Allen-Bradley 20F11NC104AA0NNNNN

Common Fault Codes

Fault 12

HW OverCurrent – Hardware overcurrent detection has been triggered, indicating output current has exceeded the drive's hardware current limit.
Check for a short circuit or ground fault on the motor output wiring. Verify motor insulation resistance. Reduce acceleration rate or check for mechanical overload on the driven equipment.

Fault 13

Ground Fault – A current path to earth ground has been detected on the drive output.
Disconnect motor cables and test insulation resistance to ground. Inspect output wiring for damaged insulation. Replace motor or wiring if insulation failure is confirmed.

Fault 29

Analog Input Loss – An analog input signal has been lost or fallen below the configured minimum threshold (typically used when 4-20 mA signal is expected).
Verify the analog signal source is active and wired correctly. Check parameter settings for analog input loss action. Inspect wiring continuity between the signal source and the drive terminals.

Fault 33

Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts following a fault condition.
Identify and resolve the underlying fault that triggered repeated restarts. Review fault queue history. Adjust auto-restart parameters or clear the fault manually after correcting the root cause.

Fault 38

Phase U to Ground Short – A short circuit has been detected between output phase U and ground.
Disconnect motor and output wiring. Perform insulation resistance testing on each output phase. Replace damaged cables or motor windings as required.

Fault 63

SW OverCurrent – Software-level overcurrent detection has been triggered, indicating the output current exceeded the programmed software current limit.
Check for mechanical overload on the motor shaft. Verify motor nameplate data matches drive parameter settings. Reduce load or increase the acceleration/deceleration time.

Fault 70

Power Unit – An internal power structure fault has been detected, which may indicate a problem with the inverter section or gate driver circuitry.
Cycle power to the drive and monitor for recurrence. If the fault persists, inspect the drive's internal power components. The drive may require professional repair or replacement of the power module.

Fault 100

Parameter Checksum – A checksum error has been detected in the drive's non-volatile parameter storage, indicating possible data corruption.
Reload parameters from a saved configuration file or reprogram all parameters manually. If the fault recurs after reprogramming, the drive's memory hardware may be faulty and require service.