PUB 50411
D64RP18 SERIES B1 DIGITAL GROUND FAULT RELAY
Revision 2
May, 2005
Page 7
2.4
OUTPUT RELAY CONTACT STATE
The output relay contact state is determined by the operating mode selected and the sensing condition
of the D64RP18 relay. This is shown in Table 2. Use this table when deciding on field connections.
Refer to the CONNECTIONS section.
2.5
INDICATION
There is one green LED on the front of the D64RP18:
Off:
No control voltage or D64RP18 defective
Slow Flashing: Okay, control voltage on
Fast Blinking:
Ground Fault Trip
Steady On:
Control voltage too low or D64RP18 defective
2.6
RESET
The D64RP18 has two terminals R1 and R2 for a remote N.O. 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 the N.C. remote button after the ground fault has been cleared when the
D64RP18 is set in the Pulsed Trip Auto Reset mode. In this mode the relay will reset automatically in 3
seconds.
2.7
GROUND FAULT TEST
Double clicking the external 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 green LED will fast blink. This procedure tests the functionality of the unit.
After the trip, if the external button is N.O. (the trip mode is Non-Failsafe), the output relay will remain
tripped and the green LED will fast blink until the button is pressed (Manual Reset)
After the trip, if the external button is N.C. or there is a jumper on terminals R1 and R2 (the trip mode is
Pulsed Trip Auto Reset), the output relay will reset and the green LED will revert to slow flash 3
second after the test was invoked (Auto Reset)
A “Test Record Form” is included in this instruction manual. This form provides spaces to record the
date the test was performed and the results. Those in charge of the building’s electrical installation
should retain the form in order to be available to the authority having jurisdiction.
3.
INSTALLATION INSTRUCTIONS
Place the D64RP18 in a clean dry enclosure. Try to keep the exposure to mechanical shock and
vibration to a minimum, even though 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) that is protecting the circuit
being monitored. If using an external CT keep the distance between the relay & CT as short as
possible.
Provide maximum clearance between the D64RP18 (and the external CT if being used) and any
strong magnetic flux producing devices such as power transformers, autotransformers, control
transformers, reactors, and high power conductors and buswork.
CAUTION: For reliable ground fault detection by the D64RP18 use one CT configuration only: Built-in
CT; or, External CT (i.e. do not pass power conductors through the built-in CT when using an
external CT.)
3.1
MOUNTING
