3181 Wiring or Earth Fault in ABB ACS560 Drive VFD

3181 – Wiring or Earth Fault in the ABB ACS560 Drive VFD indicates that the drive has detected an incorrect power wiring connection or an earth (ground) fault. This fault most commonly occurs when the input power supply has been mistakenly connected to the drive's motor output terminals (U2, V2, W2) instead of the input terminals (U1, V1, W1).

3181 Wiring or Earth Fault in ABB ACS560 Drive VFD


To protect the inverter power stage from damage, the drive immediately trips and displays Fault 3181.

Possible Causes

  • Input power cable connected to the drive motor output terminals.
  • Incorrect input power wiring.
  • Motor cable connected to the wrong terminals.
  • Earth (ground) fault in the motor.
  • Earth fault in the motor cable.
  • Incorrect wiring after installation or maintenance.
  • Loose or damaged power cable connections.
  • Internal wiring error.

Solutions

  1. Check the input power connections.
  2. Verify that the three-phase supply is connected to the drive input terminals (U1, V1, W1).
  3. Verify that the motor is connected only to the output terminals (U2, V2, W2).
  4. Inspect the motor cable for wiring errors.
  5. Check the motor and motor cable for an earth (ground) fault.
  6. Tighten all power terminal connections.
  7. Correct any incorrect wiring before re-energizing the drive.
  8. Reset the fault and verify normal operation.

Additional Information

The ABB ACS560 continuously monitors the power connections during startup. If the drive detects that the incoming supply has been connected to the motor output terminals, or if an earth fault is present, it generates Fault 3181 to prevent damage to the inverter.

Incorrect connection of the input supply to the output terminals can severely damage the drive if power remains applied.

Common Symptoms

  • Drive displays 3181 Wiring or Earth Fault.
  • Drive trips immediately after power-up.
  • Motor does not start.
  • Fault appears after installation or rewiring.
  • Incorrect terminal wiring is found.
  • Earth leakage may be detected.
  • Drive remains in fault state until wiring is corrected.

Recommended Troubleshooting Sequence

  1. Verify that the displayed fault is 3181 Wiring or Earth Fault.
  2. Disconnect power and follow lockout/tagout procedures.
  3. Check that the input power is connected to U1, V1, W1.
  4. Verify that the motor is connected to U2, V2, W2.
  5. Inspect the motor cable for incorrect wiring.
  6. Measure the insulation resistance of the motor and motor cable to check for earth faults.
  7. Tighten all power terminal connections.
  8. Restore power, reset the fault, and verify normal drive operation.

3181 Wiring or Earth Fault Check Table

Check PointAction
Input power wiringVerify connection to U1, V1, W1
Motor wiringVerify connection to U2, V2, W2
Motor cableInspect for wiring errors or damage
Earth faultMeasure motor and cable insulation resistance
Power terminalsTighten all connections
Wiring diagramConfirm installation matches ABB documentation
Drive operationVerify normal startup after correction

Preventive Maintenance Tips

  • Verify all power connections before energizing the drive.
  • Clearly label input and motor cables during installation.
  • Measure motor insulation resistance during preventive maintenance.
  • Periodically inspect and tighten power terminals.
  • Avoid connecting or disconnecting cables with power applied.
  • Inspect motor cables for insulation damage.
  • Follow the ABB wiring diagram during installation and maintenance.
  • Record recurring 3181 faults to identify installation or wiring issues.
  • Train maintenance personnel on correct drive terminal identification.
  • Follow ABB preventive maintenance recommendations for the ACS560 drive.

Proper verification of the input power wiring, motor output connections, motor cable, and earth insulation will help prevent recurring 3181 Wiring or Earth Fault faults in ABB ACS560 Drive VFDs, ensuring safe installation, reliable operation, and protection of the drive's power electronics.

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