2340 Short Circuit Fault in ABB ACS580 Drive

2340 Short Circuit in the ABB ACS580 Drive indicates that the drive has detected a short circuit in the motor circuit or an abnormal condition in the output stage. The ACS580 continuously monitors the output phases to protect the inverter power module and motor. If a short circuit is detected in the motor, motor cable, or drive output, the drive generates Fault 2340 and immediately trips to prevent damage.

If the Auxiliary Code is 0x0080, it indicates that the state feedback from the output phases does not match the control signals, suggesting an abnormal condition in the inverter output stage or its feedback circuit.

This fault generally indicates a problem with the motor, motor cable, output wiring, or inverter output stage, rather than the input power supply.

Possible Causes

• Short circuit in the motor.
• Short circuit in the motor cable.
• Incorrect motor cable wiring.
• Phase-to-phase short circuit.
• Phase-to-ground fault.
• Damaged motor insulation.
• Damaged motor cable insulation.
• Loose or incorrect motor terminal connections.
• Power factor correction capacitors installed in the motor cable.
• Surge absorbers installed in the motor cable.
• Internal inverter output stage fault.
• Output phase feedback mismatch (Aux Code 0x0080).
• Internal IGBT or output circuit failure.

Solutions

• Check the motor and motor cable for wiring errors.
• Inspect the motor cable for phase-to-phase or phase-to-ground short circuits.
• Measure the motor insulation resistance.
• Verify correct motor terminal connections.
• Ensure that no power factor correction capacitors are connected to the motor cable.
• Ensure that no surge absorbers are connected between the drive and the motor.
• Inspect the motor cable for physical damage.
• Cycle power to the drive after correcting the fault.
• If Aux Code 0x0080 is present, inspect the inverter output stage and output feedback circuit.
• Repair or replace the drive if an internal output stage fault is confirmed.

Additional Information

The ABB ACS580 continuously monitors the condition of its inverter output phases.

Fault 2340 is generated when the drive detects an abnormal short-circuit condition or an inconsistency between the commanded and actual output phase states.

According to ABB:

• The primary causes are short circuits in the motor or motor cable.
• Auxiliary Code 0x0080 indicates that the state feedback from the output phases does not match the control signals, which may point to an internal inverter hardware problem if external wiring is correct.

Unlike an Overcurrent Fault, 2340 Short Circuit is specifically intended to detect severe output faults that require immediate shutdown to protect the drive's power semiconductors.

Common Symptoms

• Drive displays 2340 Short Circuit.
• Motor stops immediately.
• Fault occurs at startup or when the RUN command is issued.
• Drive trips instantly after enabling output.
• Motor fails to rotate.
• Repeated trips after reset.
• High output current may be observed.
• Fault remains after cable reconnection if hardware is damaged.
• Aux Code 0x0080 may accompany the fault.
• Drive output remains disabled until the fault is cleared.

Recommended Troubleshooting Sequence

1. Verify that the fault is 2340 Short Circuit.
2. Disconnect power and follow lockout/tagout procedures.
3. Inspect the motor cable for wiring errors.
4. Check for phase-to-phase and phase-to-ground short circuits.
5. Measure the motor insulation resistance.
6. Verify correct motor terminal connections.
7. Ensure there are no power factor correction capacitors installed between the drive and motor.
8. Ensure there are no surge absorbers connected to the motor cable.
9. Inspect the motor cable for physical damage.
10. Review the auxiliary code.
11. If Aux Code 0x0080 is displayed, inspect the inverter output stage and output phase feedback circuit.
12. Cycle power to the drive after correcting any external faults.
13. Restart the drive and monitor operation.
14. If the fault persists with a verified-good motor and cable, suspect an internal drive hardware fault.
15. Contact ABB technical support if the fault cannot be cleared.

2340 Short Circuit Check Table

Check Point	Action
Motor	Check for winding short circuits
Motor cable	Inspect for damage and wiring errors
Motor insulation	Measure insulation resistance
Motor terminals	Verify correct connections
Power factor correction capacitors	Remove if installed between drive and motor
Surge absorbers	Remove if installed in the motor cable
Auxiliary code	Check for 0x0080
Output phase feedback	Inspect if 0x0080 is present
Drive power cycle	Restart after correcting the fault
ABB technical support	Contact if the fault persists

Preventive Maintenance Tips

• Periodically inspect motor cables for insulation damage.
• Tighten motor and drive output terminals during scheduled maintenance.
• Perform routine motor insulation resistance testing.
• Never install power factor correction capacitors between the drive and the motor.
• Do not connect surge absorbers to the drive output unless specifically approved by ABB.
• Protect motor cables from mechanical damage and moisture.
• Verify motor wiring after maintenance or replacement.
• Keep the drive clean and properly cooled.
• Record recurring 2340 Short Circuit faults for trend analysis.
• Investigate repeated Aux Code 0x0080 events promptly, as they may indicate deterioration of the inverter output stage.

Proper inspection of the motor, motor cable, output wiring, insulation, and output phase feedback, together with verification that no power factor correction capacitors or surge absorbers are installed between the drive and the motor, will help prevent recurring 2340 Short Circuit faults in ABB ACS580 drives, ensuring reliable motor operation, effective protection of the inverter power module, and dependable long-term performance of the drive system.