2340 Short Circuit Fault in ABB ACS880 Drive

2340 Short Circuit Fault in ABB ACS880 Drive indicates that the drive has detected a short circuit in the motor, motor cable, or drive output circuit. This fault occurs when the output current rises rapidly to a level that indicates a phase-to-phase or phase-to-ground short circuit.

2340 Short Circuit Fault in ABB ACS880 Drive


The drive immediately trips to protect the:

  • IGBT power modules
  • Motor windings
  • Motor cables
  • Drive output circuitry

Possible Causes

  1. Short circuit in motor winding.
  2. Short circuit between motor cable phases.
  3. Motor cable insulation failure.
  4. Phase-to-earth fault in motor or cable.
  5. Incorrect motor cable connections.
  6. Damaged motor terminal box.
  7. Loose cable strands causing phase contact.
  8. Incorrect motor wiring after maintenance.
  9. Power factor correction capacitors connected between drive and motor.
  10. Surge absorbers installed in the motor cable circuit.
  11. Incorrect motor parameter configuration.
  12. Damaged drive output IGBTs.

Solutions

  1. Check the motor and motor cable for wiring errors.
  2. Inspect motor terminals for loose or damaged connections.
  3. Verify there is no phase-to-phase short circuit.
  4. Measure motor winding resistance.
  5. Perform insulation resistance testing on:
    • Motor
    • Motor cable

  6. Check that:

    99.10 – Motor Nominal Power

    is set correctly according to the motor nameplate.

  7. Remove any power factor correction capacitors connected between the drive and motor.
  8. Remove any surge absorbers connected to the motor cable.
  9. Inspect cable glands, junction boxes, and terminal blocks.
  10. Check motor cable for physical damage.
  11. Verify correct star/delta motor connection.
  12. If all external components are healthy, inspect the drive output section for damaged IGBTs.

Relevant Parameter

ParameterDescription
99.10Motor Nominal Power

Additional Information

The ACS880 continuously monitors output current and detects abnormal current spikes that indicate a short circuit condition.

Typical short circuit locations include:

  • Motor windings
  • Motor terminal box
  • Motor cable
  • Junction box
  • Output contactor wiring
  • Drive output stage

When detected, the drive immediately shuts down to prevent damage.

Common Symptoms

  • Fault occurs immediately when starting.
  • Drive trips instantly after issuing a run command.
  • Blown fuses or circuit breakers.
  • Motor does not rotate.
  • Very low insulation resistance readings.
  • Burnt smell from motor or cable.

Recommended Troubleshooting Sequence

  1. Disconnect the motor from the drive.
  2. Check motor winding resistance.
  3. Perform insulation resistance testing.
  4. Inspect motor cable for damage.
  5. Verify motor terminal connections.
  6. Check 99.10 Motor Nominal Power setting.
  7. Remove any capacitors or surge suppressors from the motor circuit.
  8. Run the drive without the motor connected (if permitted by application procedures).
  9. If the fault remains, inspect the drive output IGBTs.

Insulation Resistance Guidelines

Measure between:

  • U to Earth
  • V to Earth
  • W to Earth

Also measure:

  • U-V
  • V-W
  • U-W

Abnormally low resistance values may indicate a short circuit or insulation failure.

Related Faults and Warnings

CodeDescription
2340Short Circuit Fault
2330Earth Leakage Fault
2310Overcurrent Fault
3381Output Phase Loss Fault
A2B4Short Circuit Warning

Preventive Maintenance Tips

  • Periodically inspect motor cables.
  • Perform insulation resistance testing during maintenance.
  • Verify motor wiring after any repair work.
  • Do not install power factor correction capacitors between the drive and motor.
  • Keep motor terminal boxes clean and dry.
  • Monitor motor current trends for abnormal changes.

Proper motor wiring, healthy insulation, correct 99.10 Motor Nominal Power settings, and regular inspection of motor cables will help prevent recurring 2340 Short Circuit Faults in ABB ACS880 drives.

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