Troubleshooting LV-Panel

1. Indications (Phase & Status) not coming on switchboard

Probable Causes Solutions
Power Supply not connected to switchboard Connect Power Supply to the Incomer Breaker
Control MCBs for Indication Ckt. are off or Control Fuses are blown off Switch “ON” the MCBs or replace Control Fuse Links whichever is applicable
Indicating Lamps are faulty Replace Indicating Lamps
No Control Supply Available Check for rated Control Supply to the switchboard at the terminals provided as per wiring drawing.

2. Circuit Breakers can not be closed

Probable Causes Solutions
Opening command not executed byTripping Coil Check the voltage and the supply circuit, if problem persists replace the Tripping Coil
Welded contacts of the Circuit Brekers Contact STANDARD CONTROL PANEL PVT. LTD. Mobile: +91-98764-00718, +91-99884-20003
No Control Supply Available Check for rated Control Supply to the switchboard at the terminals provided as per wiring drawing.
Breaker Control Switch Faulty Replace faulty Breaker Control Switch.

3. Circuit Breaker Cranking Rod cannot be put into the Racking Slot

Probable Causes Solutions
Circuit Breaker in Closed/On condition Open the Circuit Breaker

4. Circuit Breaker cannnot be Racked In/Out

Probable Causes Solutions
Presence of any Rack In/Out Interocking Follow correct Interlocking sequence

5. Nuisance Tripping of Circuit Breakers

Probable Causes Solutions
U/V Release supply too low Check the voltage and the supply circuit, if problem persists replace the U/V Release
Wrong operation sequence done manually Follow the correct operation sequence and restore supply
Follow the correct operation sequence and restore supply Remove the fault after detection and than close the Circuit Breaker after inspection of circuit breaker condition