Allen-Bradley 20G11NC015AA0NNNNN

Common Fault Codes

Fault Code 12

HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip threshold, typically caused by a short circuit, motor winding fault, or excessive load.
Check motor and output wiring for short circuits or ground faults. Verify motor nameplate data matches drive parameter settings. Inspect load for mechanical jams or excessive inertia.

Fault Code 13

Ground Fault – A ground fault has been detected on the drive output, indicating current leakage to earth from the motor cable or motor windings.
Disconnect motor cables and test insulation resistance with a megohmmeter. Replace damaged cables or motor if insulation resistance is below acceptable limits. Check cable shielding and grounding connections.

Fault Code 25

Decel Inhibit – The drive cannot decelerate at the programmed rate because the DC bus voltage has exceeded the overvoltage threshold during braking.
Increase deceleration time in drive parameters. Install or verify operation of a dynamic braking resistor. Enable the bus voltage regulation feature if available.

Fault Code 29

Analog Input Loss – The analog input signal has fallen below the configured minimum threshold, indicating a broken wire or signal source failure.
Check wiring continuity on the analog input terminals. Verify the signal source (PLC analog output or sensor) is functioning correctly. Confirm parameter settings for analog input loss action and signal range.

Fault Code 33

Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts following a fault condition.
Identify and resolve the underlying fault that triggered repeated restarts. Review the fault queue log on the HIM. Adjust auto-restart parameters or disable auto-restart until the root cause is corrected.

Fault Code 63

SW OverCurrent – A software-level overcurrent condition has been detected, typically due to sustained overload beyond the drive's programmed current limit.
Verify motor load is within rated capacity. Check for mechanical binding in the driven equipment. Review motor overload parameters and ensure they match the motor nameplate data.

Fault Code 70

Power Unit – An internal power structure fault has been detected, which may indicate a damaged IGBT, gate driver fault, or internal hardware failure.
Cycle power and observe if the fault clears. If the fault persists, the power unit or gate driver board may require replacement. Contact a qualified repair technician for internal inspection and component-level testing.

Fault Code 100

Parameter Checksum – The drive has detected a checksum error in stored parameter data, indicating possible memory corruption or data loss.
Reload parameters from a saved configuration file using Connected Components Workbench or DriveExplorer software. If the fault recurs, the drive memory may be faulty and the unit may require repair or replacement.