PUB IB04300001E
D64RPB125 DIGITAL GROUND FAULT RELAY
Revision 1
September, 2004
Page 5
If control voltage is removed from terminals N- & L+ while a ground fault is detected, the output relay resets
and the red TRIP LED turns off.
If the ground fault has not been cleared when control voltage is restored, after 500 milliseconds the relay will
trip and the red TRIP LED will resume flashing, 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 milliseconds 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
red TRIP LED flashes.
-
Control voltage is removed from terminals N- & L+. In this condition the green RUN LED turns off.
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.
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 in the tripped
condition, regardless of the time delay set on the Trip Delay DIPswitch. The red TRIP LED flashes.
If the ground fault has been cleared when control voltage is restored, the relay contacts will change state 1
second after control voltage is applied to terminals N- & L+ and the green RUN LED flashes.
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 D64RPB125 is not interrupted by the action of the UV trip.
Chassis Ground
Chassis ground is the ground to which all of the non-current carrying metal equipment is connected/bonded.
Typically, equipment grounding is provided by means of a ground bus. A solid connection is to be made from
terminal N- of the D64RPB125 to the nearest chassis ground to ensure the relay complies with the specified
Electromagnetic compatibility (EMC) standards.
2.2 DIPSWITCH
SETTINGS
FOR MAXIMUM SAFETY THE SETTINGS DESCRIBED IN THIS SECTION SHOULD BE MADE WITH CONTROL
VOLTAGE REMOVED FROM THE D64RPB125 RELAY.
The DIPswitches are mounted inside of the relay and are accessible through the front cover. It is recommended that all
of the DIPswitches be set at one time.
Should it be necessary to make changes to the DIPswitch settings when the D64RPB125 relay is energized, this can be
done without having any adverse effect on the performance of the relay.
Please Refer to Table 1. This provides a list of the 8 DIPswitches, the function of each group, and the values related to
each setting. The DIPswitches are numbered from 1 to 8 left to right.
