SPM
Motor Protection
Synchronous motor
protection system
Starting protection, synchronization
and control for synchronous motors
Key Benefits
• Complete asset monitoring - Field Winding temperature and
statistical data
• Access to information - RS485 Communications port and
Modbus RTU Protocol
• Improve uptime of auxiliary equipment - Through I/O
monitoring
Applications
• Starting, synchronizing and protection of collector-ring or brushless-type synchronous motors
Features
Protection and Control
User Interface
• Field application
• 40 Character backlit display for easy viewing of
settings and actual values
• DC field current loss, exciter current loss, DC field voltage
check
• PF regulation, reluctance torque synchronizing
• Function keys allow programming of settings and
viewing of measured values
• Protects motor during start up and in the event of
asynchronous operation
Communications
• Squirrel cage winding overheating protection
• Modbus RTU protocol
• Automatic phase rotation correction
• Auto-loading and incomplete sequence
• Regulator tuning mode
• True RMS metering with DFT filtering
• Optional power factor regulator with adjustable settings
• Power factor & pull out protection (Optional)
• Speed dependent squirrel cage overload protection
• Motor restart protection
Monitoring and Metering
• Motor power factor
• RS485 Serial Communications
• Optional Ethernet communications using Multinet
Serial to Ether converter
EnerVistaTM Software
• State of the art software for configuration and
commissioning GE Multilin products
• Document and software archiving toolset to ensure
reference material and device utilities are up-to-date
• EnerVistaTM Integrator providing easy integration of data
in the SPM into new or existing monitoring and control
systems
• DC excitor amps and voltage
• AC Current
• Exciter field resistance
• Motor run time
• Record of trips
g
Digital Energy
Multilin
445
SPM Synchronous Motor Protection System
200
Protection
2000
This feature trips the motor when field
current drops below the programmed
setpoint after the motor has synchronized.
To utilize this feature a DCCT and Field
Current Calibration Module must be
ordered with the SPM.
40
30
25
20
15
6
5
3.
00
10
8
4
2.
05
An important motor protection function
is preventing squirrel cage winding
overheating during motor starting.
For brushless motors squirrel cage
protection is derived from stator current
inputs. Protection characteristics are
shown in the following graph and the
thermal limit is defined by the Stall Time
and Locked Rotor Amps relay setpoints.
80
60
50
Run Time
Allowable Zero Speed Stall Time
Squirrel Cage Protection
100
3
Reduced Voltage Starting
The SPM can dynamically adjust the motor
stall time to allow successful starting
during reduced voltage conditions.
6
4
1.
2
5
1.0
1.5
1
10
0
The SPM controls starting, synchronizing
and protection of collector-ring or
brushless type synchronous motors.
Motor Protection
DC Field Current Loss Protection
Option
150
20
30
40
50
60
70
80
% Synchronous Speed
200
90 100
150
701761A8.eps
100
Typical cage heating protection characteristics for
collector ring motors.
80
60
50
1500
Restart Protection
B
Stall Time - 10 Sec
Locked Rotor - 6XFLC
C
Stall Time - 2 Sec
Locked Rotor - 6XFLC
The SPM simulates the cooling of a running
motor, updating the relay thermal memory
in one-minute spans. The SPM will also
learn the amount of thermal capacity
required for a successful motor start .
Each new value of the thermal capacity
is compared with the learned starting
capacity required. The SPM will prevent an
attempted restart if the cage winding has
not had sufficient cooling time to allow a
successful start. This element is used to
avoid motor overheating due to frequent
starts.
800
700
600
500
400
300
200
150
Trip Time (seconds)
A
100
90
80
70
60
50
40
B
40
Run Time
Zero Speed Stall Time
900
Stall Time - 30 Sec
Locked Rotor - 6XFLC
30
25
20
15
10
8
Line
6
Voltage
5 50%
4
3
65%
2
80%
1.5
90%
100%
1
10
0
1000
A
20
48
15
SPM
86
94
C
5
Stator
Protection
(469)
4
3
IA C
50P
55
V AC
2
.8 .9 1
1.5
2
3
4
5
6
7 8
10
Trip Current
(Multiples of Programmed Full Load Current)
Calibrator
I DC
37
701762A6.cdr
Typical cage heating protection for brushless
motors.
For collector ring motors the squirrel cage
protection algorithm is based on motor
rotation speed during acceleration. Speed
is determined from the frequency of the
induced rotor voltage across the rotor
discharge resistor.
At less than synchronous speed the
following typical cage heating protection
characteristics are used:
DC
CT
V DC
MOTOR
27
26F
95
48
DC SUPPLY
CLUTCH
COUPLING
94
95
56
LOAD
96
701767A9.cdr
446
446
50
60
70
80
www.GEDigitalEnergy.com
90 100
701760A8.cdr
These curves show how the trip characteristic
of the amortisseur winding protection is
adjusted for reduced voltage starts.
AC BUS
20
6
40
% Synchronous Speed
Functional Block Diagram
30
10
9
8
7
30
ANSI DEVICE NUMBERS
26F Field overtemperature
27 Under voltage
37 Undercurrent or
underpower
48 Incomplete sequence
50P Instantaneous
overcurrent
55 Power factor
Field
application
56
86 Lock out
94 Tripping
95 Reluctance torque
sync. / resync.
96 Autoloading relay
SPM Synchronous Motor Protection System
The Incomplete Sequence protection will
issue a trip if the SPM detects that the
motor has not reached synchronous speed
within the programmable time delay.
Exciter DC Voltage Protection
Exciter voltage protection is available
by connecting the exciter output to the
SPM terminals VE+ and VE- through a
voltage divider network (VDN). This is used
on equipment where the exciters are
energized prior to motor startup.
Field Winding Overtemperature
Option
This function emulates a resistance
temperature device (RTD) on the field
windings. As the ratio of field voltage to
field current increases, the field resistance
increases, indicating an increase in
temperature of the field winding.
Field Winding Overtemperature is only
available when the optional DCCT and
Field Current Calibration Module have
been ordered with the SPM.
Control Features
The SPM offers users advanced control
features such as:
Power Factor (Pull-Out) Protection
The SPM provides pull-out protection for
synchronous motors operating in either
generating or motoring modes. The
SPM provides power factor settings and
displays the measured leading/lagging
power factor. The power factor regulation
option enables field forcing in advance
of a pull-out condition. Motor pull-out
protection is provided by a circuit which
monitors the power factor and has a
built in time delay to prevent inadvertent
tripping on transients. Two modes of pullout protection are available, re-sync mode
and ride-thru mode. These modes will be
initiated if the lagging power factor drops
below the programmed set point, or if a
line current surge occurs which is above
four times the motor full load current.
Re-sync mode operation will cause the
Field Application Relay (FAR) to remove
the motor field excitation. The motor will
continue to run with the field removed for
the programmed power factor delay time.
If re-synchronization does not occur within
this time the trip relay will operate and the
motor will stop.
In ride-thru mode the motor field excitation
is not removed immediately. Instead, the
SPM allows the motor to run for the power
factor delay time. If the power factor dip
or line current surge persists, the trip relay
will operate and the motor will stop.
Main
Contactor
A
B
DC Supply to
Motor Field
MOTOR
C
Field
Contactor
Field
Voltage
Input
SCR
Proportional
Exciter
Current
Input
PF
Detection
PF
Feedback
PF
Regulator
Control
Signal
Starting and Synchronizing
For collector ring motors, the SPM detects
the rotor speed and angle and determines
the correct time to close the field
application relay based on the percent
synchronous slip setpoint . This applies
excitation to the motor field and opens up
the field discharge resistor loop.
For brushless motors, the voltage is applied
to the exciter after a preset programmable
time elapses. Power factor pullout
protection is then enabled. A contact (FCX)
is also provided to signal automatic motor
loading.
Reluctance Torque Synchronizing
Reluctance torque synchronizing is when
a lightly loaded synchronous motor pulls
into synchronization before the rotor poles
are externally magnetized. The SPM’s field
application control responds by applying
excitation if a motor synchronizes on
reluctance torque.
Power Factor Regulation
Power factor regulation is a DC control
signal output used to control a variable
SCR exciter output . This replaces the
standard power factor analog signal
output. This option is not recommended
for brushless applications. The regulator
has five set-points that can be adjusted
while the motor is running to facilitate
regulator tune-up. They are:
• PF setpoint – range from 0.9 lagging,
through 1.0 to 0.0 leading
• Reg output – upper limit of the control
voltage output signal
• Reg gain – adjusted for optimum
regulator performance
• Reg stability – time adjustment to help
compensate for instability
• Reg floor – lower limit of the control
voltage output signal
www.GEDigitalEnergy.com
SPM
PF
Reg
Setpoint Output
Motor Protection
Incomplete Sequence Protection
Reg
Reg
Reg
Gain Stability Floor
701754A5.cdr
Power factor regulation – functional block diagram.
Monitoring and Metering
The SPM provides a number of monitoring
and metering functions including:
SPM Displays and Messages
The SPM has a 40 character LCD display for
programming, displaying trip information,
and monitoring metered values such as
line amperes, field amperes, power factor,
line current, field volts, field current, and
field ohms. The SPM also stores motor run
time and the number and types of motor
trips. Trip, Field Application (FAR) and FCX
relay states may also be monitored.
Self-Tests and Diagnostics
The SPM has built-in test diagnostics
to indicate that the relay is operating
properly prior to start-up. The SPM also
contains a test mode, which includes the
following tests:
• Trip relay contacts
• System test
• Squirrel cage protection test
• Synchronization
• Power factor test
The system test performs a complete
check of the internal memory, input-output
devices and other system functions.
Inputs and Outputs
The SPM offers the user a variety of input
and output solutions:
447
SPM Synchronous Motor Protection System
Field Voltage Input:
closes when the motor reaches full voltage
during a reduced inrush start.
Control Power: The SPM has an AC power
supply with a range from 85 to 265
VAC. If control voltage excursions occur
outside this range, an external stabilizing
ansformer should be used in conjunction
with optional separate power factor
reference voltage inputs.
The induced field voltages VF+ and VF- are
monitored through their connection to the
external discharge resistor via the VDN,
providing instantaneous value of motor
slip.
Exciter Voltage Input:
The VE+ and VE- terminals are connected
to the exciter via the VDN to monitor DC
exciter voltage.
Trip Relay:
The Trip contact is connected to a failsafe
normally open contact. This contact closes
on relay power up and opens on a trip
condition to de-energize the motor.
Power Factor Reference Voltage:
FAR Relay:
The PF reference voltage is derived from
the control power terminals, V1 and V2.
The SPM also has an optional input for
separately powered PF reference voltage,
V1EXT and V2EXT. Effective range 85 to
265 VAC.
Exciter Current Input:
Motor Protection
Analog Output is replaced with a 0 to 10 V
power factor regulation control output. This
signal is used as an input to a variable SCR
exciter.
The field current IE+ and IE- terminals are
connected to the DC field via a DCCT and a
calibration module (ordered separately) to
detect field loss.
The field application relay is a normally
open contact. This contact closes to apply
DC to the motor field to pull motor into
synchronization.
FCX Relay:
Power Factor Analog Signal Output:
Motor Line Current:
The field contactor auxiliary relay picks up
at setpoint time delay after the FAR relay
picks up and is used to signal external
systems to auto load/unload the motor.
A zero to ten volt DC output corresponds
to the motor power factor. Zero volts
represents zero lagging power factor, five
volts represents unity power factor, and
ten volts represents zero leading power
factor. A one volt change corresponds to
an 18 degree phase shift.
Two input terminals, or four for brushless,
are connected to the system current
transformers.
Motor ‘On’ Input:
Accepts a normally closed dry electrical
interlock that opens when the motor is
energized and closes when the motor is
de-energized.
Reduced Voltage Starting Input: Accepts a
normally open dry electrical interlock that
Communications
The SPM is equipped with a rear RS485 port
that can be used for remote programming,
or for connection to a DCS, SCADA, or PLC.
The port supports ModBus® RTU protocol.
The RS485 port baud rate is variable from
300-115,000 bps.
Power Factor Control Signal:
If the relay is furnished with the power factor
regulation option, then the Power Factor
Inf
120 Ohm
Terminating Terminating
Capacitor
Resistor
GND
A3
+
A2
A1
COM Port
RS232
GND
A3
SPM
ENTER
DB9
PERSONAL COMPUTER
ENTER
A1
SPM
ENTER
SCROLL
SYNCRONOUS MOTOR
PROTECTION & CONTROL
SCROLL
SYNCRONOUS MOTOR
PROTECTION & CONTROL
DB9 SIGNALS
1 DCD
2 RX (PC)
3 TX (PC)
4 DTR
5 SIGNAL GND
6 DSR
7 RTS
8 CTS
9 RI
SPM UNIT #1
RS485
POWER
GND
DB9
RS232
120 Ohm
Inf
Terminating Terminating
Resistor
Capacitor
448
+
A2
SPM
SCROLL
SYNCRONOUS MOTOR
PROTECTION & CONTROL
GND
A3
987654321
987654321
GE Multilin RS485
Converter or
Equivilent
A1
+
A2
www.GEDigitalEnergy.com
SPM UNIT #2
SPM UNIT #32
SPM Synchronous Motor Protection System
The EnerVista™ Suite is an industry
leading set of software programs that will
simplify every aspect of using the SPM
relay. Tools to monitor the status of your
motor, maintain your relay, and integrate
information measured by the SPM into
HMI or SCADA monitoring systems are
available.
EnerVista™ Launchpad
EnerVista™ Launchpad is a powerful
software package that provides users
with all of the setup and support tools
needed for configuring and maintaining
GE Multilin products. Launchpad allows
configuring devices in real-time by
communicating using serial, Ethernet, or
modem connections, or offline by creating
setting files to be sent to devices at a later
time. Included in Launchpad is a document
archiving and management system
that ensures critical documentation is
up-to-date and available when needed.
Documents made available include:
• Manuals
• Application Notes
simple-to-use monitoring and data
recording of small systems. Viewpoint
Monitoring provides a complete HMI
package with the following functionality:
• Plug-&-Play Device Monitoring
• Single-Line Monitoring & Control
• Annunciator Alarming
• Trending Reports
• Guideform Specifications
EnerVista™ Integrator
• Brochures
EnerVista TM Integrator is a toolkit that
allows seamless integration of GE Multilin
devices into new or existing automation
systems.Included in EnerVista Integrator
is:
• Wiring Diagrams
• FAQ’s
• Service Bulletins
Viewpoint Monitoring
Viewpoint Monitoring is a powerful yet
Motor Protection
EnerVistaTM Software
• OPC/DDE Server
• GE Multilin Drivers
The CM calibration module is included with the
optional PG2SPM or PG4SPM overtemperature/
current loss accessory package.
Hardware
DC Current Transformer (DCCT)
The optional DCCT detects DC field current.
The DCCT is required for field current and/
or field over­temperature features. 200A
and 400A versions are available. The DCCT
Space Saving Case
The SPM is supplied in a compact S1
drawout case. The drawout case allows the
unit to be removed without disconnecting
the rear terminal wiring.
Voltage Divider Network (VDN)
The VDN is provided to connect the SPM to
field and/or exciter voltages.
works in conjunction with the CM and both
are available in a separate accessory
package. See order code for more details.
The VDN is included as a standard accessory.
DCCT is included with the optional PG2SPM or
PG4SPM overtemperature/current loss accessory
package.
Calibration Module (CM)
This optional accessory provides proper
AC excitation to the DCCT and provides
calibration adjustment to obtain correct
field amp readings. The CM is required for
field current and/or field over­temperature
features.
www.GEDigitalEnergy.com
449
SPM Synchronous Motor Protection System
Typical Wiring
TYPICAL BRUSHLESS MOTOR CONNECTION
T1
B
T2
C
T3
EF1
SYNC
MOTOR
FIELD
A
EF2
NOMENCLATURE
FIELD CURRENT CALIBRATION MODULE
DIRECT CURRENT CT
MAIN CONTACTOR
OVERLOAD RELAY
MOTOR TERMINALS
OPTIONAL ACCESSORIES
DCCT
B1
B2
B3
B4
I2S
I2T I3S
I3T
VOLTAGE DIVIDER
NETWORK (VDN)
EXCITER/FIELD
VOLTAGE
CM
DCCT
M
OL
T1, T2, T3
PHASE CURRENT INPUT
NOTES:
Motor Protection
1) Relays shown with no control power applied to relay
2)
*Trip Relay closed during normal operation
VF+
A18
VF-
A19
VE+
A21
VE-
A20
R
(E+)
(V+)
(E-)
(V-)
FC
FC
GE Multilin
FIELD CONTACTOR
SPM Sync. Protection/Control
CM
7
CM
8
EXCITER
V-
EXCITER
V+
TYPICAL COLLECTOR RING MOTOR CONNECTION
SUPPLY
PHASE C
C
SYNC
MOTOR
T3
FIELD
T2
B
FC
F1
T1
A
FC
F2
FIELD
DISCHARGE
RESISTOR
M
B10
V2
B2
B3
B4
I2S
I2T I3S
I3T
PHASE CURRENT INPUT
FILTER GROUND
g
V+
F
A18
V-
A19
F
VE+
A21
V-
A20
E
G1 CHASSIS GROUND
B8
FIELD
CONTACTOR
VOLTAGE DIVIDER
NETWORK (VDN)
EXCITER/FIELD
VOLTAGE
V1
CONTROL
POWER
REF. VOLT.
B9
B1
FC
(R1)
(+)
( )
(F2)
(E+)
(V+)
(E-)
(V-)
+
Multilin SPM
Synchronous Motor Protection System
-
FCX
A15 N/C
M
A6
A7
FC
FIELD
CONTACTOR
FAR 1
FAR 2
FIELD
APPLICATION
(FAR)
RM
EXCITER
CONTACTOR
RS485
A14 COM
DIGITAL INPUTS
MX
MAIN
AUXILIARY
FIELD
CURRENT
IE -
OPTIONAL
REF. VOLT.
I E+ V1EXT V2EXT
A24 A25 A5
6
450
A11
MX2
A12
NX2
A9
NX1
A10
-
A1
+
A2
EXCITER
M
ON REDUCED VOLTAGE
STARTERS, REMOVE
JUMPER AND CONNECT
A NO. AUX CONTACT
FROM THE FINAL STEP
CONTACTOR HERE.
RM
TO EXCITER
POWER SUPPLY
TO PLC
OR COMPUTER
COMM A3
GND
N+
A17
N-
A16
PF ANALOG OUTPUT OR
PF REG CONTROL SIG
OUTPUT (IF PF
REGULATOR OPTION)
A4
USED FOR SEPARATELY
SUPPLIED POWER FACTOR
REFERENCE VOLTAGE
(OPTIONAL CONNECTION)
5
1
240 VAC
2
3
120 VAC
4
FIELD CURRENT
CALIBRATION
MODULE (CM)
MX1
POWER
FACTOR
OUTPUT
M
OUTPUT RELAYS
START
FIELD
CONTACTOR AUX.
(FCX)
STOP
FCX
A13 N/O
*TRIP
A22 TRIP1
A23 TRIP2
MX
REDUCED
VOLTAGE MONITOR
OL
7
8
BRUSHLESS & COLLECTOR RING - 701756AP.cdr
COLLECTOR RING - 701751.DWG
BRUSHLESS - 701753.DWG
www.GEDigitalEnergy.com
SPM Synchronous Motor Protection System
Features
Front View
GE KEY
Used to enter or exit the different
modes of the SPM. These are
Standby, Test, Statistics, and
Programming modes.
QUICK RELEASE TABS
Used to remove display for easy
access to drawout.
LOCKING PROVISION
A wire lead seal can be used to
prevent unauthorized removal
of relay.
Motor Protection
LCD DISPLAY
Backlit 32 character display for
setpoints, actual values and status.
Programmable auto scan sequence
for unattended operation.
SCROLL KEYS
Used to scroll through the various
menus and change setpoint
parameter values.
ENTER KEY
Used to make a selection or acts
as an enter key.
DISPLAY FUNCTION MENU
Menu of all accessible setpoints
and actual values for easy reference.
CONTRAST DIAL
Lightens or darkens display.
PULLDOWN DOOR
Hides menu when not in use.
Rear View
S1 CASE
Compact S1 rugged metal/bakelite
case. Fits standard cutout.
TERMINAL BLOCK A
RELAYS TRIP: Normally open,
failsafe trip relay.
FAR: Field application
relay.
FCX: Autoloading of the
motor.
INPUTS EXCITER: Exciter voltage
inputs. Connected via
DCCT and CM.
FIELD: DC field voltage
input.
REDUCED VOLTAGE:
Contact input for
reduced voltage starting.
Motor ÒONÓ input.
Exciter current input.
Power Factor reference
voltage (for separately
powered option).
OUTPUTS POWER FACTOR:
0-10 VDC analog signal.
MOTOR LINE CURRENT
2 Phase current inputs.
Accept #8 wire.
CONTROL POWER
85 TO 265 VAC.
701750AG.eps
www.GEDigitalEnergy.com
451
SPM Synchronous Motor Protection System
Technical Specifications
Motor Protection
PACKAGING
Shipping box:
OUTPUTs
PF analog output
Type:
Active
Output:
0 – 10 VDC max @ RL 1K (min load)
Accuracy:
±10% (0.1 v)
Isolation:
36 V VpK
relay contactS
Type:
FAR, TRP
Form A
FCX
Form C
Rated load:
10 A AC continuous NEMA A300
1 A DC continuous NEMA R300
Break:
10A 250 VAC or 30 VDC
Max operating
voltage:
250 VAC
POWER SUPPLY
control power
Input:
85 – 265 VAC @ 48 – 60 Hz
Power:
10 VA nominal
Holdup:
100 ms typical @ 120 VAC
environmentAL
Humidity:
0 – 95% non-condensing
Operating temperature:
-20° C to +70° C
Storage temperature:
-40° C to +85° C
METERING
pHASE current INPUTS
CT primary:
5 – 2000
CT secondary:
5
Conversion range: 0.05 – 6 x CT
Frequency:
50/60 Hz
Accuracy:
@ <2 x CT ±0.5% of 2 x CT true RMS
@ <2 x CT ±1% of 6 x CT true RMS
monitoring
pOWER FACTOR
Range:
0.01 to 1 to -0.01
Time delay:
0.1 – 10 sec
Accuracy:
±5%
INPUTs
FIELD current inputs
CT primary:
5 – 1000
Conversion range:
0.05 – 1 x CT
Accuracy:
± 2%
EXCITER voltage inputs
Conversion:
0 – 350 VDC (prior to VDN)
Accuracy:
±1%
switch inputs (mx AND nx)
Type:
Dry contact
Internal interrogation voltage:
85 – 265 VAC (control voltage)
Ship weight:
approvals
UL:
CSA:
12.50” x 10.50” x 9.75” (L x H x D)
318 mm x 267 mm x 248 mm (L x H x D)
14.25 lbs/6.45 kg
UL listed
CSA approved
type tests
Dielectric strength:
Insulation resistance:
Transients:
Impulse test:
EMI:
Static:
Vibration:
Per IEC 255-5 and ANSI/IEEE
C37.90, 2.0 kV for 1 minute from
relays,CTs,VTs power supply to
safety ground
IEC255-5 500 VDC, from relays,
CTs, VTs,
power supply to safety ground
ANSI C37.90.1 oscillatory
(2.5 kV/1 MHz)
ANSI C37.90.1 fast rise (5 kV/10 ns
Ontario Hydro A-28M-82
IEC255-4 impulse/high frequency
disturbance, Class III Level
IEC 255-5 0.5 Joule 5 kV
C37.90.2 electromagnetic
interference
@ 150 MHz and 450 MHz,
10 V/m
IEC 801-2 static discharge
Sinusoidal vibration 8.0 g for
72 hrs
*Specifications subject to change without notice.
Dimensions
SPM SIDE
SPM FRONT
6.75"
(171)
1.42"
(36)
SPM PANEL CUT-OUT
6.19"
(157)
0.75"
(19)
5.69"
(144)
0.22"
(5.6)
0.22"
(5.6)
(4 PLACES)
0.25" Dia.
(6.3)
SPM Sync. Protection/Control
8.38"
(212)
9.29"
(236)
4.41"
(112)
2.19"
(56)
CL
CL
CUTOUT
4.38"
(111)
8.81"
(224)
4.19"
(106)
PANEL
Inches
(mm)
6.94"
(125)
701752A9.eps
Ordering
SPM
*
*
SPM
PF
SPM: standard starting and protection relay with VDN board
PF: power factor regulation option
used on motors with proportional SCR exciter.
(not recommended for brushless applications)
HHarsh environment conformal coating
Visit www.GEMultilin.com/SPM to:
Accessories for the SPM
• 200A DCCT & Calibration Module
PG2SPM
• View Guideform specifications
• 400A DCCT & Calibration Module
PG4SPM
• Download the instruction manual
MPSPM
• Review applications notes and support documents
VP-1
• Buy an SPM online
• mSPM Retrofit Package
• Viewpoint Monitoring
452
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