GE Industrial Solutions EntelliGuard G - Manual (Page 41)

DEH-41304C EntelliGuard® G Circuit Breaker
13 March 14 Section 8 – Maintenance, Testing and Troubleshooting
©2012 General Electric All Rights Reserved 41
TROUBLESHOOTING
Table 8.1 reviews common problems, their possible cause(s) and solution(s). If problems persist please contact our After
Sales Service Department at 1-888-GERESOLVE. (1-888-437-3765).
Table 8.1. Troubleshooting
Problem Possible Cause Solution
Breaker won’t close.  Breaker is between CONNECTED, TEST
and DISCONNECTED positions.
 Trip unit has not been reset.
 Under voltage release coil is installed
but not energized.
 Interlocks installed.
 Racking handle inserted.
 Rack circuit breaker to CONNECTED, TEST or
DISCONNECTED remove racking handle and close
circuit breaker.
 Push orange button on trip unit and close circuit
breaker.
 Energize under voltage release coil and close
circuit breaker.
 Remove interlocks.
 Remove handle and close circuit breaker.
 Check operational diagram and trip the relevant
circuit breaker.
Breaker closes then opens
instantaneously.  Breaker information module connector
is not inserted.
 Trip unit settings are incorrect.
 Remote Rogowski coil is incorrectly
installed.
 Insert breaker information module connector to
breaker information module.
 Ensure the protection limits setting matches
system loads. Ensure inputs are set to normally
closed trip without a signal applied.
 Re-position coil.
Motor won’t charge. Ensure motor actuator is installed. Install motor actuator.
DC closing coil or under voltage
release won’t operate. Ensure the correct polarity of the
connection to the secondary isolating
contacts.
Refer to wiring schematic (see Section 3).
Circuit breaker won’t rack into
cassette.  Ensure breaker is pushed fully from the
maintenance position to
DISCONNECTED.
 Racking drive not in DISCONNECTED
position.
 Push breaker into DISCONNECTED position.
 Ensure racking drive is in DISCONNECTED
position.
Ground fault does not operate
below 40% setting. Ensure trip unit is installed and energized. Install trip unit and energize. See Section 3 for wiring
schematic.
Cannot insert racking handle.  Shutter padlocks are installed.
 Key locks are installed.
Remove padlocks and/or key locks.
Circuit breaker will not go into
the DISCONNECTED position.  Rejection feature is incorrectly set.
 Circuit breaker is incorrect for given
cassette.
 Reset rejection feature.
 Ensure circuit breaker and cassette go together.
Trip unit status not working.  Ensure trip unit, if installed, is
energized.
 Insufficient primary current to power
the unit.
 Install trip unit, if not installed.
 Trip unit will power with 40% I
n
single phase, and
20% I
n
3 phase current.
Trip unit not displaying existing
fault after tripping the circuit
breaker. Trip unit set to auto reset (fault still stored).  Check trip history for fault type.
 Set trip unit reset button to manual.
MODBUS communications not
responding  Communication incorrectly configured.
 Trip unit baud rate not compatible with
host.
 Request configuration document.
 Set trip unit baud rate to match host.