PUB 50412
D64RPB100 SERIES B1 DIGITAL GROUND FAULT RELAY
Revision 3
April, 2008
Page 4
2.
OPERATION
2.1
GLOSSARY OF TERMS
Manual Reset:
The RESET pushbutton on the front of the D64RPB100 or, the remote TEST/RESET
pushbutton connected to terminals R1 & R2, must be pressed once to reset the output
relay after a trip, providing the ground fault has been cleared or the measured values are
within the preset limits.
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 1 & 2.
With control voltage on terminals 1 & 2 (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 lights.
If control voltage is maintained on terminals 1 & 2 after a ground fault trip, the RESET
button must be pressed to reset the relay after clearing the ground fault.
If control voltage is remove from terminals 1 & 2 while a ground fault is detected, the
output relay resets 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 DIPswitches.
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 1 & 2.
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 red TRIP LED lights.
-
Control voltage is removed from terminals 1 & 2. In this condition the red TRIP
LED does not light.
If control voltage is maintained on terminals 1 & 2 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 1 & 2 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 1 & 2.
