Allen-Bradley 25B-E022N104

Common Fault Codes

Fault Code F002

Auxiliary Input fault. The auxiliary input interlock has opened, indicating an external fault condition has been detected via the digital input configured as auxiliary.
Check the external device or circuit connected to the auxiliary input. Verify wiring integrity and confirm the external interlock condition has been cleared before resetting the drive.

Fault Code F004

Power Loss fault. DC bus voltage dropped below the minimum threshold during operation, indicating an input power interruption or severe voltage sag.
Check incoming AC supply voltage for sags, phase loss, or interruptions. Verify input fusing and connections. If power quality is poor, consider adding line reactors or an uninterruptible power supply.

Fault Code F005

Overvoltage fault. The DC bus voltage exceeded the maximum allowable level, typically caused by regenerative energy from a decelerating load.
Increase the deceleration time parameter to reduce regenerative energy. If the application requires fast deceleration, install a dynamic braking resistor and enable the brake transistor function.

Fault Code F006

Undervoltage fault. The DC bus voltage fell below the minimum operating threshold during run, indicating low input voltage or a momentary power interruption.
Measure the incoming AC supply voltage and verify it is within the rated range of 342-528V AC. Check for loose input connections, blown fuses, or upstream supply issues.

Fault Code F007

Motor Overload fault. The drive's electronic thermal overload protection has tripped, indicating the motor has been operating above its rated current for an extended period.
Check the motor load for mechanical binding or excessive load. Verify motor nameplate FLA is correctly entered in the drive parameters. Allow the motor to cool before resetting.

Fault Code F012

Hardware Overcurrent fault. Output current exceeded the drive's instantaneous overcurrent trip threshold, indicating a short circuit, ground fault, or sudden load spike.
Check motor and output wiring for short circuits or ground faults. Verify the motor is not mechanically seized. Inspect output terminals and cable insulation. Do not restart until the fault cause is identified.

Fault Code F033

Auto-Tune fault. The automatic motor tuning procedure failed to complete successfully, which may result in suboptimal motor control performance.
Ensure the motor is disconnected from the load during auto-tune if possible. Verify motor nameplate data is correctly entered. Check that the motor is not in a fault condition and retry the auto-tune procedure.

Fault Code F111

Safe Torque-Off (STO) fault. The STO input signal has been removed or an STO circuit fault has been detected, disabling drive output as a safety response.
Verify the STO wiring at the dedicated STO terminals. Confirm the safety circuit or safety relay is functioning correctly and providing the required 24V DC signal. Check for wiring faults or open circuits in the STO loop.