A3A2 DC Link Undervoltage Warning in ABB ACS880 Drive

A3A2 DC Link Undervoltage Warning in ABB ACS880 Drive indicates that the intermediate circuit (DC Link) voltage is below the minimum required level while the drive is stopped. This warning is usually caused by low or missing input power, blown fuses, loose supply connections, or supply voltage disturbances.

The drive monitors the DC bus voltage continuously and generates this warning when the voltage falls below the allowable threshold.

Possible Causes:

  1. Low mains supply voltage.
  2. Missing input phase.
  3. Blown input fuse.
  4. Loose or damaged supply cable connections.
  5. Supply voltage interruption.
  6. Faulty circuit breaker or contactor.
  7. Input power imbalance.
  8. Defective rectifier section.
  9. Voltage dip caused by other large loads on the power system.
  10. Incorrect supply voltage configuration.
  11. Internal power circuit fault.

Solutions:

  1. Check the incoming mains voltage.
  2. Verify that all three input phases are present.
  3. Inspect input fuses and replace any blown fuses.
  4. Check supply cable terminals for loose or damaged connections.
  5. Verify proper operation of contactors, breakers, and switchgear.
  6. Measure phase-to-phase voltages and check for imbalance.
  7. Inspect the rectifier section if the warning persists.
  8. Check for voltage dips caused by large motors or equipment connected to the same supply.

  9. Verify the setting of:

    Parameter 95.01 – Supply Voltage

  10. Ensure the configured supply voltage matches the actual incoming voltage.
  11. Restore normal supply voltage conditions and monitor the DC bus voltage.

Additional Information

The DC Link is the internal DC bus that supplies power to the inverter section of the drive. If the DC bus voltage becomes too low, the drive may not be able to produce the required output voltage and current.

Common causes of A3A2 DC Link Undervoltage Warning include:

  • Low mains voltage.
  • Missing supply phase.
  • Blown fuses.
  • Loose power connections.
  • Supply interruptions.
  • Rectifier faults.

If the undervoltage condition becomes severe during operation, it may eventually result in a DC Link Undervoltage Fault.

Recommended Troubleshooting Sequence

  1. Measure the incoming supply voltage.
  2. Verify all three phases are present.
  3. Check input fuses and circuit breakers.
  4. Inspect power cable connections.
  5. Verify Parameter 95.01 – Supply Voltage.
  6. Check for supply voltage dips or interruptions.
  7. Inspect the rectifier section if necessary.
  8. Restore normal power conditions and verify the warning clears.

Relevant Parameter

ParameterDescription
95.01Supply Voltage

Proper power supply quality, correct voltage configuration, and regular inspection of input power components will help prevent recurring A3A2 DC Link Undervoltage Warnings in ABB ACS880 drives.

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