PUB IB04300001E
D64RPB125 DIGITAL GROUND FAULT RELAY
Revision 1
September, 2004
Page 9
For remote Test and Reset connect a N.O. momentary contact TEST/RESET button to terminals R1 and R2.
Note
: Terminals R1 and R2 are NOT isolated from the control voltage; terminal R2 is internally connected to terminal
N-.
Connect ac or dc control power to terminals N- and L+. Observe polarity.
In order to meet the Electromagnetic Compatibility (EMC) requirements a chassis bond is required between terminal N-
and the nearest ground point. This distance should be kept to an absolute minimum.
Refer to Figure 1 and Table 2. Decide on the connection of field devices to control voltage and output relay contact
terminals by comparing the desired control of the field devices under various operating conditions.
Figure 1 shows the
D64RPB125
using its built-in current transformers and close coupled to the load side of a circuit
breaker with a shunt trip coil (ST). Pulsed operating mode has been selected. Comparing the operating mode and the
relay contact states in Table 2, it can be seen that the N.O. contact, terminals 13 and 14, would be used for the shunt
trip coil. The
D64RPB125
will give a 0.5 second pulse trip and then reset. The ground fault current is interrupted by
the tripping action of the circuit breaker.
3.3.1
CONNECTING MORE THAN ONE D64RPB125 TO REMOTE TEST/RESET
Up to 5 D64RPB125 relays in the same enclosure may share a common remote Test/Reset button. Connect one
terminal of the button to terminal 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 VERIFY/INDICATOR UNIT
The D64RPB125 has a communication port. This may be used for connection to the D64DMCC Remote Trip and Verify
Unit. This is a modular 6 pole RJ-12 connector carrying 5 Volts dc supply voltage, 3 data signals, and common. The
maximum cable length is 10 feet (3m).
4.1
D64DMCC REMOTE TRIP & VERIFY UNIT
The D64DMCC Remote Trip & Verify Unit is connected to the D64RPB125 by up to 10 feet/3 m of low cost 6-wire
telephone type cable. It provides the following remote indications and functions:
GREEN RUN LED
RED TRIP LED CONDITION
INDICATED
FLASHING OFF
D64RPB125
OKAY
OFF
FLASHING
GROUND FAULT TRIP
OFF
OFF
NO CONTROL VOLTAGE OR
D64RPB125 DEFECTIVE
ANY OTHER COMBINATION
CONTROL VOLTAGE TOO LOW OR
D64RPB125 DEFECTIVE
RESET: To reset relay and LED after a trip. Double Click to invoke Test (See 2.6 Ground Fault Test for a description of
the test procedure).
VERIFY: By pushing the VERIFY button on the Remote Display the D64DMCC will show if the D64RPB125 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 D64RPB125. This indication will remain available for at
least ten hours. The D64DMCC will reset automatically when control voltage is restored.
