A581 Fan Fault Warning in ABB ACS580 Drive

A581 Fan Fault in the ABB ACS580 Drive is a warning indicating that the drive has not received the expected feedback signal from one of its cooling fans. The ACS580 continuously monitors the operation of its internal cooling fans to ensure adequate cooling of the power electronics. If the feedback signal from a fan is missing or invalid, the drive generates Warning A581.

A581 Fan Fault Warning in ABB ACS580 Drive


This warning generally indicates a problem with the cooling fan, fan feedback circuit, or fan connection, rather than an immediate failure of the power electronics.

Possible Causes

  • Cooling fan failure.
  • Missing fan feedback signal.
  • Cooling fan connector is loose.
  • Fan power supply interruption.
  • Faulty fan feedback circuit.
  • Defective cooling fan motor.
  • Damaged fan wiring.
  • Internal control board fan monitoring fault.
  • Fan blocked by dust or debris.
  • Mechanical obstruction preventing fan rotation.
  • Aging cooling fan bearings.
  • Internal hardware fault.
  • Incorrect fan installation after maintenance.
  • Faulty replacement fan.

Solutions

  • Check the auxiliary code to identify the affected fan.
  • Verify the cooling fan is operating correctly.
  • Inspect the fan connector for loose or damaged connections.
  • Check the fan wiring.
  • Remove dust or debris preventing fan rotation.
  • Verify the fan rotates freely.
  • Inspect the fan power supply.
  • Check the fan feedback circuit.
  • Replace the faulty cooling fan if necessary.
  • Verify normal fan feedback after replacement.
  • Restart the drive and confirm the warning clears.
  • Contact ABB technical support if the warning persists.

Additional Information

The ABB ACS580 continuously monitors the operation of its internal cooling fans using fan feedback signals.

When the expected feedback signal is missing, the drive generates Warning A581 Fan Fault to warn that cooling performance may be reduced.

ABB recommends checking the auxiliary code to identify which fan is affected.

Auxiliary Code Interpretation

  • Code 0 → Main Fan 1
  • Format XYZ
    • X = Operating state
      • 1 = ID Run
      • 2 = Normal operation
    • Y = Reserved (0)
    • Z = Fan Index
      • 1 = Main Fan 1
      • 2 = Main Fan 2
      • 3 = Main Fan 3

After identifying the affected fan:

  • Check fan operation.
  • Inspect the fan connection.
  • Replace the cooling fan if it is defective.

If cooling becomes insufficient, continued operation may eventually result in an overtemperature warning or fault.

Common Symptoms

  • Drive displays A581 Fan Fault warning.
  • Cooling fan is not rotating.
  • Cooling fan runs intermittently.
  • Reduced airflow through the drive.
  • Fan noise changes or stops completely.
  • Warning appears during normal operation.
  • Drive continues operating with a warning.
  • Overtemperature warnings may occur later.
  • Auxiliary code identifies the affected fan.
  • Warning clears after replacing the faulty fan.

Recommended Troubleshooting Sequence

  1. Read the auxiliary code.
  2. Identify the affected cooling fan.
  3. Verify the fan is rotating.
  4. Inspect the fan connector.
  5. Check the fan wiring.
  6. Remove dust or debris.
  7. Verify free fan rotation.
  8. Check the fan feedback signal.
  9. Replace the faulty cooling fan.
  10. Restart the drive.
  11. Verify normal fan operation.
  12. Confirm the warning has cleared.
  13. Monitor drive temperature.
  14. Verify adequate airflow.
  15. Contact ABB technical support if the warning persists.

Fan Fault Check Table

Check PointAction
Auxiliary codeIdentify the affected fan
Fan operationVerify proper rotation
Fan connectorInspect secure connection
Fan wiringCheck for loose or damaged wiring
Fan feedbackVerify feedback signal
Fan conditionCheck for wear or mechanical damage
Fan obstructionRemove dust or debris
Fan power supplyVerify correct operation
Cooling airflowConfirm adequate ventilation
Fan replacementReplace if defective
ABB technical supportContact if the warning remains after inspection

Preventive Maintenance Tips

  • Clean cooling fans regularly to remove dust buildup.
  • Inspect fan connectors during scheduled maintenance.
  • Verify fan operation periodically using drive diagnostics.
  • Replace cooling fans at ABB's recommended maintenance intervals.
  • Keep cabinet ventilation openings unobstructed.
  • Maintain proper ambient temperature around the drive.
  • Prevent contamination from oil, moisture, and conductive dust.
  • Use only ABB-approved replacement fans.
  • Monitor recurring fan warnings to identify aging components.
  • Record fan replacement dates for preventive maintenance planning.

Proper inspection of the cooling fan, fan feedback circuit, fan wiring, and fan connectors, along with regular cleaning and timely replacement of worn cooling fans, will help prevent recurring A581 Fan Fault warnings in ABB ACS580 drives, ensuring effective cooling, reliable thermal protection, and dependable long-term operation of the drive system.

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