Allen-Bradley 20AD027A0AYNANC0

Common Fault Codes

Fault Code 2

Auxiliary Input fault. The auxiliary input interlock has opened, interrupting drive operation.
Check the auxiliary input wiring and the status of any external interlock devices connected to the drive. Restore the interlock circuit and clear the fault.

Fault Code 3

Power Loss fault. Input power to the drive was lost or dropped below acceptable levels during operation.
Verify incoming three-phase supply voltage at the drive input terminals. Check for loose connections, blown fuses, or upstream supply issues. Restore stable input power and reset the fault.

Fault Code 4

Undervoltage fault. DC bus voltage dropped below the minimum threshold required for operation.
Check input line voltage for sags or phase loss. Verify that the supply transformer and upstream protection devices are functioning correctly. Reset after restoring proper voltage.

Fault Code 5

Overvoltage fault. DC bus voltage exceeded the maximum allowable level, typically caused by regenerative energy from the motor.
Check for excessive deceleration rates and increase the decel time parameter. Verify that dynamic braking resistor (if installed) is correctly sized and connected. Reset the fault after correcting the condition.

Fault Code 7

Motor Overload fault. The drive's electronic overload protection has detected sustained overcurrent conditions indicating motor overloading.
Check motor load for mechanical binding or excessive load. Verify motor nameplate data matches drive parameter settings. Reduce load or adjust overload parameters as appropriate.

Fault Code 12

HW OverCurrent fault. Output current exceeded the hardware overcurrent trip threshold.
Check motor and output wiring for short circuits or ground faults. Verify motor insulation resistance. Inspect drive output transistors for damage. Clear the fault after resolving the root cause.

Fault Code 13

Ground Fault. A ground fault has been detected on the drive output or motor wiring.
Disconnect the motor and measure insulation resistance from each output phase to ground. Inspect motor windings and output cabling for insulation breakdown. Replace damaged components before restarting.

Fault Code 33

Auto Restart Tries fault. The drive attempted to automatically restart after a fault the maximum number of configured times without successfully resuming operation.
Investigate the underlying fault that triggered repeated restarts. Correct the root cause before manually resetting the drive. Review and adjust auto-restart parameters if necessary.