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PUB IB04300001E
D64RPB125 DIGITAL GROUND FAULT RELAY
Revision 1
September, 2004
Page 4
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Three seconds after the ground fault current drops below the trip current set point the relay will reset
and the red TRIP LED is turned off.
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If the control voltage is removed by the trip action of the output relay (i.e. it operates the shunt trip of
the breaker that is providing the control voltage), the relay will reset with a short delay and the red
TRIP LED is turned off.
If the ground fault has not been cleared when control voltage is restored, the relay will trip and the red TRIP
LED will light after 500 milliseconds, regardless of the time delay set on the Trip Delay DIPswitch, and the
above cycle will be repeated.
If the ground fault has been cleared when control voltage is restored, the relay will remain reset.
The Auto Reset mode can be used when the application calls for Auto Reset.
Pulsed Operation (manual Reset of red TRIP LED register):
The output relay N.O. contact is closed during a trip pulse and the N.C. contact is open during a trip pulse.
The output relay does not change state when control power is applied to terminals N- & L+.
With control voltage on terminals N- & L+ (green RUN LED flashing), when the measured values reach or
exceed the DIPswitch settings for current and time, the output relay begins 0.5 second pulse trips every 3
seconds and the red TRIP LED flashes. The output relay will continue these 0.5 second pulses until one of the
following conditions is met:
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As soon as the ground fault current drops below the trip current set point the relay will remain in the
reset mode. However the red TRIP LED will continue to flash, registering the trip and the green RUN
LED will remain off. Pressing the Reset button will cancel the register, the red TRIP LED will turn off
and the Green RUN LED will flash.
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If the control voltage is removed by the trip action of the output relay (i.e. it operates the shunt trip of
the breaker that is providing the control voltage), the relay stops pulsing and remains in the reset mode
and the red TRIP LED is turned off.
If the ground fault has not been cleared when control voltage is restored, after 500 milliseconds the relay will
resume the 0.5 second pulsed trips and the red TRIP LED will flash, regardless of the time delay set on the
Trip Delay DIPswitch, and the above cycle will be repeated.
If the ground fault has been cleared when control voltage is restored, the relay will remain reset and the green
RUN LED will flash.
The Pulsed operating mode is designed for applications where the output relay is operating a shunt trip device.
Since the D64RPB125 output relay limits the trip pulse to 0.5 seconds every 3 seconds, this avoids energizing
the shunt trip coil for extended periods. Also, this prevents damage to the internal mechanism of the circuit
breaker in the event that the operator tries to reset the circuit breaker.
Non-Failsafe:
The output relay N.O. contact is closed when tripped and the N.C. contact is open when tripped.
The output relay does not change state when control power is applied to terminals N- & L+.
With control voltage on terminals N- & L+ (Green RUN LED flashing), when the measured values reach or
exceed the DIPswitch settings for current and time, the output relay changes state (trips) and the red TRIP LED
flashes.
If control voltage is maintained on terminals N- & L+ after a ground fault trip, the cover mounted RESET button,
the Reset button on the D64DMCC connected to the RJ –12 port, or the remote Test/Reset button must be
pressed to reset the relay after clearing the ground fault.