Allen-Bradley 20AC3P5C3AYNANC0

Common Fault Codes

Fault Code 2

Auxiliary Input fault – the auxiliary input interlock has been opened.
Check the auxiliary input wiring and ensure all interlock contacts are closed before restarting the drive.

Fault Code 3

Power Loss fault – DC bus voltage dropped below the minimum threshold during operation.
Check incoming AC supply voltage for sags or interruptions. Verify power connections and upstream fusing.

Fault Code 4

Undervoltage fault – DC bus voltage is below the minimum allowable level at power-up or during run.
Verify that the incoming supply voltage is within the rated range (480V AC nominal). Check for loose connections or supply issues.

Fault Code 5

Overvoltage fault – DC bus voltage has exceeded the maximum allowable level, typically caused by regenerative energy from the motor.
Check for excessive deceleration rates. Increase deceleration time or install a dynamic braking resistor if required.

Fault Code 7

Motor Overload fault – the electronic motor overload protection has tripped due to sustained overcurrent condition.
Verify motor nameplate data matches drive parameter settings. Check for mechanical overload on the driven equipment. Allow motor to cool before restarting.

Fault Code 12

HW Overcurrent fault – output current has exceeded the hardware overcurrent trip level.
Check for short circuits in motor wiring or motor windings. Verify motor insulation resistance. Inspect drive output terminals for wiring faults.

Fault Code 13

Ground Fault – excessive current is flowing to ground on the drive output.
Disconnect motor and test insulation resistance of motor windings and cables to ground. Replace damaged cables or motor if insulation failure is confirmed.

Fault Code 33

Auto Restart Tries fault – the drive has exceeded the maximum number of automatic restart attempts.
Identify and resolve the underlying fault causing repeated trips. Clear the fault manually and investigate root cause before re-enabling auto restart.