Allen-Bradley 20F11RC015JA0NNNNN

Common Fault Codes

Fault 2

Auxiliary Input Fault – The hardware enable or auxiliary input has opened, indicating an external interlock or safety circuit has de-energized.
Check the wiring to the hardware enable input (typically terminal 11/12). Verify that all external safety interlocks and E-stop circuits are closed and functioning correctly before re-enabling the drive.

Fault 3

Power Loss Fault – Input power to the drive was lost or dropped below the acceptable threshold during operation.
Check incoming AC line voltage at the drive input terminals. Verify supply transformer capacity, fusing, and line connections. Investigate upstream power quality issues such as voltage sags or phase loss.

Fault 4

UnderVoltage Fault – DC bus voltage has fallen below the minimum operating threshold, typically caused by low input voltage or a momentary power interruption.
Measure input line voltage and confirm it is within the 342-528V AC range. Check for loose input connections, undersized supply wiring, or excessive voltage drop under load.

Fault 5

OverVoltage Fault – DC bus voltage has exceeded the maximum allowable level, commonly caused by regenerative energy from a decelerating load.
Increase the deceleration ramp time in the drive parameters. If the application requires fast deceleration, install a dynamic braking resistor and enable the brake chopper function. Check for overhauling load conditions.

Fault 7

Motor Overload Fault – The drive's electronic overload protection has tripped due to sustained overcurrent to the motor, indicating the motor is operating beyond its rated thermal capacity.
Verify motor nameplate FLA and confirm the motor overload current parameter is set correctly. Check for mechanical overload on the driven equipment, blocked ventilation on the motor, or incorrect motor sizing for the application.

Fault 12

HW OverCurrent Fault – A hardware-level overcurrent condition was detected in the drive output stage, indicating a current level that exceeded the hardware trip threshold.
Check motor and output wiring for short circuits or ground faults. Verify motor insulation resistance with a megohmmeter. Inspect the driven load for mechanical jams. If wiring and motor check out, the drive power module may require inspection or replacement.

Fault 33

Auto Restart Tries Fault – The drive attempted to automatically restart after a fault the maximum configured number of times without successfully running, and has locked out.
Identify and resolve the underlying fault that caused repeated trips before clearing this lockout. Review the fault queue log in the drive to determine the root cause fault code. Clear the fault manually once the root cause is corrected.

Fault 81

Communication Loss Fault – The drive lost communication with the network adapter option card or the controlling PLC/scanner within the configured timeout period.
Check the network cable connections at the option card and the network switch or controller. Verify the network adapter option card is fully seated in its slot. Confirm the PLC program is actively scanning the drive and that the communication timeout parameter is set appropriately for the application.