EARTH LEAKAGE RELAY
X70DD – X72DD – X96DD
WIRING DIAGRAM
OPERATING MANUAL
Ipm0131.9 - Edition 02.10
FRER Srl - V.le Europa, 12
I - 20093 - Cologno Monzese (Mi)
ITALY - www.frer.it
Tel.: +39.02.27302828
Fax: +39.02.25391518
frerexport@frer.it
1. SAFETY PRECAUTIONS
X70DD - X72DD – X96DD
OVERALL DIMENSIONS
The following general safety precautions must be observed during all phases of installation and operation of this instrument.
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Installation and operation of this instrument can be performed by qualified personnel only and according to the relevant
Normatives.
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Servicing can be performed at Factory only.
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Before installing the instrument make sure that the housing is not damaged, otherwise the unit must be rejected and
returned to the Factory for servicing.
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Ensure that the line and auxiliary power supply are switched off before connecting the instrument to the circuits.
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Wiring diagrams must be respected according to the required model.
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Make sure to operate the instrument according to the technical specifications as listed in this Manual.
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Do not operate the instrument in an explosive atmosphere and in presence of flammable liquids or vapours.
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The environmental operating conditions must be in the range as specified in this Manual.
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Never attempt to open the instrument's housing for any reason.
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Water or other liquid cleaners must be avoided.
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Failure to comply with these precautions and with the instructions given elsewhere in this Manual violates safety standards
of design, manufacture, and intended use of this instrument.
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FRER assumes no liability for the Customer's failure to comply with these requirements.
NOTE: The contents of this Manual are subject to change without prior notice as a result of improvements in performances and functions.
Should you have any questions, please contact FRER srl.
2. DESCRIPTION
The Earth Leakage Relay is a microprocessor based electronic protection device designed to recognize low level leakage or unbalanced
currents, due to insulation loss on conductors or equipment that must be protected.
The fundamental feature is to allow preventive control of the system's insulation with continuous display of the earth leakage current
value of motors, transformers and power systems.
The measure of the leakage currents is obtained by the use of the ring-type current transformer FRER cod.TDC… or TDA…. All circuit
conductors to be protected shall go through the CT.
The relay is designed with a microprocessor in order to satisfy all the protection requirements and guarantee utmost reliability.
The microprocessor carries up several functions, such as:
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Digital display of earth-leakage or unbalanced currents from 0.02 A to 12.0 A.
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Independent digital current adjustments for alarm and tripping from 0.03 A to 10.0 A.
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Independent digital time adjustments for alarm and tripping, from 0.03 to 5 Sec.
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Control through two (2) output operational relays: alarm and tripping.
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Visual indication and storage of the maximum fault current for later viewing. The memory doesn’t lose the value after a power
loss.
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Output relays test.
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Local or programmable automatic reset. The automatic reset is lockout after three (3) automatic operations in a period of time less
than 9 minutes.
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Continuous control of wiring connection between the relay and the CT.
The wide current range allows easy selection of precise trip current values, in order to maintain the value of the so called contact voltage
below 50V, as required by the CEI 64-8 standard.
The relay, thanks to its internal filtering, is immune to external disturbances. Its function is also guaranteed with alternate sinusoidal and
continually pulsating differential currents, which are applied abruptly or rising slowly (type A according to IEC 755 Standard).
3. INSTALLATION
The relay should be installed according the characteristics of humidity and temperature that has been designed to work in. To minimize
noise pickup and interference the relay should be placed away from high current conductors or sources of strong magnetic fields. The
X70DD relay is designed to be installed over a din rail of 35mm (see last page).
4. WIRING CONNECTION
In order to do all the connections, follow the diagram on the last page. The following points will explain in more detail.
4.1 Power Supply
The 115 Vac (-15%,+10%) 50-60 Hz supply voltage must be connected to terminals 20 – 22; the 230 Vac (-15%,+10%) 50-60 Hz supply
voltage must be connected to terminals 20 – 21 (available on request also 24 - 48 - 110 - 220 Vdc).
When installing the meters, a protection of the voltage input terminals and of the auxiliary supply terminals must be carried out
by means of fast or ultrafast fuses with rated current at 1A or 2A, rated voltage suitable to the system voltage, and breaking
power adequate to the short-circuit current available at the connection point (the types 10x38, with ceramic body, rated voltage at 500V
or at 660V, gG or FF characteristic and breaking power at 100KA are normally suitable for this application).
4.2 CT Connection
The terminal blocks 1 and 2 should be connected to the measuring windings of the CT FRER, code TDC… or TDA… by twisted pair of
2
cables. The used wire should not be less than 1 mm (17 AWG) and the distance should be as short as possible (max. 10 mt. of pair
wire).
NOTE: The CT wiring should be placed away from high current and voltage conductors or sources of strong magnetic fields, to minimize
noise pickup and interference on the relay. If the wires have only one route, separate the wires with some metallic element. If shielded
cables are used connect shield only to system ground.
4.3 Output contacts connections
The outputs consist of two (2) mechanical relays with one changeover contact. Notice, above the terminals, the drawing regarding the
contacts position when the device is not powered. The TRIP relay will activate when the earth leakage current overcome the trip
threshold for the specified delay time. The ALARM relay will activate instantaneously when the relay is connected to line power, and it
will be deactivated when:
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The earth leakage current overcome the alarm threshold for the specified delay time.
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Wrong functionality inside the relay occurs.
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The auxiliary voltage is cut off.
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CT wiring interruption occurs (only if programmed).
NOTE: Using the contacts for control of inductive loads in Vac (coils of relays, contactors, solenoids), is necessary to limit the over
voltage connecting a R/C group in parallel to the inductor. If it works in DC, a diode in anti-parallel should be connected. The internal
relays are isolated 4 kV between contact and coil.
5. FUNCTIONS AND SIGNALING
Each time the relay is powered, it makes an internal test and performs a protection function within 300 mSec. The display will show the
measured current (normal operative condition) after about 5 Sec.
NOTE: In the case there is a wire interruption with the CT, the message “F.co” will appear on the display.
The relay presents three (3) principal modes:
Measure Mode: This is the normal work mode, and is the one that the relay returns if no key is pressed.
Scan Mode: In this mode, the user sees the setup of the relay. It is reached, from Measure Mode, by pressing the “▲” (SCAN) button.
Programming Mode: This mode allows the user to change the setup of the relay. It is reached in the Scan mode by pressing the “E”
button until the SCAN/PROG led blinks.
The functions are explained by the leds, display and buttons, as follows:
DISPLAY: In the (3) digit display, the user can observe all the data of the relay
LED "SCAN/PROG": Indicates the user is in the scan mode. In scan mode the user can see or modify all the programmed parameters
of relay. If this led blinks means that the user is in programming mode and is editing the showed value.
LED "ALARM": The led "ALARM" turned on, shows that the current has risen above the alarm setpoint and the programmed alarm time.
The respective contact has activated the alarm.
LED "TRIP": The led "TRIP" turned on, shows that the current has risen above the trip setpoint and the programmed trip time. The trip
contact has tripped the circuit breaker.
LED "TIME": It shows that the value readed on the display is a time in mSec.
“▲” (SCAN) PUSH-BUTTON:
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In measure mode: Allows the user to enter in the scan mode.
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In scan mode: It allows to move through the different parameters.
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In program mode: It is used for editing the value of the setpoint. (see programming).
“▼” (DISPLAY) PUSH-BUTTON:
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In measure mode: This push-button allows to do a test of the leds & display turning them on.
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In scan mode: It allows to move through the different parameters. To return at “measure mode” push the button until all leds and
display are on.
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In program mode: It is used for editing the value of the setpoint. (see programming).
"RESET" or "E" (ENTER) PUSH-BUTTON:
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In measure mode: It is used to reset from a fault condition.
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In scan mode: If pressed for more than 2 seconds, the relay enters in program mode and it is possible to edit the value on the
display. (see programming). If the value showed on the display is the last tripped current, pressing the button for more than 2
seconds such value is resetted.
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In program mode: It is used to store the value of the setpoint and to return to Scan Mode. (see programming).
"TEST" PUSH-BUTTON: This push-button allows to do the output contacts test.
NOTE: Be careful to the load connected to the output contacts. If pressed for more than 5 seconds, the output contacts will actuate, and
will stay on that position until the push-button is released. Depending on the programming, this push-button can be disabled.
5.1 SCAN / PROGRAM MODE
In order to access in scan mode, press the “▲” (SCAN)” push-button. The SCAN/PROG led will turn on.
When the relay is in scan mode, there is only one procedure in order to modify the value of a setpoint:
Step 1: Press the “E” “RESET” push-button until the SCAN/ PROG led blinks.
Step 2: Use the arrows push-buttons to select the value.
Step 3: Press the “E” “RESET” push-button to set the value.
After pressing the “▲” (SCAN)” push-button, the relay will show the following parameters:
LAST TRIP CURRENT
On the display will appear the last tripped current when the breaker opened the faulted line. If the user wish to clean the value, press the
“E” push-button (more than 2 sec) until the display shows zero (0).
Press the “▲” (SCAN)” push-button to continue.
TRIP CURRENT
The display will show the TRIP current. The LED TRIP will be on. If change of the value is needed, please follow the (3) programming
steps above mentioned. Press the “▲” (SCAN)” push-button to continue.
TRIP DELAY TIME
The display will show the value (in sec) of the trip delay time. The LED TRIP and TIME , will turn ON. If change of the value is needed,
please follow the (3) programming steps mentioned.
Press the “▲” (SCAN)” push-button to continue.
ALARM CURRENT
The display will show the ALARM current. The LED ALARM will be on. If change of the value is needed, please follow the (3)
programming steps mentioned. Press the “▲” (SCAN)” push-button to continue.
ALARM DELAY TIME
The display will show the value (in sec) of the alarm delay time. The LED ALARM and TIME , will turn ON. If change of the value is
needed, please follow the (3) programming steps above mentioned. Press the “▲” (SCAN)” push-button to continue.
RESET
The display will show the reset status, “Loc” for local reset or “Aut” for automatic reset:
Automatic: This setting has an automatic reset time of (2) seconds (only for TRIP). If (3) successive trips in less than 9 min occurs, the
relay lock out the automatic reset, and local reset is required. However the led TRIP remains on and must be turned off pushing “E”.
Local: The reset is done by pressing the “E” (RESET) push-button (for ALARM and TRIP) or (for X70DD only) by a remote contact
connected with the terminal blocks 87 and 88.
If change of the value is needed, please follow the (3) programming steps above mentioned. Press the “▲” (SCAN)” push-button to
continue.
OUTPUT CONTACT TEST
The display will show the test status:
“P.of”: This setting indicates that no test will be done when the “T” (TEST) push-button is pressed.
“P.on”: This setting indicates that after pressing the “T” (TEST) push-button for more than five (5) seconds, the output contacts TRIP
and ALARM will activate.
If change of the value is needed, please follow the (3) programming steps mentioned. Press the “▲” (SCAN)” push-button to continue.
CT WIRING FAULT
This parameter establishes the method used to warn the CT wiring fault:
“F.of”: This setting indicates that the relay will warn only by the display message “F.co”.
“F.tr”: With this configuration the TRIP relay will be activated when the fault occurs.
“F.AL”: With this configuration the ALARM relay will be deactivated when the fault occurs.
“F.At”: With this configuration the ALARM relay will be deactivated and TRIP relay will be activated when the fault occurs.
If change of the value is needed, please follow the (3) programming steps mentioned. Press the “▲” (SCAN)” push-button to continue.
NOTE: In all cases of CT wiring fault, the display will always shows the message “F.co”.
OUTPUT CONTACT TYPE
This parameter defines that the TRIP contact is going to work as latched or in pulse mode, the LED TRIP will turn on and LED TIME will
flash.
“t.LA”: When the fault occurs, the TRIP contact will actuate and remain latched until RESET
“t.P1 to t.P9”: When the fault occurs, the TRIP contact will be active for a determinated time: P1= 100ms, P2= 200ms, P3= 300ms, P4=
400ms, P5= 500ms, P6= 600ms, P7= 700ms, P8= 800ms, P9= 900ms. (ms=milliseconds).
If change of the value is needed, please follow the (3) programming steps mentioned.
Press the “▲” (SCAN)” push-button to exit.
6. TECHNICAL SPECIFICATIONS
Supply voltage: 115/230 Vac -15%, +10% 50/60 Hz – on request 24 - 48 - 110 - 220 Vdc.
Max. Power Consumption: 3VA or 3W
Rated Frequency Fn: 47 to 63 Hz
CT (Current Transformer) ratio: primary / secondary measuring ratio: 1/500
Measure Input resistance: 20 ohm
Measurement range: 0.02 – 12.0 A
Trip & Alarm current adjustment:
0.03 A to 10.0 A Repeatability: ± 2%
Accuracy: ±5% ±1 digit
Delay Time Adjustment:
0.03 to 5 sec in steps of 10 mSec Accuracy: 5% or ±10 mSec
Third Harmonic Filter:
For 150 Hz attenuation = 88%, for 180 Hz attenuation = 93%
CT wiring Test: Continuous.
Outputs: 2 outputs changeover with 5A 250 Vac resistive load.
Operational Temperature: 0 to 50 °C.
Storage Temperature: -20 to + 70 °C.
Relative Humidity: <= 90% (non-condensing)
Burn In Test: 50ºC for 48 hours.
Dielectric Withstand Voltage: 2 KV 60 sec.
Reference Standard: IEC60947-2
Construction: according to standards VDE, UL, CEI.
Terminal Block: X70DD and X72DD: fixed connection terminals with a capacity of 5A, 250 Vac with cable section 4 mm2 (12 AWG)
X96DD: faston 6.3 x 0.8 mm
Case: UL 94 V-0 self-extinguish thermoplastic material, with protection IP54 (mod. X72DD – X96DD), IP40 (mod.X70DD).