Allen-Bradley 20G11RD3P4JA0NNNNN

Common Fault Codes

Fault Code 2

Auxiliary Input Fault: A digital input configured as an auxiliary input has opened, indicating an external fault condition.
Check the external device or circuit connected to the auxiliary input. Verify wiring integrity and the state of the external contact before clearing the fault and restarting.

Fault Code 3

Power Loss Fault: Input power to the drive was lost or dropped below the acceptable threshold during operation.
Verify incoming AC supply voltage at all three phases. Check fuses, contactors, and supply cabling. Restore stable power before restarting the drive.

Fault Code 4

Undervoltage Fault: DC bus voltage has fallen below the minimum operating threshold.
Check input line voltage for sags or phase loss. Inspect the precharge circuit and DC bus capacitors. Verify supply transformer capacity is adequate for the load.

Fault Code 5

Overvoltage Fault: DC bus voltage has exceeded the maximum allowable level, typically caused by regenerative energy from a decelerating load.
Increase the deceleration ramp time. Verify the dynamic braking resistor (if installed) is correctly sized and connected. Check for overhauling load conditions.

Fault Code 7

Motor Overload Fault: The drive's electronic overload protection has detected sustained overcurrent, indicating the motor is operating beyond its rated capacity.
Check for mechanical overload on the driven equipment. Verify motor nameplate data is correctly programmed in the drive parameters. Inspect motor windings for degradation.

Fault Code 12

HW Overcurrent Fault: Output current has exceeded the hardware overcurrent trip level, indicating a severe overcurrent event.
Check for a short circuit in the motor cables or motor windings. Verify the motor is not stalled. Inspect output IGBTs for damage if the fault recurs immediately on restart.

Fault Code 33

Auto Restart Tries Fault: The drive has exhausted the configured number of automatic restart attempts following a fault without successfully resuming operation.
Identify and resolve the underlying fault that triggered the restart attempts. Review the fault queue log in the drive. Manually clear the fault after correcting the root cause.

Fault Code 81

Communication Loss Fault: The drive has lost communication with the controlling device (e.g., PLC or scanner) over the configured network within the specified timeout period.
Check EtherNet/IP or other network cabling and connections. Verify the controller is actively scanning the drive. Review the communication timeout parameter settings and network health.