LOCKS
EntelliGuard G
INTRO BREAKER ACCESSORIES TESTS APPENDIX
TRIP UNIT
GENERAL
PRODUCTOPERATIONSCREEN MODECURVESREGISTERINSTALLATIONCONNECTIONTROUBLE
2-56
2.8 TROUBLESHOOTING
Table reviews common problems, their possible cause(s) and solution(s). If problems persist please contact our After Sales Service Department.
Table:
Troubleshooting Guide Breaker Possible Cause Solution
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Breaker won’t close.
-- Breaker is between CONNECTED, TEST and DISCONNECTED positions.
-- Trip Unit has not been reset.
-- Undervoltage Release is installed but not energized.
-- Interlocks installed.
-- Racking handle inserted.
-- SOLUTION --> -- 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 Undervoltage Release and close circuit breaker.
-- Remove interlocks.
-- Remove handle and close circuit breaker.
-- Check operational diagram (chapter 1.4) 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.
-- SOLUTION --> -- 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.
-- SOLUTION --> -- Install Motor Actuator.
DC closing coil or Undervoltage Release won’t operate. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Ensure the correct polarity of the connection to the secondary isolating contacts.
-- SOLUTION --> -- Refer to wiring schematic (see Section 1.3).
Circuit breaker won’t rack into cassette. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Ensure breaker is pushed fully from the maintenance position to DISCONNECTED.
-- Racking drive not in DISCONNECTED position.
-- SOLUTION --> -- 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.
-- SOLUTION --> -- Install Trip Unit and energize. See Section 3 for wiring schematic.
Cannot insert racking handle. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Shutter padlocks are installed.
-- Key locks are installed.
-- SOLUTION --> -- Remove padlocks and/or key locks.
Circuit breaker will not go into the DISCONNECTED position. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Mis insertion feature is incorrectly set.
-- Circuit breaker is incorrect for given cassette.
-- SOLUTION --> -- Reset Mis insertion feature.
-- Ensure circuit breaker and cassette go together.
Trip Unit healthy indicator not working. (Fig 2.1) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Ensure Trip Unit, if installed, is energized.
-- Insufficient primary current to power the unit.
-- SOLUTION --> -- Install Trip Unit, if not installed.
-- Trip Unit will power with 40% In single phase, and 20% In 3 phase current.
Troubleshooting Guide Trip Unit Possible Cause Solution
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The trip unit display is blank.
External +24 VDC is absent.
-- SOLUTION --> At least 20% of the current sensor rating, (xCT) must be flowing through the breaker to activate the display.
The load current fluctuates near 20% of the breaker sensor rating.
-- SOLUTION --> If not, power the trip unit with the internal battery.
--- -- SOLUTION --> The battery power supply is disabled when any current is sensed through the current sensors.
Check that the control power supply is present and operational.
The trip unit display E02. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
BIM error.
-- SOLUTION --> No communication with the BIM Check the BIM harness.
Mismatch trip unit / BIM option
The trip unit display E03. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Memory failure.
-- SOLUTION --> Return the unit to GE.
The trip unit display E06. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Internal failure.
-- SOLUTION --> Return the unit to GE.
The trip unit display E08. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Invalid rating plug.
-- SOLUTION --> Check the rating plug. The rating plug value shall not exceed and be below 40% of the breaker sensor.
Ensure the rating plug is properly sited.
Unit does not communicate with the Master. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The communication wires are shorted or improperly connected.
-- SOLUTION --> Locate and repair the short or the incorrect connection.
Incorrect baud rate.
-- SOLUTION --> Check that the baud rate assigned to the trip unit, agrees with the baud rate at the host.
Incorrect address.
-- SOLUTION --> Check that the address assigned to the trip unit, agrees with the address at the host.
Current readings are incorrect. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Incorrect rating plug value.
-- SOLUTION --> Check the rating plug label.
Voltage readings are incorrect. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The potential transformer (PT) primary voltage was defined incorrectly.
-- SOLUTION --> Read the PT primary rating from the PT name plate and set trip unit PT to this value.
The PT connection was defined incorrectly.
-- SOLUTION -->Set the trip unit phase to phase PH-PH or phase to neutral PH-N according to the system.
The display is blank or the Low Battery symbol appears when the BATTERY key is pressed. -----------------------------------------------------------------------------------------------------------------------------------
The battery is discharged.
-- SOLUTION --> Replace the battery.
Line current is below 20% of the breaker sensor rating. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The battery was stored too long with no power applied to the trip unit.
-- SOLUTION --> Power the trip unit with external power or by energizing the breaker for several days to freshen the battery.
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