Allen-Bradley 20G1AND248AA0NNNNN

Common Fault Codes

Fault Code 12

HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip threshold.
Check for a short circuit or ground fault on the motor cables or motor windings. Verify motor load conditions and ensure the drive is sized correctly for the application.

Fault Code 13

Ground Fault – A current path to earth ground has been detected at the drive output.
Disconnect the motor and cables and perform insulation resistance testing. Inspect motor cable shielding and connections. Replace damaged cables or motor if insulation failure is confirmed.

Fault Code 3

Power Loss – Input power to the drive was lost or dropped below the acceptable threshold during operation.
Check incoming AC supply voltage for sags, phase loss, or interruptions. Verify fusing, disconnect switches, and supply transformer capacity. Inspect input power wiring connections.

Fault Code 33

Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts following a fault.
Identify and resolve the underlying fault that triggered the restart attempts. Review the fault queue log in the drive parameters. Adjust auto-restart parameters if the application permits.

Fault Code 63

SW OverCurrent – Software-detected output overcurrent condition exceeding the programmed trip level.
Check motor load for mechanical overload or jamming. Verify current limit parameter settings. Inspect motor and cabling for faults. Reduce acceleration rate if inrush current is causing nuisance trips.

Fault Code 29

Analog Input Loss – An analog input signal configured as a speed or process reference has been lost or fallen below the minimum threshold.
Check the analog signal source, wiring continuity, and signal levels at the drive terminals. Verify the loss-of-signal action parameter is configured appropriately for the application.

Fault Code 70

Power Unit – An internal power structure fault has been detected, which may indicate a problem with the IGBT module or gate driver circuitry.
Cycle power and monitor for recurrence. If the fault persists, inspect the power module for damage or overheating. Professional repair or replacement of the power section may be required.

Fault Code 122

Safe Torque Off – The safe torque-off (STO) input has been de-energized, disabling drive output.
Verify that the STO input wiring is intact and that the safety circuit or safety relay is energized correctly. Check for unintended activation of the safety function by the control system or E-stop circuit.