Allen-Bradley 20-750-P6-C770D740

Common Fault Codes

Fault Code 12

HW OverCurrent – Hardware overcurrent detected in the power structure. The output current has exceeded the hardware trip threshold.
Check motor and output wiring for short circuits or ground faults. Verify motor load is within drive rating. Inspect power module for damage and replace if necessary.

Fault Code 13

Ground Fault – A ground fault has been detected on the output of the drive.
Disconnect the motor and test insulation resistance of motor windings and output cables. Locate and repair the ground fault before restarting.

Fault Code 63

SW OverCurrent – Software-level overcurrent detected. Output current exceeded the programmed overcurrent limit.
Check for excessive load, mechanical jam, or incorrect motor parameters. Verify current limit settings in drive parameters and adjust if necessary.

Fault Code 4

UnderVoltage – DC bus voltage has dropped below the minimum threshold during operation.
Check incoming AC supply voltage for sags or interruptions. Verify input fuses and connections. Check for excessive load causing bus collapse.

Fault Code 5

OverVoltage – DC bus voltage has exceeded the maximum allowable level, typically caused by regenerative energy from the motor.
Check deceleration ramp settings and extend deceleration time. Verify bus voltage levels. Consider adding a dynamic braking resistor or active front end if regeneration is frequent.

Fault Code 29

Analog Input Loss – Signal on an analog input has been lost or fallen below the configured minimum threshold.
Check wiring and signal source on the analog input terminals. Verify signal levels and parameter configuration for analog input loss action.

Fault Code 71

Power Module Fault – An internal fault has been detected within the power module or power structure.
Cycle power and observe if fault recurs. Inspect the power module for signs of damage, overheating, or failed components. Replace the power module if fault persists.

Fault Code 122

OverTemp – Drive or power module temperature has exceeded the allowable operating limit.
Check ambient temperature and cooling airflow. Clean heatsink and cooling fans. Verify that the drive is not overloaded. Allow drive to cool before restarting.