GE EntelliGuard GT-L Installation, Operation And Maintenance Manual Download

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5-04

Maintenance

ouble

LOCKS

EntelliGuard L

INTRO

BREAKER

ACCESSORIES

TESTS

APPENDIX

TRIP UNIT

5.9 TROUBLESHOOTING

Table 5.1 reviews common problems, their possible cause(s) and solution(s). If problems persist please contact our After Sales Service Department.

Table:
Troubleshooting Guide Breaker

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.

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-- Trip Unit settings are incorrect.

-- Remote Rogowski coil is incorrectly installed.

-- SOLUTION -->

-- 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.

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-- 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.

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-- 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.

Cannot insert racking handle.

-- Shutter padlocks are installed.

-- Key locks are installed.

-- SOLUTION -->

-- Remove locks.

Circuit breaker will not go into the DISCONNECTED position.

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-- 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)

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-- 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

The trip unit display is blank.

Ex24 VDC is absent.

-- SOLUTION -->

At least 20% of the current sensor rating, (xCT) must be flowing through the breaker to activate the display.

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.

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notes notas | notatki