Allen-Bradley 20F11GC085JA0NNNNN

Common Fault Codes

Fault Code 2

Auxiliary Input fault. The auxiliary input interlock has opened, indicating an external fault condition has been signaled to the drive.
Check the external device or circuit connected to the auxiliary input terminals. Verify wiring integrity and confirm the external interlock condition has been cleared before resetting the drive.

Fault Code 3

Power Loss fault. The drive detected a loss of input AC power or an input phase loss condition.
Check incoming AC supply voltage on all three phases. Inspect input fuses, disconnect, and supply wiring. Verify that input voltage is within the specified range of 342-528V AC.

Fault Code 4

Undervoltage fault. DC bus voltage has dropped below the minimum threshold, typically caused by low input voltage or a momentary power dip.
Measure input line voltage and verify it is within specification. Check for loose connections on the input terminals. If voltage dips are frequent, consider installing a line reactor or UPS.

Fault Code 5

Overvoltage fault. DC bus voltage has exceeded the maximum allowable level, often caused by regenerative energy from a decelerating load.
Increase the deceleration time parameter to reduce regenerative energy. If the application requires fast deceleration, install a dynamic braking resistor or regenerative braking option.

Fault Code 7

Motor Overload fault. The drive's electronic overload protection has detected sustained overcurrent conditions indicating the motor is being overloaded.
Verify motor load conditions and reduce mechanical load if excessive. Check motor overload parameter settings and confirm they match the motor nameplate data. Inspect the driven machinery for mechanical binding.

Fault Code 12

HW OverCurrent fault. The drive output current has exceeded the hardware overcurrent trip threshold, indicating a severe overcurrent event.
Check for a short circuit on the output wiring or motor windings. Measure motor insulation resistance. Verify that acceleration time is not too short for the connected load inertia.

Fault Code 29

Analog Input Loss fault. The analog input signal has been lost or has fallen below the minimum configured threshold, typically indicating a broken 4-20 mA signal wire.
Check the analog input wiring and signal source. Verify the signal is within the configured range. Inspect the transmitter or controller providing the analog reference signal.

Fault Code 71

Adapter Communication Loss fault. Communication between the drive and an installed option card or peripheral adapter has been interrupted or lost.
Check that the option card is fully seated in its slot. Inspect the network cable connections and verify network integrity. Check the network scanner or controller for communication errors and review adapter configuration parameters.