Allen-Bradley 20G14NC085AA0NNNNN

Common Fault Codes

Fault Code 12

HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip threshold.
Check for a short circuit or ground fault on the output wiring. Verify motor insulation resistance. Inspect for a seized or overloaded mechanical load. Reduce acceleration rate or increase current limit settings.

Fault Code 13

Ground Fault – A current path to earth ground has been detected on the drive output.
Disconnect the motor and output wiring and test insulation resistance to ground. Inspect cable shielding and motor windings for damage. Correct any wiring faults before restarting.

Fault Code 29

Analog Input Loss – An analog input signal has fallen below the configured loss threshold (typically below 2 mA on a 4-20 mA signal).
Check the analog signal source and wiring continuity. Verify the transmitter or controller providing the reference signal is powered and functioning. Inspect terminal connections for loose or corroded contacts.

Fault Code 33

Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts following a fault.
Identify and resolve the underlying fault that triggered repeated restarts. Review the fault queue log for the root cause fault code. Adjust auto-restart parameters if the application requires more attempts.

Fault Code 63

SW OverCurrent – The drive output current has exceeded the software-configured overcurrent trip level.
Check for mechanical overload on the driven equipment. Verify motor nameplate data matches drive parameter settings. Increase the overcurrent trip level if appropriate, or reduce the load.

Fault Code 70

Power Unit – A fault has been detected in the drive power section, which may include a failed IGBT or gate driver.
Cycle power and attempt to clear the fault. If the fault persists, inspect the power module for signs of damage or overheating. The power module or gate driver board may require replacement.

Fault Code 71

Motor Overload – The electronic motor overload protection has tripped due to sustained overcurrent condition.
Allow the motor to cool before resetting. Verify the motor FLA setting in the drive parameters matches the motor nameplate. Check for mechanical overload, blocked ventilation, or incorrect motor selection.

Fault Code 122

Safe Torque Off (STO) – The safe torque-off input circuit has been activated or an STO wiring fault has been detected.
Verify that the STO input terminals are correctly wired and that the safety circuit is providing the required 24V DC signal. Check for open circuits or damaged wiring in the STO loop. Do not bypass the safety function.