Allen-Bradley 20F11ND027AA0NNNNN

Common Fault Codes

Fault Code 2

Auxiliary Input fault. The auxiliary input interlock has opened, indicating an external fault condition has been triggered via the auxiliary input terminal.
Check the wiring and status of the device connected to the auxiliary input terminal. Clear the external fault condition and reset the drive.

Fault Code 12

HW OverCurrent fault. The drive output current has exceeded the hardware overcurrent trip threshold, typically caused by a short circuit or severe motor overload.
Check motor and output wiring for short circuits or ground faults. Verify motor load is within drive rating. Inspect motor for mechanical overload conditions.

Fault Code 13

Ground Fault. A ground fault has been detected on the drive output, indicating current leakage to earth from the motor or output wiring.
Disconnect the motor and check output wiring insulation resistance to ground. Inspect motor windings for insulation breakdown. Replace damaged cables or motor as required.

Fault Code 25

Drive OverTemp fault. The drive heatsink temperature has exceeded the maximum allowable limit, indicating inadequate cooling or excessive ambient temperature.
Check that cooling fans are operational and airflow is unobstructed. Verify ambient temperature is within specification. Clean heatsink fins if blocked. Check for excessive load causing high output current.

Fault Code 33

Auto Restart Tries fault. The drive has attempted to automatically restart the maximum number of times following a fault without successfully running, and has locked out.
Identify and resolve the underlying fault that caused repeated restarts. Manually reset the drive after correcting the root cause. Review fault queue for the initiating fault code.

Fault Code 38

Phase Loss fault. Loss of one or more input AC supply phases has been detected, which can cause unbalanced operation and potential drive damage.
Check incoming three-phase supply voltage at all three input terminals. Inspect input fuses, contactors, and supply wiring for open circuits. Restore balanced three-phase supply before restarting.

Fault Code 71

Safe Torque-Off (STO) fault. The safe torque-off function has been activated, removing gate drive signals from the output power devices.
Verify that the STO input signals are correctly wired and that the safety circuit is in the correct state for operation. Check safety relay or controller outputs feeding the STO terminals. Reset the drive after confirming safe conditions.

Fault Code 81

EtherNet/IP Communication Loss fault. The drive has lost communication with the EtherNet/IP network controller or scanner within the configured timeout period.
Check EtherNet/IP cable connections and network switch status. Verify the controller is in Run mode and the drive is correctly configured in the I/O tree. Check drive IP address settings and network topology for faults.