Allen-Bradley 20G11RC3P5JA0NNNNN

Common Fault Codes

Fault 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 continuity and confirm the external device is operating correctly before clearing the fault.

Fault 3

Power Loss fault. DC bus voltage dropped below the minimum threshold during operation, indicating an input power interruption.
Check incoming AC supply voltage for sags, phase loss, or interruptions. Verify input fuses and contactor operation. Investigate upstream power quality issues.

Fault 4

Undervoltage fault. DC bus voltage is below the minimum operating level at power-up or during run.
Measure incoming line voltage at the drive input terminals. Confirm voltage is within the rated range (380–480 V AC). Check for loose connections or undersized supply wiring.

Fault 5

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

Fault 7

Motor Overload fault. The drive's electronic overload protection has detected sustained overcurrent indicating the motor is thermally overloaded.
Check motor load for mechanical binding or excessive load. Verify motor nameplate data is correctly programmed in the drive. Allow motor to cool before restarting and investigate root cause of overload.

Fault 12

HW Overcurrent fault. Output current has exceeded the hardware overcurrent trip threshold, indicating a short circuit, ground fault, or severe overload.
Disconnect the motor and check output wiring for short circuits or ground faults. Verify motor insulation resistance with a megohmmeter. Check for mechanical jam in the driven equipment.

Fault 29

Analog Input Loss fault. An analog input signal configured for 4–20 mA has dropped below 2 mA, indicating a broken wire or failed signal source.
Check the analog signal source and wiring to the drive's analog input terminals. Verify the transmitter or controller providing the reference signal is powered and functioning correctly.

Fault 71

Adapter Communication Loss fault. The drive has lost communication with an installed option card or network adapter.
Check that the option card is fully seated in its slot. Inspect the network cable and connections. Verify the network master or scanner is active and the drive node address is correctly configured.