fallen below the trip level.
L63TF10H_ALM
FLOW INLET FILTER DIFF PRESSURE
Inlet filter excessive pressure drop.
Filter is dirty.
L63TF1H_ALM
L63TFH_ALM
L63TFH10_ALM
TURBINE AIR INLET DIFF. PRESS.
ALARM
INLET FILTER PRESSURE DROOP
TRIP ALARM
INLET FILTER PRESSURE DROOP
TRIP ALARM
Check the proper operation of the pressure-regulating
valve VPR_2.
Check the proper operation of the lube oil pumps.
Check for leakage.
Check the pressure switch 63 QT_2A.
Check the proper operation of the transmitter 96QA_2
Determine cause and correct before restarting unit.
Check the pressure drop.
If the pressure is excessive, change the air filters.
If the pressure is correct, check the pressure switch 63 TF
and its setting point.
NOTE:
Refer to Manufacturer’s recommendations for air filters
maintenance in specific chapters.
See alarm : L63TF10H_ALM
See alarm : L63TF10H_ALM
See alarm : L63TF10H_ALM
See alarm : L63TF10H_ALM
See alarm : L63TF10H_ALM
See alarm : L63TF10H_ALM
L63TK_ALM
EXHAUST FRAME COOLING AIR
PRESSURE LOW
Exhaust frame blower motor not operating. Air passages
blocked.
L63TKY_ALM
EXHAUST FRAME PRESSURE LOW
Exhaust frame pressure low.
L63VGH_ALM
LOAD COMP INLET FILTER
CLOGGED - BY PASS OPEN
Heat vent load compartment inlet air filter clogged
L63WC1L_ALM
COOLING WATER PUMP DISCH
PRESSURE LOW.
The pressure of cooling water pump is low.
L63WN3H_ALM
WATER INJECTION FILTER DIFF
PRESS HIGH
The water filter is dirty.
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
All right reserved Copyright
Revision : A
Check the operation of the motors 88 TK_1 and _2.
Inspect cooling airflow passages.
Check the suction silencers.
Check the pressure switches 63 TK _1,2.
Check the operation of the motors 88 TK_1 and _2.
Check the suction silencers.
Check the pressure switches 63 TK _1,2.
Clean heat vent load compartment inlet air filter#2
Check the pumps and motor.
Check leakage.
Check the status of the filters.
Check the differential pressure, clean the filter or change it
if necessary.
Check the pressure switch 63 WN3.
Date : 10/2011
Page :37/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L64D_ALM
BATTERY 125 VDC GROUND
Insulation failure has resulted in a ground on the 125 VDC
system.
L71CBL1_ALM
L71CBL2_ALM
L71CBL4_ALM
CO2 GAS LOSS ZONE1
CO2 GAS LOSS ZONE2
CO2 GAS LOSS ZONE3
The CO2 bottles are empty
The CO2 bottles are empty
The CO2 bottles are empty
L71FA1L_ALM
FUEL ADDITIVE STORAGE TANKLEVEL LOW
The level of the fuel additive storage tank is low.
L71FA1LX_ALM
L71FA2L_ALM
L71FF2T_ALM
L71FF2T_SNSR
L71FF4L_ALM
L71GS12A_ALM
L71GS12B_ALM
L71GS13_ALM
CRUDE OIL FWD ADDITIVE
STORAGE TANK- LEVEL LOW
CRUDE OIL ADDITIVE SKID TANKFAULT
LIQUID FUEL HIGH LEAKAGE ON
SKID - TRIP
LIQUID FUEL LEAKAGE SNSRS
FAULT ON LIQUID SKID
LIQUID FUEL LOW LEAKAGE LEVEL
ON SKID
GAS FUEL SCRUBBER 101FI-2A
LEVEL HIGH
GAS FUEL SCRUBBER 101FI-2B
LEVEL HIGH
GAS FUEL SCRUBBER 101FI-3 LEVEL
HIGH
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
Immediate action should be taken to locate ground and to
repair, because if a second ground occurs, this can result
in severe damage to the wiring and to the battery. As soon
as possible, shut down the unit and check the 125 VDC
power.
Isolate ground and remove from system.
Check the DC motors and all circuits supplied with dc
voltage.
CAUTION:
During this repair, the generator and the starting engine
breakers must be opened for safety.
Change the CO2 bottles
Change the CO2 bottles
Change the CO2 bottles
Check the level in the tank.
Check the level indicator 71 FA_1.
Check for leaks.
Check pipes.
The level of the crude oil FWD additive storage tank is low.
Additive tank
The crude oil additive skid tank is fault.
Check the tank.
Liquid fuel low leakage level on GT frame
Check for leakage
Liquid fuel low leakage level on GT frame
Sensors fault
Check for leakage
Check sensors
Liquid fuel low leakage level on GT frame
Check for leakage
Condensate to high in gas separator
Purge gas separator
Condensate to high in gas separator
Purge gas separator
Condensate to high in gas separator
Purge gas separator
All right reserved Copyright
Revision : A
Date : 10/2011
Page :38/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L71GS1H_ALM
L71GS1HT_SNS
L71GS22A_ALM
L71GS22B_ALM
L71GS23_ALM
L71GS2H_ALM
L71GS2HT_SNS
L71GSHHT
L71GSHHT_ALM
L71QH_ALM
ALARM TEXT
GAS FUEL COALESC FILTER #1
LEVEL HIGH
GAS FUEL #1 COALESC FILTER
LEVEL SENSOR TROUBLE
GAS FUEL SCRUBBER 121FI-2A
LEVEL HIGH
GAS FUEL SCRUBBER 121FI-2B
LEVEL HIGH
GAS FUEL SCRUBBER 121FI-3 LEVEL
HIGH
GAS FUEL COALESC FILTER #2
LEVEL HIGH
GAS FUEL #2 COALESC FILTER
LEVEL SENSOR TROUBLE
GAS FUEL SEPARATOR
CONDENSATE VERY HIGH LEVEL
TRIP
GAS FUEL SEPARATOR
CONDENSATE VERY HIGH LEVEL
LUBE OIL LEVEL HIGH
OMMO_5_9E_E0858_EN_V3
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
Gas fuel coalesc filter #1 is clogged
Clean gas fuel coalesc filter #1
Gas fuel #1 coalesc filter level sensor trouble
Check gas fuel #1 coalesc filter level sensor
Condensate to high in gas separator
Purge gas separator
Condensate to high in gas separator
Purge gas separator
Condensate to high in gas separator
Purge gas separator
Gas fuel coalesc filter #2 is clogged
Clean gas fuel coalesc filter #2
Gas fuel #2 coalesc filter level sensor trouble
Check gas fuel #2 coalesc filter level sensor
Condensate to high in gas separator
Purge gas separator
Condensate to high in gas separator
Purge gas separator
High lube oil tank level or some liquid is coming in the tank.
Check proper operation of the tank level 71QH_1.
Investigate cause of high-level alarm and restore normal
level.
NOTE:
Stop the unit if there is some other fluid with the lube oil
(water or liquid fuel). In this case, never restart the unit
before repair.
All right reserved Copyright
Revision : A
Date : 10/2011
Page :39/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
Check proper operation of the level 96QL_1. Checks lube
oil system for possible leakage or for excessive
consumption.
Check the transmitters 96QL-1.
Repair and restore normal level with proper oil (see piping
schematics for oil level reference and lube oil
recommendations).
NOTE:
In these units, oil consumption is normal so, refilling is
necessary periodically with proper oil.
Check the level of water-cooling.
Check the water-cooling system.
Check the bottom of the generator package to define the
leaks if there is any leak.
Check the indicator switch.
L71QL_ALM
LUBE OIL LEVEL LOW
Lube oil tank level low.
L71WG1_ALM
GENERATOR LIQUID LEVEL
DETECTOR
A leak of the water-cooling system, or a leak of oil, is
detected.
L71WG2_ALM
GENERATOR LIQUID LEVEL
DETECTOR 2# NDE
See alarm : L71WG1_ALM
See alarm : L71WG1_ALM
Cooling water tank level low.
The alarm will actuate when the cooling water tank level
drops below a minimum level (see piping schematics).
Repair leaks, and add properly treated water.
Check for proper operation of level indicator 71WL.
NOTE:
If there is some water in the lube oil tank, one must stop
the unit.
Sump tank high level
Empty sump tank
Sump tank very high level
Check limit switch and pump system
Sump tank low level
Check limit switch and pump system
Electrical fault on the emergency lube oil pump motor
Check the emergency lube oil pump and motor.
L71WL_ALM
L71WS1_ALM
L71WS3_ALM
L71WS4_ALM
L72QE_ALM
COOLING WATER LEVEL LOW
SUMP TANK HIGH LEVEL LIMIT
SWITCH
SUMP TANK HIGH HIGH LEVEL
SUMP TANK LOW LEVEL LIMIT
SWITCH
EMERGENGY LUBE OIL PUMP
MOTOR ELECTRICAL FAULT
OMMO_5_9E_E0858_EN_V3
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Revision : A
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L72QETST_ALM
DC PUMP DID NOT START
Loss of DC power to aux lube oil pumps.
Oil leakages.
Motors fault
Pumps fault.
Sensor fault.
L72QEZ_ALM
EMERGENCY LUBE PUMP MOTOR
RUNNING
The main pump driven accessory gear and AC powered
lube oil pump have not supplied sufficient lube oil pressure
because of pump failure or leaks.
Determine cause of DC power loss.
Refer to the specific alarms about electrical faults
signaled.
Check the motors (88QE).
Check the oil pumps.
Check the status of the transmitter (63QE).
Check for leaks and pump malfunction.
Check proper operation of pressure switches 63 QL, 63
QT_2A and 63 QT_2B.
The batteries compartment temperature is high.
Check heating and ventilation system.
The batteries compartment temperature is low.
Check heating and ventilation system.
The control compartment temperature is high.
Check heating and ventilation system.
The control compartment temperature is high.
Check heating and ventilation system.
Compressor bleed valves have not operated properly. They
are in the wrong position or required an excessive amount
of time to move from one position to the other.
Investigate problem. The problem should be corrected
before restarting. The Master reset switch must be
pressed before restarting.
Check proper operation of the solenoid valve 20 CB.
Check the control air supply of VA 2_1, 2_2, 2_3, 2_4
valves and the opening of the isolating valve.
Check the cleanliness of the air separator.
Check the limit switches 33 CB.
Over-speed trip being checked.
See ‘’Over-speed trip checks’’ module 10 of this chapter.
Remote breaker opening detected
For information
L74BATH_ALM
L74BATL_ALM
L74HL_ALM
L74HT_ALM
L83CBLIMIT
L83HOST_ALM
L83RBO_ALM
L83WW_ALM
L83WWON_ALM
L86ARS_ALM
BATTERIES COMPARTMENT
TEMPERATURE HIGH
BATTERIES COMPARTMENT
TEMPERATURE LOW
CONTROL COMPARTMENT TEMP
LOW
CONTROL COMPARTMENT
TEMPERATURE HIGH
COMP BLD VLV FAIL TO CLOSE LIMITED
OVERSPEED TEST MODE SELECTED
_ HP
REMOTE BREAKER OPENING
DETECTED
WASHING ON-LINE PROHIB.INLET
TEMP.LOW
24H DELAY NECESSARY SINCE THE
LAST WW
AC TRANSFER FAULT
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
The on-line water wash is inhibited because the temperature The on-line water wash will be possible as soon as the
is low.
temperature will be in the limit spread.
24 hours necessary since the last water wash.
Wait the period of 24H to start again on-line washing.
A512-40G1 loss of excitation (A)
Check exciter cubicle
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Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L86BTTEST_AL
HEAT VENT TURB COMP TEST
ABORTED
BT test stopped because of ventilation pressure fault
Check BT or leaks in compartment
L86BTX_ALM
LOSS OF TURBINE COMPARTMENT
COOLING FAN
The turbine compartment ventilation is faulty.
L86CBA_ALM
COMPRESSOR BLEED VALVE
POSITION TROUBLE
Compressor bleed valves have not operated properly. They
are in the wrong position or required an excessive amount
of time to move from one position to the other.
L86CBT_ALM
L86CPR_FLT
COMPRESSOR BLEED VALVE
POSITION TROUBLE TRIP
COMP OPERATING LIMIT CONTROL
FAULT
See alarm : L86CBA_ALM
See alarm : L86CBA_ALM
Inlet heating control valve fault.
Compressor discharge pressure transmitters fault.
Check operation of bleed heat control valve.
Check the compressor discharge pressure transmitters.
Determine the cause of this fault before attempting a new
start.
NOTE:
The master reset function must be selected before
restarting.
Check the proper operation of heavy fuel inhibitor pump.
Check the tank level.
Check the proper operation of heavy fuel inhibitor the
pump.
Check SRV valve
Check regulation constant are the same e as in the A010
Check GCV valve
Check regulation constant are the same e as in the A010
Check SRV valve
Check regulation constant are the same e as in the A010
L86CRTX_ALM
STARTING MOTOR PROTECTIVE
LOCKOUT
The cranking motor protective system has been initiated.
L86FA_ALM
FUEL ADDITIVE CIRCUIT FAULT
Low level of inhibitor tank.
Heavy fuel inhibitor pump faulty.
L86FAX_ALM
CRUDE OIL FWD
Crude oil FWD additive pumps fault alarm
L86FPG2HT_A
POST-IGNITION P2 HIGH TRIP
SRV valve to much opened
L86FPG2IH_AL
PRE-IGNITION P2 PRESS HIGH IGN
INHIBIT
GCV valve not enough opened
L86FPG2LT_A
POST-IGNITION P2 LOW TRIP
SRV valve not enough opened
L86FS_ALM
LIQ FUEL FALSE START-USE RESET
DISPLAY
Liquid fuel false start-use reset display
OMMO_5_9E_E0858_EN_V3
Check the ventilation system of this compartment (power
supply, motors, fans, electrical circuit...).
Check the position of vent flap.
Check the proper operation of the limit switch 33BT
Investigate problem. The problem should be corrected
before restarting. The Master reset switch must be
pressed before restarting.
Check proper operation of the solenoid valve 20 CB.
Check the control air supply of VA 2_1, 2_2, 2_3, 2_4
valves and the opening of the isolating valve.
Check the cleanliness of the air separator.
Check the limit switches 33 CB.
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Revision : A
After sequencing reset by 86FSRST_CPB
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Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L86FT_ALM
L86FUX_ALM
L86G1AMON_AL
L86G1BMON_AL
L86G2AALM_AL
L86G2AMON_AL
ALARM TEXT
POSSIBLES CAUSES
HEAVY FUEL TEM. FAULT XFERT
LOCKOUT
COMPLETE LOSS OF HEAVY FUEL
FWD PUMPs
74/86G-1A LOCK OUT RELAY COIL
FAULT
The temperature of the heavy fuel is not correct. The
transfer is locked.
Complete loss of heavy fuel FWD pumps crude oil FWD
additive pumps.
74/86G-1B LOCK OUT RELAY COIL
FAULT
74/86G-2A LOCK OUT RELAY TRIP
74/86G-2A LOCK OUT RELAY COIL
FAULT
L86G2BALM_AL
74/86G-2B LOCK OUT RELAY TRIP
L86G2BMON_AL
74/86G-2B LOCK OUT RELAY COIL
FAULT
L86GCVT_ALM
GAS CONTROL VLV NOT
FOLLOWING - TRIP
L86GLTA_ALM
L86GLTB_ALM
L86GSC10T12A
L86GSC1T3_AL
L86GSC4T6_AL
L86GSC7T9_AL
GAS LEAK TEST OF SRV FAILED
GAS LEAK TEST OF GCV/VENT
FAILED
2/3 GEN STATOR WIND. CENT. TEMP
SNSR FLT #10-11-12
2/3 GEN STATOR WINDING CENTER
TEMP SNSR FLT #1-2-3
2/3 GEN STATOR WINDING CENTER
TEMP SNSR FLT #4-5-6
2/3 GEN STATOR WINDING CENTER
TEMP SNSR FLT #7-8-9
OMMO_5_9E_E0858_EN_V3
74/86G-1A lock out relay coil fault
Lockout relay 74/86G-1B is faulty.
Wiring circuit in GCP sequence
Tripping coil of the 52G circuit breaker is faulty.
74/86G-2A lock out relay trip
74/86G-2A lock out relay coil fault
The lockout 74/86G-2B relay tripped in the GCP and sent
opening order 41E and 52G breakers
Lockout relay 74/86G-2B is faulty.
Wiring circuit in GCP sequence
Tripping coil of the 52G circuit breaker is faulty.
Start inhibited + transfer to fuel if running on gas or transfer
to gas inhibited.
The gas control valve feedback is abnormal.
Supply fault.
Sensors defected.
Valve and servo-valve fault.
ACTIONS TO BE TAKEN
Check heavy fuel heating system
Check pumps.
Check 74/86G-1A
Check relay
Check 74/86G-2A
Check 74/86G-2A
Check 74/86G-2B
Check relay
Check LVDT, 96 GC_1, 2 (setting value, wiring).
Check the calibration of the VGC.
Check the proper operation of the servo-valve 65 GC_1.
Gas leak of SRV valve
Check SRV valve
Gas leak of GCV valve or Gas Purge Inter valve
Check GCV valve or Gas Purge Inter valve
Temperature sensor fault
2 of 3 Generator RTDs failure
Temperature sensor fault
2 of 3 Generator RTDs failure
Temperature sensor fault
2 of 3 Generator RTDs failure
Temperature sensor fault
2 of 3 Generator RTDs failure
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
Decrease the generator load
Check RTD and associated connections
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Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L86GVA_ALM
INLET GUIDE VANE CONTROL
TROUBLE
The I.G.V. position is not correct.
Adjustment of the hydraulic jack.
Problem of the setting values.
Check the I.G.V. control system.
Check the proper operation and the setting values of the
LVDT 96 TV.
Check the adjustment of the hydraulic jack.
Discrepancy between start order and feedback
Check feedback match with heater status
L86HEATR_ALM
L86JSX_ALM
L86N_ALM
L86N1MON_ALM
L86N2MON_ALM
L86NX_ALM
L86PUR_ALM
L86PURC_ALM
L86PURT_ALM
COMPARTMENT HEATER
OPERATING - PRE IGNITION TRIP
LOSS OF W. I. COMPARTMENT
VENTILATION
ELECTRICAL TROUBLE NORMAL
SHUTDOWN
74/86N-1 LOCK-OUT RELAY COIL
FAULT
74/86N-2 LOCK-OUT RELAY COIL
FAULT
STARTUP CHECK STOP GEN
PROTECTION FAILURE SHUTDOWN
HEAVY FUEL TG - TRIP
HEAVY FUEL PURGE VALVE FAILURE
TO OPEN
HEAVY FUEL PURGE VALVE FAILURE
TO CLOSE
Loss of W.I. Compartment ventilation.
Electrical trouble on the generator with normal shutdown for
the unit.
74-86N-1 lock-out relay coil fault
Check 74-86N-1 lock-out relay coil
74-86N-2 lock-out relay coil fault
Check 74-86N-2 lock-out relay coil
The general protection of the generator is defect
Check generator system
GT trip while running with heavy liquid fuel
For information
Check the proper operation of the purge valve.
The heavy fuel purge valve failed to open.
The heavy fuel purge valve failed to close.
L86PURZ_ALM
HEAVY FUEL PURGE TG TRIP SINCE
1 HOUR
GT tripped since 1 hour and operator heavy purge
confirmation not given
L86QE_ALM
DC PUMP ELECTRICAL TROUBLE
START INHIBITED
DC pump electrical trouble start inhibited
L86S
AUTO SYNCHRONIZING LOCKOUT
Auto synchronizing self-checking system has detected a
synchronizing equipment abnormality.
OMMO_5_9E_E0858_EN_V3
Check fan
Check electrical circuit
Determine the electrical trouble with the matrix in the
protection panel.
NOTE:
The unit should not be operated until the cause of the
problem has been determined and corrected.
Refer to specific chapters for more information about
generator.
All right reserved Copyright
Revision : A
Check the proper operation of the purge valve.
Finish heavy fuel purge sequence
Confirm purge
Restart gas turbine heavy fuel when purge finished
Check DC pump
Check electrical circuit
Investigate synchronization system to determine exact
cause of problem.
Refer to the Manufacturer’s documents about the
synchronizing system.
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Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L86T1AALM_AL
74/86T-1A LOCK OUT RELAY TRIP
74/86T-1A Lock out relay coil fault
L86T1AMON_AL
L86TCI
L86TFB_ALM
L86TFD_C
L86TFD_NOFLOW
L86TFD_O
L86TFDLOW_AL
L86TGT1_ALM
L86TGT2_ALM
74/86T-1A LOCK OUT RELAY COIL
FAULT
COMPRESSOR INLET
THERMOCOUPLES DISAGREE
EXHAUST THERMOCOUPLES OPEN
TRIP
FALSE START DRAIN VALVE FAIL TO
CLOSE
FALSE START DRAIN SYSTEM
BLOCKED
FALSE START DRAIN VALVE
FAILURE TO OPEN
FSD VALVE CLOSED AT LOWER
PRESS THAN EXPECTED
GENERATOR DIFFERENTIAL TRIP
CHANNEL 1
GENERATOR DIFFERENTIAL TRIP
CHANNEL 2
74/86T-1A Lock out relay coil fault
Check relay
Check GCP
Check relay
Check GCP
Bad thermocouple signal.
Check thermocouples and wiring.
Trip.
Excessive number thermocouples fault.
Position, connection, short-circuit, cut-off fault.
Check and reconnect thermocouples.
Check the connection and the position.
Check for short-circuit and cut-off.
Check limit switch wiring and good operation. Look for
valve bloquage.
Look for any foreign object or residual fuel in drain piping.
Check valve operation.
Check limit switch wiring and good operation. Look for
valve bloquage.
Valve stucked or limit switch failure
Drain system clogged.
Valve stucked or limit switch failure
Valve spring damaged
Check valve spring.
Electrical trouble with emergency shutdown. Relay 86G
indicate a generator differential.
Electrical trouble with emergency shutdown. Relay 86G
indicate a generator differential.
The unit should not be operated until the cause of the
problem has been determined and corrected.
The unit should not be operated until the cause of the
problem has been determined and corrected.
Investigate problem. The problem should be corrected
before restarting. The Master Reset switch must be
pressed before restarting.
NOTE:
Refer to Manufacturer’s documents and to Control
specification for proper values.
L86TVA_ALM
POSITION IGV FAULT
L86TXT_ALM
The temperature control system has not limited exhaust
temperature within the trip limits.
EXHAUST OVERTEMPERATURE TRIP Temperature control system fault.
Fuel control system fault.
Ventilation system fault.
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
On start-up, the inlet guide vanes are not closed.
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Revision : A
Check the temperature control loop and the fuel control
system.
Check the cooling and ventilation system.
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
L86VGX_ALM
LOSS OF LOAD GEAR COMPT
COOLING FAN
Air fan fault
Motor fault
Power supply fault
L86VL1_ALM
LOSS OF MCC VOLTAGE - LOSS OF
VENTILATION SD
The heat compartment ventilation is faulty.
L86VLTEST_AL
L86VLX_ALM
HEAT VENT DLN COMP TEST
ABORTED
LOSS OF DLN COMPARTMENT
VENTILATION
L86WN1_ALM
WATER INJ. SUCTION PRESSURE
HIGH LOCKOUT
L86WN2_ALM
WATER INJ. DISCHARGE PRESS.
LOW LOCKOUT
L86WN3_ALM
WATER INJ. FLOW HIGH LOCKOUT
L86WN7_ALM
WATER INJECTION LOW FLOW TRIP
WATER
L86WW_ALM
L86WWTD
OFF LINE COMP WW - USE RESET
DISPLAY
LOSS OF FALSE START DRAIN
TEMPERATURE SENSORS NS
OMMO_5_9E_E0858_EN_V3
ACTIONS TO BE TAKEN
Check the load compartment cooling ventilation system
Check the supply of motors 88VG
Check fuses, breakers and protections
Check the mechanical status of the fans and the motors
Check the ventilation system of this compartment (power
supply, motors, fans, electrical circuit...).
Check the position of vent flap.
Check the proper operation of the limit switch 33VL
VL test stopped because of ventilation pressure fault
Check VL or leaks in compartment
Fans fault
Check fans
The water injection mode is automatically deselected.
The water pressure at the inlet of the water injection skid is
too high.
Leakage.
Dirt strainers.
Test valves open.
Isolating valves at the inlet pump closed.
Check for leakage.
Check the closing of the test valves.
Check the status of the strainer.
Check the opening of the isolating valve at the inlet pump.
Check the pressure switch 63 WN_1 (operation and
setting point).
Check the opening of isolating valve of water inlet.
Check for leakage.
Check the pressure.
The water injection mode is automatically deselected.
Check the proper operation of the pressure switch 63
The water pressure at the outlet of the water injection skid is
WN_2.
too low.
Check the proper operation of the water pump.
Check the water injection system.
Check the solenoid valve 20 WN.
The water injection mode is automatically deselected.
Check the flow pickup 77 WN.
The injected water flow is higher than the authorized limit.
Check the water injection system.
Water injection trip.
Check the flow pickup 77 WN.
Water flow low.
Check the limit switch 33 WN_0.
Limit switch fault.
Check the water injection system.
Off line comp WW - use reset display
After sequencing reset by L86WWRST_CPB
TC failure or input card failure
Check input card and check TC integrity
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Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L90TKL_ALM
EXHAUST FRAME COOLING SYS
TRBL - UNLOAD
Exhaust frame cooling sys trouble - unload
Check cooling system
L94BLN_ALM
STARTUP CHECK STOP BATTERY
CHARGER TROUBLE - SD
The 2 batteries charger AC under voltage.
The 2 batteries chargers are faulty.
L94BTL_ALM
HEAT VENT TURBINE
COMPARTMENT SB FAN TEST
FAILED
The turbine ventilation is faulty.
Motor 88BT_1 and 2 fault
L94DP1_ALM
L94DP2_ALM
L94DP3_ALM
L94F1B_ALM
L94F2B_ALM
L94F4B_ALM
L94GLTSD_ALM
L94GLTSU_ALM
G60A CRITICAL FAILURE –TRIP
G60B CRITICAL FAILURE – TRIP
T60A CRITICAL FAILURE – TRIP
FIRE PROTEC AUX/TURB/LOAD
COMPT CO2 RELEASE
FIRE PROTEC BEARING AREA CO2
RELEASE
CO2 RELEASED ZONE #4 ALARM
SHUTDOWN GAS LEAK TEST FAILED
STARTUP GAS LEAK TEST FAILED
STARTUP CHECK STOP LOAD
TUNNEL TEMP HIGH SD
G60A critical failure trip
G60B critical failure trip
T60A critical failure trip
Check the 2 batteries charger AC breaker.
Check voltage magnitude.
Check the proper operation of the batteries charger.
Check the ventilation system of this compartment.
Check fuses, breakers, protections, and supplies.
Check the mechanical status of the fan and the motor in
trouble.
Check the proper operation of each cooling air fan motor
88BT
Check the position of vent flap.
Check G60A
Check G60B
Check T60A
CO2 emission
See alarm : L33CL1_ALM
CO2 emission
See alarm : L33CL1_ALM
See alarm : L33CL1_ALM
Check for leakage
Check for leakage
L94LTTH_ALM
LUBE OIL HEADER TEMPERATURE
SNSR FLT: SHUTDOWN
L94LV_ALM
XFER TO DIST WATER WASH
NEEDED
CO2 emission
Leakage in gas system during shutdown TG
Leakage in gas system during startup TG
Thermocouple faulty
Shutdown TG
2 of the 3 thermocouple are faulty
Temperature of lube oil is too high.
Shutdown TG
Transfer to distillate.
Water wash needed after 15 operating with crude oil.
L94PGT_ALM
GAS FUEL NOZ. PURGE SYSTEM
TROUBLE TRIP
Inter-valve pressure between VA 13_1 and VA 13_2 is high
during start-up: the unit trips.
L94LTH_ALM
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Check thermocouple ttib1
Check the lube oil skid (exhauster, heater, pump).
Check proper operation of thermocouple
LTTH1/LTTH2/LTTH3.
Water wash has to be done, and then operation with crude
oil is authorized.
Check the proper operation and position of the purge
valve VA 13_2.
Check the status of the solenoid valves 20 PG_1 and 20
PG_2.
Check the pressure switch 63 PG_1 (operation and setting
point).
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
L94TC_ALM
TORQUE CONVERTOR DRAIN VALVE
TROUBLE ALARM
Check the proper operation of drain valve and solenoid
The torque converter drain valve is not actuated in the same
valve.
time as the solenoid valve (20 TU_1).
Check the limit switch 33 TC_1.
L94TFD
FALSE START DRAIN VALVE
TURBINE SHUTDOWN
Refer to L86TFD_NOFLOW or L86WWTD
Refer to L86TFD_NOFLOW or L86WWTD
L94VLL_ALM
HEAT VENT DLN COMPARTMENT SB
FAN TEST FAILED
The turbine ventilation is faulty.
Motor 88VL_1 and 2 fault
Check the ventilation system of this compartment.
Check fuses, breakers, protections, and supplies.
Check the mechanical status of the fan and the motor in
trouble.
Check the proper operation of each cooling air fan motor
88VL
Check the position of vent flap.
L94VTSG1_ALM
VOLTAGE MEASURE DOWNSTREAM
52G TROUBLE
The mentioned breaker is open. Consequently the MKVI
can not receive the voltage measurement (upstream 52G)
for the synchronization.
Close the breaker
A issue detected on the fuse or MCB
Inspection of the measurement cable.
Replace the fuse
FUSES OR MMCB FAULT FOR SYNC
VT'S DOWNSTREAM 52L1&2 Q0xL&T
NORMAL STOP PAUSED FOR CBV
ACTUATION
FIRED SHUTDOWN TOO LONG
Normal stop paused for CBV actuation.
Verify bleed valve circuit and switch position of bleed valve
The fired shutdown is too long
L95BT_ALM
HEAT VENT TURB COMPT AIR INLET
FLOW LOW
The turbine ventilation is faulty.
Motor 88BT_1 and 2 fault
For information
Check the ventilation system of this compartment.
Check fuses, breakers, protections, and supplies.
Check the mechanical status of the fan and the motor in
trouble.
Check the proper operation of each cooling air fan motor
88BT
Check the position of vent flap.
L95BTL_ALM
HEAT VENT TURB COMPT AIR INLET
FLOW VERY LOW
See alarm : L95BT_ALM
L94VTSG2_ALM
L94X_S_ALM
L94XZ_ALM
OMMO_5_9E_E0858_EN_V3
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Revision : A
See alarm : L95BT_ALM
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
L95VL_ALM
L95VLL_ALM
L96FG1_ALM
L96FGDIFF_AL
ALARM TEXT
HEAT VENT DLN COMPT AIR INLET
LOW FLOW
HEAT VENT DLN COMPT AIR INLET
LOW FLOW CONFIRMED
HEAT VENT 96FG-1 SENSOR
TROUBLE
GAS FUEL PRESS TRANSMITTERS
DIFF FAILURE
L96FGH_ALM
GAS FUEL PRESSURE HIGH
L96FGL_ALM
GAS FUEL SUPPLY PRESSURE LOW
L96QV1_ALM
LUBE OIL MIST ELIM HIGH
PRESSURE
LAAP4_SENSR
LAAP4AFLT_ALM
LAAP4BFLT_ALM
LAAP4CFLT_ALM
LAAP4FLT_T
ATOMIZING AIR AAP4 XDUCER DIFF
FAULT HIGH
AA MANIFOLD PRESS XDUCER#A
OUT OF RANGE
AA MANIFOLD PRESS XDUCER#B
OUT OF RANGE
AA MANIFOLD PRESS XDUCER#C
OUT OF RANGE
LOSS OF AA MANIFOLD RATIO
PROTECTION - TRIP
OMMO_5_9E_E0858_EN_V3
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
The turbine ventilation is faulty.
Motor 88VL_1 and 2 fault
Check the ventilation system of this compartment.
Check fuses, breakers, protections, and supplies.
Check the mechanical status of the fan and the motor in
trouble.
Check the proper operation of each cooling air fan motor
88VL
Check the position of vent flap.
See alarm : L95VL_ALM
See alarm : L95VL_ALM
Heat vent 96FG-1 sensor trouble
Check heat vent 96FG-1 sensor
Gas fuel pressure high.
Pressure switch fault.
Gas fuel pressure high.
Pressure switch fault.
Gas fuel pressure to turbine has been sensed as low.
Purchaser gas supply fault.
Leakage.
Wiring, supply fault.
Transmitter fault.
Lube oil mist eliminator high pressure
Leakage.
Wiring, supply fault.
Transmitter fault.
The spread between the air pressure transmitters 96AA4A/B/C is too high.
Atomizing air pressure transducer 94AA-4A reading out of
range.
Atomizing air pressure transducer 94AA-4A reading out of
range.
Atomizing air pressure transducer 94AA-4A reading out of
range.
Two atomizing air pressure transducers (96AA-4A/B/C)
readings out of range.
Check the gas fuel system.
Check the pressure switch 63 FG.
Check the gas fuel system.
Check the pressure switch 63 FG.
Check the cause of low supply pressure.
Check the purchaser gas supply.
Check for leakage.
Check the transmitters 96 FG_1.
Check the opening of the shutoff valve.
All right reserved Copyright
Revision : A
Check for leakage.
Check the transmitters 96 QV_1
Check the mentioned sensors, wirings or calibration.
Check the mentioned sensor, wirings or calibration.
Check the mentioned sensor, wirings or calibration.
Check the mentioned sensor, wirings or calibration.
Check the mentioned sensors, check-valves, atomizing air
system or compressor.
Date : 10/2011
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GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
LAAP4STCK_ALM
LAAPRH1_ALM
LAAPRH2_ALM
LAAPRH3_ALM
LAAPRL1_ALM
LAAPRL2_ALM
LAAPRL3_ALM
LAAPRTRP_ALM
LAFPAP_SENSR
LCPD_SENSR
LCPRERR_ALM
LDB_ABRT_ALM
LDB_FAIL_ALM
LDBMD_ON_ALM
LDWATT_ALM
LDWCAL_ALM
LFAGNBA_A
LFALNBA_A
LFPG2_SENSR
ALARM TEXT
ATOMIZING AIR PRESSURE HIGH –
START INHIBITED
ATOMIZING AIR PRESS RATIO HIGH
ON LIQ FUEL
ATOMIZING AIR PRESS RATIO HIGH
ON GAS FUEL
ATOMIZING AIR PRESS RATIO HIGH
ON MIXT FUEL
ATOMIZING AIR PRESS RATIO LOW
ON LIQ FUEL
ATOMIZING AIR PRESS RATIO LOW
ON GAS FUEL
ATOMIZING AIR PRESS RATIO LOW
ON MIXT FUEL
ATOMIZING AIR PRESS RATIO LOW
LOW TRIP
BAROMETRIC PRESSURE
TRANSDUCERS DISAGREE
COMP DISCHARGE XDUCER DIFF
FAULT HIGH
COMP OP LIMIT PROTECTION MAX
CTRL ERROR
UNIT ABORTING DEAD BUS MODE
UNIT NOT READY FOR DEAD BUS
MODE
UNIT READY FOR DEAD BUS MODE
MEGAWATT TRANSDUCER SIGNAL
TROUBLE
GAS FUEL SUPPLY PRESSURE LOW
GCV REG AT NULL COMP
AUTHORITY LIMIT
LCV REG AT NULL COMP
AUTHORITY LIMIT
INTERVALVE PRESSURE
TRANSDUCERS DISAGREE
OMMO_5_9E_E0858_EN_V3
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
Atomizing air pressure too high. Start inhibited
Check atomizing air system.
Atomizing air pressure ratio High on liquid fuel
Check atomizing air system.
Atomizing air pressure ratio High on gas fuel
Check atomizing air system.
Atomizing air pressure ratio High on mixture operation
Check atomizing air system.
Atomizing air pressure ratio Low on liquid fuel
Check atomizing air system, compressor or check-valves.
Atomizing air pressure ratio Low on gas fuel
Check atomizing air system, compressor or check-valves.
Atomizing air pressure ratio low on mixture operation
Check atomizing air system, compressor or check-valves.
Atomizing air pressure ratio very low on liquid fuel.
Check atomizing air system, compressor or check-valves.
One transducer is out
Check transducers
One transducer is out
Check transducers
Inlet heating control valve fault.
Compressor discharge pressure transmitters fault.
Unit aborting dead bus mode
Check operation of bleed heat control valve.
Check the compressor discharge pressure transmitters.
Refer to specific chapter.
Unit not ready for dead bus mode
Unit ready for dead bus mode
Gas fuel supply pressure low
Dead bus mode permissive
Check the power transmitter and change it if its fault
Check the electrical circuit
Refer to specific chapter
The pressure of the transducer is not correct
Check GCV 1 valve
The pressure of the transducer is not correct
Check GCV 2 valve
Inter-valve pressure transducers disagree
Check transmitter settings
Power transmitter fault
All right reserved Copyright
Revision : A
Date : 10/2011
Page :50/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
LFQGUV_ALM
The fuel gas system is in trouble.
Check the fuel gas system and the gas skid.
Flow divider fuel high flow difference
Check flow divider.
For information
Check the regulated constants.
For information
Check the regulated constants.
LPROFILE_ALM
FUEL GAS FLOW OUT OF RANGE
FLOW DIVIDER FUEL HIGH FLOW
DIFFERENCE
SRV OPEN AT 90 % - RISK OF TRIP
ON HIGH EXH TEMP
SRV VLV OPEN AT 95 % - XFER TO
LIQUID FUEL TEMP.
COMP LIMIT FSR BACKUP CONTROL
ACTIVE
GAS FUEL TEMPERATURE TC
TROUBLE
FREQUENCY OUT OF LIMIT FOR GC
TEST. NEED MRST
NGC TEST PB ACTIVATED
GOV TEST ENABLED - SELECT NGC
DISABLED AFTER TEST
OVERFREQ OPERATION AT MAX
TIME. INSPECTION REQU'D
PROFILE TEST PB ACTIVATED
LQEP2N_ALM
DC PUMP ABNORMAL PRESSURE
Motor, pump fault
Transducer fault
LQEP2NFLT_ALM
EMERGENCY LO PUMP DISCH
PRESS TRANSDUCER FAILURE
4-20mA 96QE-2 fault
LTBRGH_ALM
LUBE OIL TEMP BRG DELTA TEMP
HIGH
The delta temperature between turbine bearings fault
Turbine bearings fault
Lube oil fault
Leakage
LTBRGHH_ALM
LUBE OIL TEMP BRG DELTA TEMP
HH
See alarm : LTBRGH_ALM
LFQLDIFF_ALM
LFSGRH_ALM
LFSGRHH_ALM
LFSRCPR_ALM
LFTG_ALM
LGCTESTOF_AL
LNGC_ON_ALM
LNGCPERM_ALM
LOF_LIM_ALM
OMMO_5_9E_E0858_EN_V3
Regulation system fault.
Thermocouples fault.
Check the regulation system.
Check operation of bleed heat control valve.
Check the thermocouples FT_GI_1, 2 and 3 (connection,
wiring and operation).
Indication about NGC test
For information
Indication about NGC test
For information
Indication about NGC test
For information
Total operating time in over frequency greater
than the allowable limit
Indication about profile test
All right reserved Copyright
Revision : A
Turbine shutdown for boroscopic inspection recommanded
Check the mechanical status of the motor and the pump.
Check the motor supply (fuses, breaker, connection)
Check transducer
Check 4-20mA 96QE-2 transmitter (connections, cables.).
Replace transmitter if necessary.
Check the lube oil feed and drain piping
Check turbine bearings and lube oil system
Check thermocouples
Check for leakage
Check the correct circulation of the lube oil.
See alarm : LTBRGH_ALM
Date : 10/2011
Page :51/52
GE Energy
Rev : A
OPERATION AND MAINTENANCE MANUAL
OPERATION
SIGNAL NAME
ALARM TEXT
POSSIBLES CAUSES
ACTIONS TO BE TAKEN
LTGBRGH_ALM
LUBE OIL TEMP GEN BRG DELTA
TEMP HIGH
The delta temperature between generator bearings is fault
Generator bearings fault
Lube oil fault
Leakage
Check the lube oil feed and drain piping
Check generator bearings and lube oil system
Check thermocouples
Check for leakage
Check the correct circulation of the lube oil.
LTGBRGHH_ALM
LUBE OIL TEMP GEN BRG DELTA
TEMP H-H
See alarm : LTGBRGH_ALM
See alarm : LTGBRGH_ALM
LTNHLOSS_ALM
LOSS OF CTRL SPEED SIGNAL
START EMERGENCY LO PUMP
No more speed signal detected on the VPRO cards
LTTH1_ALM
LUBE OIL THERMOCOUPLE #1 FAULT Temperature of lube oil is too high.
LTTH2_ALM
LTTH3_ALM
LUBE OIL THERMOCOUPLE #2 FAULT
LUBE OIL THERMOCOUPLE #3 FAULT
INJECTION TO FUEL RATIO LOW 4
MIN AVG.
INJECTION TO FUEL RATIO LOW.
HOURLY AVG.
FALSE START DRAIN TEMPERATURE
TC#1 OUT OF RANGE
FALSE START DRAIN TEMPERATURE
TC#2 OUT OF RANGE
See alarm : LTTH1_ALM
See alarm : LTTH1_ALM
If ‘’Request injection to fuel ratio’’ is greater than ‘’Actual
injection to fuel ratios’’ during four minutes.
If ‘’Request injection to fuel ratio’’ signal is greater than
‘’Actual injection to fuel ratio’’ signal during hourly average...
Check the status of the control valve.
TC failure or input card failure
Check input card and check TC integrity
TC failure or input card failure
Check input card and check TC integrity
MANUAL TRIP _ REMOTE
The emergency stop pushbutton has been pressed.
Correct abnormality that caused the operator to push the
emergency stop pushbutton.
LWLX4MIN
LWLXHR
LWWTD1_FLT
LWWTD2_FLT
R5E_ALM
OMMO_5_9E_E0858_EN_V3
All right reserved Copyright
Revision : A
Check pickup system
Check electrical circuit
Check VPRO cards
Check the lube oil skid (exhauster, heater, pump).
Check proper operation of thermocouple
See alarm : LTTH1_ALM
See alarm : LTTH1_ALM
Check the status of the control valve.
Date : 10/2011
Page :52/52