PUB 50412
D64RPB100 SERIES B1 DIGITAL GROUND FAULT RELAY
Revision 3
April, 2008
Page 11
Either side of the secondary circuit on the interposing CT may be grounded where required by
electrical regulations. This ground connection should be made to the same grounding point as
terminal 3 of the D64RPB100. This will avoid ground loops and nuisance tripping.
3.5.1 CONNECTING MORE THAN ONE D64RPB100 TO REMOTE TEST/RESET
Up to 25 D64RPB100 relays in the same enclosure may share a common remote Test/Reset
button. Connect one terminal of the button to terminal T2/R2 of
one
of the units, and connect the
other terminal of the button to terminals R1 of
all
the units in parallel.
4.
COMMUNICATIONS AND OPTIONAL EXTERNAL DISPLAYS/INDICATOR UNITS
The D64RPB100 has a communication port. This may be used for connection to the D64D1
remote display, the D64D2 Remote Indicator Unit, or for other options such as a computer
interface or a custom communications module. This is a modular 4 pole RJ-10 connector carrying
7.5 Volts dc supply voltage, 2 data signals, and common. The supply voltage is short circuit
protected. The maximum cable length is 30 feet (10m).
4.1
D64D1 DIGITAL DISPLAY UNIT
The D64D1 Digital Display Unit is connected to the D64RPB100 by up to 30 feet/10m of low cost
4-wire telephone type cable. It provides the following remote indications and functions:
•
Continuous reading of actual ground fault current, employing auto ranging.
•
Display of the pre-trip ground fault current, after a trip has occurred (flashing display).
•
Display of the trip current setting, after a Test Trip has been activated.
Green RUN LED
Flashing:
Okay
Off: No control voltage, control voltage too low, or D64RPB100 defective
Steady on:
Control voltage too low or D64RPB100 defective
Red TRIP LED
Off:
No trip
Steady on:
Trip
RESET: To reset relay and LED after a trip.
TEST: (See 2.6 Ground Fault Test for a description of the test procedure).
The RESET button must be held pressed before the TEST is pressed to invoke the test
procedure. The function of this button can be enabled/disabled by inserting the interconnecting
cable from the D64RPB100 relay into one of two sockets, TEST ON or TEST OFF, on the right
side of the display. If the feature is disabled and the RESET and TEST buttons are pressed, the
display shows ‘OFF’ for 1 second, and the red ‘G/F TRIP’ LED on the display flashes twice.
VERIFY: By pushing the VERIFY button on the Remote Display the D64D1 will show if the
D64RPB100 to which it is connected tripped due to a ground fault prior to loss of its control
voltage by lighting the red TRIP LED. If there was no ground fault trip prior to loss of control
voltage the green RUN LED will light. This feature is especially useful when pulse tripping a
breaker that also supplies control voltage to the D64RPB100. This indication will remain available
for at least ten hours. The D64D1 will reset automatically when control voltage is restored.
The Numerical LCD window displays actual ground fault current in Amps. When a 5000:5 ratio
interposing CT is used, all displayed values are to be interpreted as kAmps rather than Amps.
