Allen-Bradley 20F11NC060AA0NNNNN

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 integrity 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, indicating an input power interruption or severe voltage sag.
Check incoming AC supply voltage for sags, phase loss, or interruptions. Verify input fusing and contactor operation. Inspect input wiring connections.

Fault 4

Undervoltage fault. DC bus voltage is below the minimum operating level during run, typically caused by low input line voltage.
Measure input line voltage and verify it is within the drive's specified range. Check for loose input 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 or high input line voltage.
Increase deceleration time to reduce regenerative energy. Verify input line voltage is within specification. Consider adding a dynamic braking resistor if regenerative loads are frequent.

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.
Check for mechanical overload on the driven equipment. Verify motor nameplate data is correctly programmed into the drive. Inspect motor windings for degradation.

Fault 12

HW Overcurrent fault. Output current has exceeded the drive's hardware overcurrent trip threshold, indicating a short circuit, ground fault, or severe overload condition.
Check motor and output wiring for short circuits or ground faults. Verify load is not mechanically jammed. Inspect output terminals and motor insulation resistance.

Fault 29

Analog Input Loss fault. An analog input configured for 4-20 mA signal has detected a signal 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 signal is powered and functioning correctly.

Fault 70

Safe Torque-Off (STO) fault. The STO hardware circuit has been activated or an inconsistency has been detected in the STO input signals.
Verify that the STO input wiring is correctly connected and that the safety circuit is properly enabled. Check for wiring faults or discrepancies between the two STO input channels.