GE Industrial Solutions EntelliGuard G Digital Test Kit - Manual (Page 5)

DEH-4568A Rev. 02 (08/09)
1.4 Detailed Operation
Cables: The Test Kit is provided with a 15-pin trip unit
cable that connects to the side (EntelliGuard trip unit
port) of the test kit and to the front of the trip unit. This
cable allows the test kit to power the trip unit and to
apply signals for the test functions provided below.
Note: In some cases removal of the screws from the
15 pin connector on the trip unit side are required.
In addition, the test kit is provided with a 9-pin cable that
connects to the top (serial communication port) of the test
kit to support Modbus communication. Modbus
communication requires a computer, Modbus software
and configuration to be used. See the EntelliGuard Trip
Unit Manual (DEH-4567) for Modbus register information.
Contact your GE Account Manager for availability of
software specifically for use with the EntelliGuard TU.
Powering the trip unit: The test kit can be used to
power the trip unit as follows:
• Connect the EntelliGuard Trip Unit cable to the trip unit.
• Press the Power button to power-on the trip unit.
The power ON LED will be lit. The trip unit can also be
powered by external 24V that is wired to the secondary
disconnect of the circuit breaker and is powered when
sufficient current is flowing through the circuit breaker.
The test kit can be used to power the trip unit in cases
where current is flowing through the circuit breaker but the
current is insufficient to power the trip unit. Applying
power to the trip unit from the test kit while the trip unit is
powered from another source will not damage the trip
unit. When Power is supplied to the trip unit, the
bright backlight LCD screen will be lit.
Trip Breaker Test: Pressing the Trip Breaker button
signals the trip unit to trip the breaker by firing the flux
shifter. This can be used to verify that the flux shifter is
connected and installed properly and that the flux shifter
trips the breaker mechanism. This test is performed by
having the test kit connected and the breaker closed and
then pushing the Trip Breaker button. The breaker will
then open. No events will be stored in the event log
and no bell alarm will operate.
If trip unit fails to trip the breaker in this test, remove the
breaker from service and refer the trip unit and breaker to
an authorized GE service representative.
Ground Fault & Overload Operation: In order to perform
the Ground Fault test, Short Time and Instantaneous
pickup must be set to 5X or greater. Record all
settings prior to making changes. To perform an
overload test the Ground Fault needs to be disabled
through the test kit. See the following page for
detailed instructions on test set-up.
Ground Fault Disable: This feature should only be
used when testing the breaker with the breaker
disconnected from the source (upstream breaker or
switch open or breaker racked out). This test is used when
performing primary injection testing of overcurrent or short
circuit protection features on 1 phase of the circuit
breaker. This single-phase current will appear as a
ground fault to the trip unit due to the phase unbalance
(only 1 phase current applied). The ground fault disable
feature will allow this testing to occur without the unit
tripping on ground fault. Pressing the Disable Ground Fault
button signals the trip unit to temporarily disable the GF
protection.
WARNING: When using the EntelliGuard Digital
Test Kit to defeat the Ground Fault function of
EntelliGuard Trip Units the ground fault protection of
the trip unit will not be active. Power to the breaker
should be removed prior to using this feature. Before
applying load to the breaker, ensure that the Disable
GF LED is OFF or the Test Kit is disconnected from
the trip unit.
Failure to follow this procedure can result in
deactivation of the Trip Unit GF protection.
Phase Current: This feature should only be used when
testing the breaker with the breaker disconnected from
the source (upstream breaker or switch open or
breaker racked out). The phase current button is
used to apply a fixed voltage to the sensing circuitry
for each phase. This will test the measurement circuitry of
the trip unit. If the unit is working properly then 100A ±
10A will appear for each phase on the trip unit
METER display. If your trip unit reads lower than 90A
or greater than 110A, please contact your local GE
Field Sales Office.
CAUTION: With the Phase Current enabled, the
EntelliGuard trip unit will not provide correct
protection to the system, which may result in a trip
below desired levels. Power should be off from the
circuit breaker prior to entering Phase Current mode.
Ensure that the Phase Current LED is OFF when in
normal operation. Failure to follow this procedure
can result in improper operation of the system.