Allen-Bradley 20G1AND248JN0NNNNN

Common Fault Codes

Fault Code 12

HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip threshold.
Check motor and output wiring for short circuits or ground faults. Verify motor nameplate data matches drive configuration. Inspect output transistors for damage.

Fault Code 13

Ground Fault – A current path to earth ground has been detected at the drive output.
Disconnect motor and test insulation resistance of motor windings and output cables. Replace damaged cables or motor if insulation has failed.

Fault Code 25

Decel Inhibit – The drive is unable to decelerate at the programmed rate due to excessive DC bus voltage.
Increase deceleration time, enable the bus voltage regulation feature, or install a dynamic braking resistor to dissipate regenerative energy.

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 transmitter or controller providing the signal is operational. Review the analog input loss action parameter setting.

Fault Code 33

Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts after a fault.
Identify and resolve the underlying fault that triggered repeated restarts. Review the fault queue log, correct the root cause, and manually clear the fault before resuming operation.

Fault Code 63

SW OverCurrent – Software-detected output overcurrent condition exceeding the programmed current limit.
Check for mechanical overload on the driven equipment. Verify motor parameters are correctly programmed. Reduce load or increase the acceleration time to limit inrush current.

Fault Code 71

Power Loss – Input power was lost or dropped below the minimum acceptable level during operation.
Check incoming supply voltage at all three phases. Inspect input fuses, contactors, and supply wiring. Verify the power loss fault action parameter is configured appropriately for the application.

Fault Code 122

I/O Module Failure – A fault has been detected in an installed option module in one of the drive option card slots.
Power down the drive and reseat the option module. If the fault persists, replace the option module. Verify the module is compatible with the installed firmware version.