GE
41 Woodford Avenue, Plainville, CT 06062
www.geelectrical.
com
© 2008 General Electric Company
DEH-4568 Rev. 01 (12/08)
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.
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 Trip Unit.
Powering the trip unit: The test kit can be used to power
the trip unit as follows:
• Connect the EntelliGuar
d 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.
Trip Breaker Test: Pressing the Trip Breaker button signals
the trip unit to trip the br
eaker 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.
If trip unit fails to trip the breaker in this test, remove the
breaker from service and refer the trip unit to an authorized
GE service representative.
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 but-
ton signals the trip unit to temporarily disable the GF protection.
Test Mode: 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).
When in test mode, the Phase Simulation 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.
CAUTION: With the Test Mode 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 discon-
nected from the circuit breaker prior to entering Test Mode.
Ensure that the Test Mode LED is OFF when in normal operation.
Failure to follow this procedure can result in improper operation
of the system.
WARNING: When using EntelliGuard Digital Test Kit to defeat
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.
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