Allen-Bradley 20AD3P4C3AYNNNNN

Common Fault Codes

Fault Code 2

Auxiliary Input fault. The auxiliary input interlock has been opened, indicating an external fault condition has been triggered.
Check the wiring and status of the auxiliary input terminals. Verify that any external safety interlocks or control signals connected to the auxiliary input are in the correct state before resetting the fault.

Fault Code 3

Power Loss fault. The drive detected a loss of input AC power or a significant voltage sag on the input supply.
Check the incoming AC supply voltage for all three phases. Verify fuses, contactors, and supply wiring. Restore stable input power before restarting the drive.

Fault Code 4

Undervoltage fault. The DC bus voltage has dropped below the minimum acceptable threshold during operation.
Measure the incoming AC supply voltage and verify it is within specification. Check for loose connections or supply interruptions. Inspect the DC bus capacitors if the fault persists.

Fault Code 5

Overvoltage fault. The DC bus voltage has exceeded the maximum allowable level, typically caused by regenerative energy from the motor during deceleration.
Increase the deceleration time parameter to reduce regenerative energy. Verify the supply voltage is within specification. If the problem persists, consider adding a dynamic braking resistor.

Fault Code 6

Motor Stall fault. The drive has detected that the motor is stalled or unable to accelerate to the commanded speed within the allowed time.
Check for mechanical obstructions on the driven load. Verify motor parameters (nameplate data) are correctly programmed. Increase the stall fault time parameter if the load requires a longer acceleration period.

Fault Code 7

Motor Overload fault. The drive's electronic overload protection has tripped due to sustained overcurrent conditions that could damage the motor.
Check the motor load for excessive mechanical resistance. Verify motor FLA (Full Load Amps) is correctly entered in the drive parameters. Allow the motor to cool before resetting and investigate the root cause of overloading.

Fault Code 12

HW OverCurrent fault. A hardware-level overcurrent condition has been detected in the output stage of the drive, indicating current has exceeded the hardware trip threshold.
Check the motor and output wiring for short circuits or ground faults. Verify the motor is not mechanically jammed. Inspect the output power devices; if the fault recurs immediately on restart, the drive output stage may require repair or replacement.

Fault Code 33

Auto Restart Tries fault. The drive has exhausted the maximum number of automatic restart attempts following a fault condition.
Identify and resolve the underlying fault that triggered the automatic restart sequence. Manually reset the drive after correcting the root cause. Review and adjust the auto-restart parameters if appropriate for the application.