3381 Output Phase Loss Fault in ABB ACS580 Drive

3381 Output Phase Loss Fault in the ABB ACS580 Drive indicates that the drive has detected a missing motor phase connection. One of the three motor output phases (U, V, or W) is open or disconnected, preventing the motor from operating correctly. In scalar control mode, the drive detects this fault only when the output frequency is above 10% of the motor's nominal frequency.

3381 Output Phase Loss Fault in ABB ACS580 Drive


This fault generally indicates a problem with the motor cable, motor connections, or motor circuit, rather than an internal drive hardware failure.

Possible Causes

  • One motor phase is disconnected.
  • Loose motor terminal connection.
  • Broken motor cable.
  • Open circuit in one of the motor windings.
  • Damaged motor connector.
  • Incorrect motor wiring.
  • Motor cable damaged during operation.
  • Poor terminal contact.
  • Motor nominal current is very small compared to the drive output current (scalar control mode).
  • Incorrect Motor Phase Loss protection setting.

Solutions

  1. Connect the motor cable and ensure all three output phases (U, V, and W) are properly connected.
  2. If the drive is operating in scalar control mode and the motor nominal current is less than 1/6 of the drive's nominal output current, set Parameter 31.19 – Motor phase loss to No action.
  3. Inspect the motor cable for damage or broken conductors.
  4. Tighten all motor terminal connections.
  5. Check the motor windings for continuity and repair or replace the motor if necessary.
  6. Reset the fault and verify normal motor operation.

Additional Information

The ABB ACS580 continuously monitors the motor output phases to detect missing phase conditions that could cause poor motor performance or overheating.

Fault 3381 is generated when the drive detects that one of the three motor phases is missing.

In scalar control mode, phase-loss monitoring becomes active only when the output frequency exceeds 10% of the motor's nominal frequency.

According to ABB, the recommended corrective actions are to:

  • Connect the motor cable properly.
  • If using scalar control with a small motor (motor nominal current less than 1/6 of the drive nominal output current), set Parameter 31.19 – Motor phase loss to No action.

Unlike an Input Phase Loss fault, 3381 relates to the motor output circuit, not the incoming AC supply.

Common Symptoms

  • Drive displays 3381 Output Phase Loss Fault.
  • Motor fails to start or runs roughly.
  • Motor vibrates excessively.
  • Reduced motor torque.
  • Motor draws unbalanced current.
  • Fault occurs after motor cable damage.
  • Drive trips shortly after starting.
  • Motor may hum instead of rotating.
  • Fault appears only above 10% of nominal frequency in scalar mode.
  • Production stops unexpectedly.

Recommended Troubleshooting Sequence

  1. Verify that the fault is 3381 Output Phase Loss Fault.
  2. Disconnect power and follow lockout/tagout procedures.
  3. Inspect the motor cable for damage or disconnected conductors.
  4. Verify that all three motor terminals (U, V, and W) are securely connected.
  5. Measure continuity of the motor cable and motor windings.
  6. Repair or replace damaged wiring or the motor if required.
  7. If operating in scalar mode with a small motor, verify Parameter 31.19 – Motor phase loss and set it to No action if applicable.
  8. Restore power and reset the fault.
  9. Verify balanced motor current and normal operation.

3381 Output Phase Loss Check Table

Check PointAction
Motor cableConnect and inspect for damage
Motor terminalsTighten U, V, and W connections
Motor windingsCheck continuity
Motor connectorInspect for loose or damaged contacts
Output phase wiringVerify all three phases are present
Parameter 31.19Set Motor phase loss to No action if using a small motor in scalar mode
Drive operationConfirm balanced motor current and normal operation

Preventive Maintenance Tips

  • Periodically inspect motor cables for wear and insulation damage.
  • Tighten motor terminal connections during scheduled maintenance.
  • Protect motor cables from vibration and mechanical stress.
  • Verify motor winding condition during preventive inspections.
  • Ensure the motor is correctly matched to the drive size.
  • Use proper cable routing to prevent conductor damage.
  • Record recurring 3381 Output Phase Loss faults to identify intermittent wiring problems.
  • Review Parameter 31.19 after commissioning or motor replacement.
  • Maintain clean and corrosion-free terminal connections.
  • Follow ABB preventive maintenance recommendations for the ACS580 drive and motor.

Proper inspection of the motor cable, motor terminals, motor windings, and Parameter 31.19 – Motor Phase Loss will help prevent recurring 3381 Output Phase Loss Fault conditions in ABB ACS580 drives, ensuring reliable motor operation, balanced output current, and long-term system performance.

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