PUB 51079
D64RP14 SERIES A2 DIGITAL GROUND FAULT RELAY
Revision 1
May, 2005
Page 5
If control voltage is maintained on terminals N- & L+ after a ground fault trip, the remote
Test/Reset button must be pressed to reset the relay after clearing the ground fault.
If control voltage is removed from terminals N- & L+ while a ground fault is detected, the
output relay resets and the green LED is turned off.
If the ground fault has not been cleared when control voltage is restored, the relay will trip and
the green LED will resume fast blinking after 500 milliseconds, regardless of the time delay
set on the Trip Delay DIPswitch.
If the ground fault has been cleared when control voltage is restored, the relay will remain
reset.
The Non-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.
Failsafe:
The output relay N.O. contact is closed when tripped and the N.C. contact is open when
tripped.
The output relay contacts change state 500 ms after control voltage is applied to terminals N-
& L+.
The output relay trips when either or both of the following conditions occur:
-
The measured values reach or exceed the DIPswitch settings for current and time. In
this condition the green LED changes to fast blinking.
-
Control voltage is removed from terminals N- & L+. In this condition the green LED
does not light.
If control voltage is maintained on terminals N- & L+ after a ground fault trip, the RESET
button must be pressed to reset the relay after clearing the ground fault.
If control voltage is removed from terminals N- & L+ after a ground fault is detected, the output
relay remains tripped.
If the ground fault has not been cleared when control voltage is restored, the relay remains
tripped.
If the ground fault has been cleared when control voltage is restored, the relay contacts will
change state 500 ms after control voltage is applied to terminals N- & L+.
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 D64RP14 is not interrupted by the action of the UV
trip.
External Current Transformer:
External current transformers (CTs) are required for any of the following applications:
-
The size of the power conductors on which the D64RP14 is being applied is too large
for the 1.1” built-in CT.
-
The system voltage on which the D64RP14 is being applied is higher than 660 Volts.
-
The system primary phase current on which the D64RP14 is being applied exceeds
100 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 1
Amp – 10 Amps in 8 steps is the same. The maximum continuous primary phase current is to
be 1000 Amps.
