Allen-Bradley 20BD052A0AYNANA0

Common Fault Codes

Fault Code 2

Auxiliary input fault. The auxiliary input interlock has opened, indicating an external fault condition has been signaled to the drive.
Check the wiring and status of the auxiliary input terminals. Verify that any external safety or interlock devices connected to this input are functioning correctly and reset the fault once the condition is cleared.

Fault Code 3

Power loss fault. The drive detected a loss of input AC power for longer than the configured power loss time.
Check input power supply voltage and connections. Verify that all three input phases are present and within specification. Inspect fuses and contactors upstream of the drive.

Fault Code 4

Undervoltage fault. The DC bus voltage has dropped below the minimum threshold, typically caused by low input voltage or a momentary power dip.
Measure the incoming AC line voltage and verify it is within the rated range (400-480V AC). Check for loose connections or voltage sags on the supply. Adjust the undervoltage trip level parameter if appropriate.

Fault Code 5

Overvoltage fault. The DC bus voltage has exceeded the maximum allowable level, often caused by regenerative energy from a decelerating load.
Verify that deceleration ramp times are not too short for the load inertia. Check that the dynamic braking resistor (if installed) is correctly sized and connected. Increase deceleration time or add a braking resistor.

Fault Code 7

Motor overload fault. The drive's electronic overload protection has detected that the motor has been operating above its rated current for an extended period.
Check the motor load for mechanical binding or excessive load. Verify that the motor nameplate FLA is correctly entered in the drive parameters. Inspect the motor for overheating or winding issues.

Fault Code 12

HW overcurrent fault. The output current has exceeded the hardware overcurrent trip level, indicating a severe overcurrent condition.
Check for a short circuit in the motor wiring or motor windings. Verify that the motor is not mechanically jammed. Inspect output power cables and motor terminals for insulation damage.

Fault Code 25

Drive overtemperature fault. The drive heatsink temperature has exceeded the maximum allowable limit.
Check that ambient temperature is within specification. Verify that cooling fans are operating and that ventilation clearances around the drive are maintained. Clean any dust or debris from heatsink fins and fan filters.

Fault Code 33

Auto-tune fault. The auto-tune procedure failed to complete successfully, which may result in degraded motor control performance.
Verify that the motor is disconnected from the load during auto-tune if required. Check that motor nameplate data entered in the parameters is accurate. Retry the auto-tune procedure and review the drive user manual for auto-tune prerequisites.