Allen-Bradley 20AB042A0AYNANC0

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 3

Power loss fault. The drive detected a loss of input AC power for longer than the configured power loss time.
Check incoming AC supply voltage and connections. Verify that all three input phases are present and within specification. Reset the drive after restoring power.

Fault Code 4

Undervoltage fault. DC bus voltage dropped below the minimum threshold during operation.
Check input supply voltage for sags or brownouts. Inspect input fuses and connections. Verify that the supply transformer is adequately sized for the load.

Fault Code 5

Overvoltage fault. DC bus voltage exceeded the maximum allowable level, typically caused by regenerative energy from a decelerating load.
Increase deceleration time to reduce regenerative energy. Check if a dynamic braking resistor is required and properly connected. Verify input supply voltage is within specification.

Fault Code 7

Motor overload fault. The drive's electronic overload protection has detected that the motor has been operating above its rated current for an extended period.
Check motor current draw and compare to nameplate rating. Verify motor overload parameters are correctly configured. Inspect the mechanical load for excessive friction or jamming.

Fault Code 12

Hardware overcurrent fault. Output current exceeded the drive's hardware overcurrent trip level, indicating a severe overcurrent condition.
Check for a short circuit in the motor wiring or motor windings. Inspect output cables for insulation damage. Verify that the motor is not mechanically seized.

Fault Code 33

Auto-restart attempts exceeded. The drive attempted to automatically restart after a fault the maximum configured number of times without successfully clearing the fault.
Identify and resolve the underlying fault that triggered the auto-restart attempts. Review the fault queue for the original fault code. Reset the drive manually after correcting the root cause.

Fault Code 81

Communication loss fault. The drive lost communication with the controlling network adapter or PLC within the configured timeout period.
Check network cabling and connector integrity. Verify PLC or controller is actively communicating on the network. Review communication timeout parameter settings and ensure the network adapter module is properly seated.