PUB 50413
D64RPBH13 SERIES B1 GROUND FAULT RELAY
Revision 2
September, 2009
Page 10
2.6
MEMORY AFTER LOSS OF CONTROL VOLTAGE
When control voltage is removed from the D64RPBH13, the LAST TRIP registration will be memorized
(for at least one week). Pressing the Reset pushbutton before restoring control voltage will light either
the green LED or the red LED, green indicating no trip was registered and red indicating the opposite.
The green LED will light continuously, whereas the red LED will give a sequence of short flashes as
described in section 2.4 indicating the cause of trip. Please note that if the D64RPBH13 is operated in
the Failsafe mode (see section 2.2.4), and there was no trip when control voltage disappeared, the
system will still activate the trip register and trip the output circuit breaker at the very moment of losing
voltage. If this is what happened, the red LED will show five consecutive short flashes, meaning ‘relay
was merely activated because control voltage was lost while operating in Failsafe mode’.
The LAST TRIP registration is written to non volatile memory at the moment the D64RPBH13 powers
down. This way the trip code is accessible -by pressing the RESET button- even without control voltage
present, which is particularly helpful when the tripping of the relay also causes control voltage to
disappear. However, there is a very limited amount of backup power stored internally to support this, so
the number of red flashes must be verified at the very moment when the button is being pressed.
The backup power will hold for days as long as it is not exhausted by the pressing of the button.
3.
INSTALLATION INSTRUCTIONS
Place the D64RPBH13 in a clean dry enclosure. Try to keep the exposure to mechanical shock and
vibration to a minimum. The internal electronics have been encapsulated in epoxy to improve the
performance in high vibration environments.
Locate the relay close to the isolating device (circuit breaker or contactor) which is protecting the circuit
being monitored.
Provide maximum clearance between both the D64RPBH13 and the C311CT and any strong magnetic
flux producing devices such as power transformers, autotransformers, control transformers, reactors,
and high power conductors and buswork.
3.1
MOUNTING
Refer to Figure 2 for mounting dimensions of the D64RPBH13 relay. It is designed for through-the-door
or rear panel mounting.
3.1.1
THROUGH-THE-DOOR
Four 4 mm (5/32") holes in the flanged cover of the relay permit bolting to the door using suitable
hardware.
A 102 mm high (4.0") x 72 mm wide (2.85") cut-out is required in the door.
Remove the pull-apart terminal block from the relay to permit the relay to be inserted through the cut-
out. From the front of the door, insert the relay through the cut-out. Mount the relay cover to the front of
the door using the customer supplied mounting hardware (four bolts, washers and nuts).
3.1.2
REAR PANEL
The relay may be mounted with either mounting screws or 35 mm DIN rail.
Two #8-32 x 3/4" (M4 x 20) mounting screws are required for screw mounting.
For DIN rail mounting, the rail should be bolted to a flat surface. Install the DIN rail vertically. Allow at
least 1" (25.4 mm) of rail to extend beyond each end of the relay. Install a stop block on the DIN rail 1"
(25.4 mm) from the bottom to keep the D64RPBH13 in position. Secure the relay to the DIN rail
ensuring the white release latch at the left side of the relay engages the rail.
