PUB 50411
D64RP18 SERIES B1 DIGITAL GROUND FAULT RELAY
Revision 2
May, 2005
Page 5
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+ 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.
External Current Transformer:
External current transformers (CTs) are required for any of the following applications:
-
The size of the power conductors on which the D64RP18 is being applied is too large
for the 1.1” built-in CT.
-
The system voltage on which the D64RP18 is being applied is higher than 660 Volts.
-
The system primary phase current on which the D64RP18 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
30 mA – 6 Amps in 8 steps is the same. The maximum continuous primary phase current is to
be 1000 Amps.
The two secondary terminals of the external CT are to be connected to terminals T1 and T2 of
the D64RP18.
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 D64RP18 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 D64RP18 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 D64RP18 relay is
energized, this can be done without having any adverse effect on the performance of the relay.
Please Refer to Table 1 on the next page. This provides a list of the 4 DIPswitches, the function of
each group, and the values related to each setting. The DIPswitches are numbered from 1 to 4 bottom
to top.
