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D64RPB125 DIGITAL GROUND FAULT RELAY
As indicated in the General Description, it is recommended that the ground fault TRIP LEVEL setting be kept as close to
the charging current as possible. This will provide maximum safety for operating personnel and equipment protection.
On resistance grounded systems, the TRIP LEVEL setting should be set lower than 20% of the Neutral Grounding
Resistor let-through current.
If the measured ground fault current exceeds the TRIP LEVEL setting, the output relay changes state after the pre-
selected TRIP DELAY time.
2.3
OUTPUT RELAY CONTACT STATE
The output relay contact state is determined by the operating mode selected and the sensing condition of the
D64RPB125 relay. This is shown in Table 2. Use this table when deciding on field connections. Refer to the
CONNECTIONS section.
2.4
INDICATION
There are two LED's on the front of the
GREEN RUN LED
FLASHING
OFF
OFF
ANY OTHER COMBINATION
2.5
RESET
D64RPB125
The
terminals, R1 and R2, for a remote N.O. Test/Reset button. After a trip, the electronics remain in the tripped state until
the ground fault has been cleared and the Reset button has been pressed, or the control voltage is removed from
terminals L- & N+.
It is NOT necessary to press any of the reset buttons after the ground fault has been cleared when the
set in the Auto Reset. In this mode the relay will reset automatically. In the Pulsed mode the relay resets automatically.
However, one of the Reset buttons should be pressed to cancel the flashing red TRIP LED register and restore the
flashing green RUN LED.
2.6
GROUND FAULT TEST
Double clicking any of: the RESET button on the front of the relay; the Reset button on the D64DMCC connected to the
RJ –12 port: or the remote Test/Reset button connected to terminals R1 and R2, invokes a relay test. A simulated
current equal to 1.2 times the trip current set on the Trip Level DIPswitches replaces the measured current. After the trip
delay time set on the Trip Delay DIPswitch has elapsed, the unit should trip and the red TRIP LED will flash. This
procedure tests the functionality of the unit.
After the trip, if the relay operating mode is Non-Failsafe or Failsafe, the output relay will remain tripped and the red
TRIP LED will flash until the button is pressed (Manual Reset)
After the trip, if the relay operating mode is Auto Reset, 3 seconds later the output relay will reset, the red TRIP LED will
turn off, and the green RUN LED will flash.
Revision 1
September, 2004
D64RPB125
RED TRIP LED
OFF
FLASHING
OFF
has a built in momentary RESET button, an RJ-12 port for connection of the D64DMCC, and two
.
Page 7
PUB IB04300001E
CONDITION INDICATED
D64RPB125
OKAY
GROUND FAULT TRIP
NO CONTROL VOLTAGE OR
D64RPB125
DEFECTIVE
CONTROL VOLTAGE TOO LOW OR
D64RPB125
DEFECTIVE
D64RPB125
is
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