A2B1 Overcurrent Warning in ABB ACS880 Drive

A2B1 Overcurrent Warning in ABB ACS880 Drive indicates that the drive output current has exceeded the internal fault limit. This warning occurs when the motor draws excessive current due to overload, incorrect motor configuration, wiring issues, or faults in the motor circuit.

If the current continues to rise, the drive may trip to protect the power semiconductors and motor.

Possible Causes:

  1. Motor overload.
  2. Excessive mechanical load on the driven equipment.
  3. Incorrect speed scaling parameter setting.
  4. Incorrect frequency scaling parameter setting.
  5. Incorrect torque scaling parameter setting.
  6. Motor cable fault.
  7. Incorrect motor phasing.
  8. Incorrect star (Y) or delta (Δ) motor connection.
  9. Motor winding fault.
  10. Contactors opening or closing between the drive and motor.
  11. Incorrect motor nameplate data entered during startup.
  12. Power factor correction capacitors connected to the motor cable.
  13. Surge absorbers installed in the motor cable.
  14. Encoder wiring or phasing fault.
  15. Encoder feedback problems.

Solutions:

  1. Check the motor load and ensure it is within the motor and drive ratings.
  2. Inspect the driven machine for mechanical binding, jamming, or overload conditions.
  3. Verify the following scaling parameters:
    • 46.01 – Speed Scaling
    • 46.02 – Frequency Scaling
    • 46.03 – Torque Scaling
  4. Check the motor and motor cable for damage or loose connections.
  5. Verify correct motor phase sequence and wiring.
  6. Confirm that the motor is connected correctly in Star (Y) or Delta (Δ) according to the motor nameplate.
  7. Ensure there are no contactors switching between the drive and motor while the drive is running.
  8. Verify that the startup data in Parameter Group 99 matches the motor nameplate values.
  9. Check motor rated voltage, current, frequency, power, and speed settings.
  10. Remove any power factor correction capacitors installed between the drive and motor.
  11. Remove any surge absorbers connected to the motor cable.
  12. Inspect the encoder cable and verify correct wiring and phasing.
  13. Check encoder feedback signals for stability.
  14. Monitor the actual motor current to determine when the warning occurs.

Additional Information

The A2B1 Overcurrent Warning is usually caused by either:

  • Excessive motor load.
  • Incorrect motor setup.
  • Wiring faults.
  • Encoder feedback issues.
  • Motor circuit abnormalities.

Running the drive with incorrect motor data or improper motor wiring can significantly increase motor current and trigger this warning.

Recommended Troubleshooting Sequence

  1. Check the mechanical load.
  2. Verify motor cable and motor connections.
  3. Inspect Star/Delta motor wiring.
  4. Check parameters 46.01, 46.02, and 46.03.
  5. Verify motor data in Parameter Group 99.
  6. Ensure no contactors are switching between the drive and motor.
  7. Check encoder cable and phasing.
  8. Monitor output current during operation.

Relevant Parameters

ParameterDescription
46.01Speed Scaling
46.02Frequency Scaling
46.03Torque Scaling
Group 99Motor Startup and Nameplate Data

Proper motor sizing, correct startup data, and good motor wiring practices will help prevent recurring A2B1 Overcurrent Warnings in ABB ACS880 drives.

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