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PUB 50412
D64RPB100 SERIES B1 DIGITAL GROUND FAULT RELAY
Revision 3
April, 2008
Page 5
The Failsafe mode can be used when the output relay is operating undervoltage devices.
This includes: contactor coils; starter coils; and circuit breakers equipped with UV trip
coils provided that the control voltage to the D64RPB100 is not interrupted by the action
of the UV trip.
Pulsed (Trip) Auto Reset:
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 1 & 2.
With control voltage on terminals 1 & 2 (green RUN LED flashing), the output relay
changes state (trips) and the red TRIP LED lights when the measured values reach or
exceed the DIPswitch settings for current and time. The output relay will remain tripped
until one of the following conditions is met:
-
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. This is, in effect, pulsed
Auto Reset.
-
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. This is, in
effect, Auto Reset.
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 DIPswitches, 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 Pulsed Trip Auto Reset mode can be used when the application calls for Auto Reset.
The Pulsed Trip Auto Reset mode is designed for applications where the output relay is
operating a shunt trip device. The D64RPB100 resets automatically 3 seconds after the
ground fault current is interrupted by the tripping action of the circuit breaker. The output
contact to the shunt trip coil opens. This prevents damage to the internal mechanism of
the circuit breaker in the event that the operator tries to reset the circuit breaker. When
the control voltage to the D64RPB100 is interrupted by action of the shunt trip, the
D64RPB100 resets with a short delay.
External Current Transformer:
A Current Transformer with the two secondary terminals of the external CT connected to
terminals T1 and T2 of the D64RPB100.
External current transformers (CTs) are required on applications where:
-
The ground fault trip current setting levels must be 30 mA – 9 Amps, plus any of
the following:
-
The size of the power conductors on which the D64RPB100 is being applied is
too large for the 1.81” built-in CT.
-
The system voltage on which the D64RPB100 is being applied is higher than 660
Volts.
-
The system primary phase current on which the D64RPB100 is being applied
exceeds 200 Amps continuous.
Any Eaton’s Cutler-Hammer C311CT with 500:1 ratio may be used when the above
requirements dictate the use of an external CT. The ground fault trip current setting range
of 30 mA – 9 Amps is the same. The maximum continuous primary phase current is to be
1000 Amps.