Troubleshooting Manual for Control Panel

  1. SDF

Possible Fault: Fuse Burning.
Cause: Over Current, Short Circuit
Remedy:-Replace the Fuse with same rated new one

Possible Fault: Tripping
Cause: Short Circuited current.
Remedy: Rectify the cause produced the tripping current and rectified the same. Put ON the MCCB/MCB

  1. Power Contactor.

Possible Fault: Motor not starting.
Cause: Contactor Coil faulty, Coil is not getting Power
Remedy: Check the Power Supply voltage from Coil point. If coil is faulty replace with new one.
4. OLR


                    TO Motor

Series to starter Coil (NC)
Possible Faults: Motor not starting/Motor tripping continuously
Cause: Relay Tripped, Current adjustment is faulty.
Remedy: Release the tripped OLR switch, Adjust the current rating according to the Name Plate.

  1. Relays:

Possible Fault: Not Working.
Cause: Coil faulty, No power, Contact got damaged
Remedy: Check the power Supply voltage, Continuity between contacts, wiring faulty.
6. Controlling power supply.
Possible Fault: No Out put voltage, Voltage variation,
Cause: Fuse Blown, loose Connection
Remedy: Replace Fuse, Connect properly.
7. Transformer.
Possible Fault: No Voltage, Low Voltage, Different Voltage, over heating.
Cause: No Input Voltage, Loose connection, Over Load, Shot Circuit,
Remedy: Check the input and out put Voltage, Limit Load Current
8. Terminal Block.
Possible fault: Sparking and No Continuity.
Cause: Loose Connection.
Remedy: Tight the Connections and shot link.
9. Solenoid Valves.
Possible Fault: Not working
Cause: No Inlet Air supply, No Electrical Power supply, Air leakage,
Remedy: Check the Air and power supply


Please may you explain to me what is ?

  1. SDF. 2) OLR. 3) RYB. 4) OLR switch
    best greetings.


SDF- Switch Disconnector Fuse
OLR- Over Load Relay
RYB- Red Yellow Blue ( 3 -Phase color indication)

Best Wishes


Can some one explain which program is mostly used in DCS for linking inputs