A6A4 Motor Nominal Value Warning in ABB ACS880 Drive

A6A4 Motor Nominal Value Warning in ABB ACS880 Drive indicates that one or more motor nameplate parameters have been entered incorrectly or are inconsistent with each other. The drive validates the motor configuration data during commissioning and generates this warning when it detects invalid or unrealistic motor values.

A6A4 Motor Nominal Value Warning in ABB ACS880 Drive


Incorrect motor data can affect motor control performance, speed estimation, torque calculation, and protection functions.

Possible Causes:

  1. Incorrect motor nameplate data entered into the drive.
  2. Motor nominal voltage set incorrectly.
  3. Motor nominal current set incorrectly.
  4. Motor nominal power entered incorrectly.
  5. Incorrect motor nominal speed.
  6. Slip frequency calculated too low.
  7. Motor torque, power, and speed values do not match.
  8. Motor parameters entered in the wrong units.
  9. Incorrect motor pole count.
  10. Drive not properly sized for the motor.
  11. Commissioning errors.
  12. Wrong motor selected during startup.

Solutions:

  1. Check the motor nameplate and verify all motor data entries.
  2. Review the motor configuration parameters in:
    • Group 98 – Motor Control Settings
    • Group 99 – Motor Data / Start-up Data
  3. Confirm that:
    • Nominal Voltage matches the motor nameplate.
    • Nominal Current matches the motor nameplate.
    • Nominal Power matches the motor nameplate.
    • Nominal Speed matches the motor nameplate.
    • Nominal Frequency is correct.
  4. Verify that the drive is correctly sized for the motor.
  5. Correct any inconsistent motor data.
  6. Perform motor identification again if required.
  7. Check the auxiliary code to determine the specific parameter issue.

Auxiliary Code Interpretation

The auxiliary code identifies the specific motor data inconsistency detected by the drive.

Auxiliary CodeDescriptionRecommended Action
1Slip frequency is too smallCheck motor configuration parameters in Groups 98 and 99. Verify motor speed and frequency data.
2Synchronous speed and nominal speed differ too muchVerify motor nominal speed and motor pole count.
3Nominal speed is higher than synchronous speed with 1 pole pairCheck motor speed and frequency settings. Correct the motor pole configuration.
4Nominal current is outside allowable limitsVerify motor nominal current value from the nameplate.
5Nominal voltage is outside allowable limitsVerify motor nominal voltage setting.
6Nominal power is higher than apparent powerCheck motor power, voltage, and current values.
7Nominal power is not consistent with nominal speed and torqueVerify motor power, speed, and torque values.

Additional Information

The ACS880 uses motor nameplate data to calculate:

  • Slip compensation.
  • Torque production.
  • Speed estimation.
  • Motor thermal protection.
  • Motor identification routines.
  • Vector control performance.

Incorrect motor data can result in:

  • Poor speed regulation.
  • Reduced torque accuracy.
  • Startup problems.
  • Unstable motor operation.
  • Incorrect protection functions.

Recommended Troubleshooting Sequence

  1. Read and record the auxiliary code.
  2. Compare all motor settings with the motor nameplate.
  3. Verify motor configuration parameters in Groups 98 and 99.
  4. Check that motor voltage, current, power, frequency, and speed are correct.
  5. Confirm the drive is properly sized for the motor.
  6. Correct any invalid values.
  7. Perform motor identification if required.
  8. Restart the drive and verify that the warning is cleared.

Relevant Parameter Groups

Parameter GroupDescription
98Motor Control Settings
99Motor Configuration / Start-Up Data

Common Motor Data to Verify

  • Motor Nominal Voltage (V)
  • Motor Nominal Current (A)
  • Motor Nominal Frequency (Hz)
  • Motor Nominal Speed (RPM)
  • Motor Nominal Power (kW / HP)
  • Motor Nominal Torque (Nm)

Accurate motor nameplate data and correct drive sizing are essential for reliable operation and will help prevent recurring A6A4 Motor Nominal Value Warnings in ABB ACS880 drives.

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