A780 Motor Stall Warning in ABB ACS880 Drive

A780 Motor Stall Warning in ABB ACS880 Drive indicates that the motor is operating in the stall region. This typically occurs when the motor is unable to accelerate or maintain speed due to excessive load, insufficient motor torque, or an incorrectly sized motor or drive.

The warning is generated by the programmable stall protection function:

31.24 – Stall Function

Motor stall protection helps prevent motor overheating and mechanical damage by detecting prolonged operation at high current and low speed.

Possible Causes:

  1. Excessive mechanical load on the motor.
  2. Motor power is too small for the application.
  3. Drive is undersized for the motor load.
  4. Mechanical jamming or blockage.
  5. Seized bearings.
  6. Gearbox or coupling problems.
  7. Conveyor or machine overload.
  8. Incorrect motor parameters.
  9. Incorrect stall protection settings.
  10. Excessive starting torque requirement.
  11. Low supply voltage causing reduced motor torque.
  12. Motor fault or damaged rotor.

Solutions:

  1. Check the motor load and ensure it is within design limits.
  2. Verify that the motor power rating is suitable for the application.
  3. Confirm that the drive is correctly sized for the motor and load.
  4. Inspect the driven equipment for mechanical blockage.
  5. Check bearings, gears, belts, chains, and couplings.
  6. Verify motor nameplate data in the drive parameters.

  7. Review the settings of:

    31.24 – Stall Function

  8. Check the stall protection thresholds and operating limits.
  9. Verify that the motor can provide the required torque.
  10. Check the supply voltage and power quality.
  11. Reduce the mechanical load if possible.
  12. Repair or replace faulty mechanical components.

Additional Information

The ACS880 stall protection function monitors:

  • Motor current.
  • Motor torque.
  • Motor speed.

A motor stall condition generally occurs when:

  • Current is high.
  • Speed is low or near zero.
  • The motor cannot overcome the load.

Common applications where stall warnings occur include:

  • Conveyors.
  • Crushers.
  • Mixers.
  • Pumps.
  • Hoists.
  • Fans with blocked impellers.

Recommended Troubleshooting Sequence

  1. Check for mechanical blockage.
  2. Verify motor current and torque values.
  3. Inspect bearings and transmission components.
  4. Compare motor power with application requirements.
  5. Verify drive sizing.
  6. Check motor parameter settings.
  7. Review Parameter 31.24 – Stall Function settings.
  8. Test the motor under reduced load conditions.

Relevant Parameter

ParameterDescription
31.24Stall Function

Related Faults and Warnings

CodeDescription
A780Motor Stall Warning
7121Motor Stall Fault

Common Symptoms

  • Motor fails to accelerate.
  • High motor current.
  • Low motor speed.
  • Reduced torque performance.
  • Repeated overload conditions.
  • Drive warning or fault during startup.

Proper drive sizing, correct motor selection, and elimination of mechanical overloads will help prevent recurring A780 Motor Stall Warnings in ABB ACS880 drives.

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