Allen-Bradley 20G11FB070JA0NNNNN

Common Fault Codes

Fault 12

HW OverCurrent – Hardware overcurrent detection has been triggered, indicating instantaneous output current has exceeded the drive's hardware current limit.
Check for short circuits in motor wiring or motor windings. Verify motor and cable insulation resistance. Reduce acceleration rate or check for mechanical overload on the motor shaft.

Fault 13

Ground Fault – A current path to earth ground has been detected on the output of the drive.
Disconnect motor cables and test insulation resistance to ground using a megohmmeter. Inspect cable shielding and terminal connections. Replace damaged cables or motor if insulation failure is confirmed.

Fault 25

Decel Inhibit – The drive is unable to decelerate at the programmed rate because the DC bus voltage has risen above the overvoltage threshold.
Enable the bus voltage regulation feature or increase the deceleration time. Consider adding a dynamic braking resistor or regenerative unit if the load has high inertia.

Fault 29

Analog Input Loss – An analog input configured for 4-20 mA has dropped below 2 mA, indicating a broken wire or signal loss.
Check wiring continuity on the analog input terminals. Verify the signal source device is powered and functioning. Confirm the input is wired for current mode and not voltage mode.

Fault 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. Increase the auto-restart count parameter or address the root cause before re-enabling auto-restart.

Fault 63

SW OverCurrent – Software-level overcurrent protection has been triggered, indicating output current exceeded the programmed software current limit.
Verify motor nameplate current rating matches drive parameter settings. Check for mechanical overload or jamming. Inspect motor and cabling for partial short circuits.

Fault 70

Power Unit – An internal power structure fault has been detected, which may indicate an IGBT or gate driver failure.
Cycle power and observe if the fault recurs. Check input voltage for transients or imbalance. If fault persists, the power module or gate driver board may require inspection or replacement by a qualified technician.

Fault 100

Parameter Checksum – The drive has detected a checksum error in stored parameter data, indicating possible memory corruption.
Reload parameters from a saved backup using DriveExecutive or Studio 5000. If no backup exists, perform a factory reset and reprogram all parameters. Replace the control board if the fault recurs after reprogramming.