Crane Control Panel Faults: Contactors, VFDs, Overloads and Power Supply

Classify crane control-panel faults around contactors, overloads, VFDs, transformers, protection, phase/power supply, radio receiver, limits and motor circuits.

First data for a panel fault

The affected motion, whether the fault is continuous or intermittent, panel indication/error code, motor response and recent intervention narrow the diagnostic path.

• Affected motion
• Error code
• Motor response
• Service history

Contactor and overload symptoms

Failure to pull in or release, burnt contacts, coil supply, overload trips or loose connections are reviewed with the relevant circuit and load condition.

• Contactor
• Coil
• Overload
• Connection

VFD and power-supply side

Drive alarms, phase loss, under/over-voltage, braking resistor, parameters or motor connection are assessed through fault codes and electrical measurements.

• VFD alarm
• Phase
• Voltage
• Motor connection

What to send to service

Provide an overall panel photo, component labels, error code, safe-distance connection photos and the command/motion that triggers the problem.

• Panel photo
• Labels
• Error code
• Command/motion