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BREAKER ME10
2.9 TROUBLESHOOTING
Table 3.1 reviews common problems, their possible cause(s) and solution(s). If problems persist please contact our After Sales Service Department.
Table:
Troubleshooting Guide Breaker
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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 -->
Breaker closes then opens instantaneously. -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Breaker Information Module connector is not inserted.
-- Trip Unit settings are incorrect.
-- Remote Rogowski coil is incorrectly installed.
-- SOLUTION -->
Motor won't charge. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Ensure Motor Actuator is installed.
-- SOLUTION -->
DC closing coil or Undervoltage Release won't operate. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Ensure the correct polarity of the connection to the secondary isolating contacts.
-- SOLUTION -->
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 -->
Ground fault does not operate below 40% setting. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Ensure Trip Unit is installed and energized.
-- SOLUTION -->
Cannot insert racking handle. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Shutter padlocks are installed.
-- Key locks are installed.
-- SOLUTION -->
Circuit breaker will not go into the DISCONNECTED position. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Mis insertion feature is incorrectly set.
-- Circuit breaker is incorrect for given cassette.
-- SOLUTION -->
Trip Unit healthy indicator not working. (Fig 2.1) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-- Ensure Trip Unit, if installed, is energized.
-- Insufficient primary current to power the unit.
-- SOLUTION -->
Troubleshooting Guide Trip Unit
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The trip unit display is blank.
External +24 VDC is absent.
-- SOLUTION -->
The load current fluctuates near 20% of the breaker sensor rating.
-- SOLUTION -->
---
-- SOLUTION -->
The trip unit display E02. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
BIM error.
-- SOLUTION -->
The trip unit display E03. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Memory failure.
-- SOLUTION -->
The trip unit display E06. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Internal failure.
-- SOLUTION -->
The trip unit display E08. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Invalid rating plug.
-- SOLUTION -->
Unit does not communicate with the Master. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The communication wires are shorted or improperly connected.
-- SOLUTION -->
Incorrect baud rate.
-- SOLUTION -->
Incorrect address.
-- SOLUTION -->
Current readings are incorrect. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Incorrect rating plug value.
-- SOLUTION -->
Voltage readings are incorrect. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The potential transformer (PT) primary voltage was defined incorrectly.
-- SOLUTION -->
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 -->
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 -->
2-48
INTRO
BREAKER
TRIP UNIT
Possible Cause
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.
-- 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.
-- Install Motor Actuator.
-- Refer to wiring schematic (see Section 1.3).
-- Push breaker into DISCONNECTED position.
-- Ensure racking drive is in DISCONNECTED position.
-- Install Trip Unit and energize. See Section 3 for wiring schematic.
-- Remove padlocks and/or key locks.
-- Reset Mis insertion feature.
-- Ensure circuit breaker and cassette go together.
-- Install Trip Unit, if not installed.
-- Trip Unit will power with 40% In single phase, and 20% In 3 phase current.
Possible Cause
Solution
At least 20% of the current sensor rating, (xCT) must be flowing through the breaker to activate the display.
If not, power the trip unit with the internal battery.
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.
No communication with the BIM Check the BIM harness.
Mismatch trip unit / BIM option
Return the unit to AEG.
Return the unit to AEG.
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.
Locate and repair the short or the incorrect connection.
Check that the baud rate assigned to the trip unit, agrees with the baud rate at the host.
Check that the address assigned to the trip unit, agrees with the address at the host.
Check the rating plug label.
Read the PT primary rating from the PT name plate and set trip unit PT to this value.
Replace the battery.
Power the trip unit with external power or by energizing the breaker for several days to freshen the battery.
LOCKS
ACCESSORIES
TESTS
APPENDIX
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