Allen-Bradley 20G1ABC540JN0NNNNN

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. Verify motor insulation resistance. Inspect for mechanical overload on the driven equipment. Check drive output transistors for damage.

Fault Code 13

Ground Fault – A ground fault has been detected on the drive output or motor wiring.
Disconnect the motor and test cable insulation to ground with a megohmmeter. Inspect motor windings for insulation breakdown. Repair or replace damaged cables or motor as required.

Fault Code 25

Decel Inhibit – The drive is unable to decelerate at the programmed rate due to excessive DC bus voltage.
Increase the deceleration time parameter. Verify that a dynamic braking resistor or regenerative unit is installed and functioning correctly. Check DC bus voltage level during deceleration.

Fault Code 29

Analog Input Loss – An analog input signal has fallen below the configured loss threshold (typically used with 4-20 mA signals).
Check the analog signal source and wiring continuity. Verify the signal level at the drive terminals. Confirm the analog input loss action parameter is configured appropriately for the application.

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. Adjust the auto restart parameters if the application requires more attempts, or address the root cause fault.

Fault Code 63

SW OverCurrent – Software-detected overcurrent condition; output current exceeded the programmed software overcurrent limit.
Check for mechanical overload on the motor. Verify motor and drive current ratings are compatible. Review current limit parameter settings. Inspect motor and cabling for faults.

Fault Code 71

Power Loss – An input power loss or undervoltage condition has been detected on the DC bus.
Check incoming AC supply voltage for sags, dropouts, or phase loss. Verify all input fuses and contactors are intact. Inspect input power wiring connections for looseness or corrosion.

Fault Code 122

Safe Torque Off (STO) Fault – The safe torque-off function has been activated or a discrepancy has been detected in the STO circuit.
Verify that the STO input signals are correctly wired and that the safety circuit is energized as intended. Check for wiring faults on the STO terminals. If STO activation was unintended, inspect the safety relay or PLC safety output.