F1 Overcurrent Fault in Siemens SINAMICS V20 Drive

F1 – Overcurrent in the Siemens SINAMICS V20 Drive indicates that the output current has exceeded the drive's allowable limit. To protect the inverter power module (IGBTs) and the motor, the drive immediately trips and disables the output.

F1 Overcurrent Fault in Siemens SINAMICS V20 Drive


This fault is commonly caused by motor overload, short circuits, ground faults, incorrect motor parameters, or acceleration/deceleration settings that are too aggressive.

Possible Causes

  • Motor overload.
  • Acceleration time too short.
  • Deceleration time too short.
  • Output short circuit.
  • Ground (earth) fault in the motor or motor cable.
  • Incorrect motor parameter settings.
  • Motor locked or jammed.
  • Incorrect motor wiring.
  • Drive undersized for the application.
  • Defective IGBT power module (less common).

Solutions

1. Check the Motor Load

  • Ensure the motor is not overloaded.
  • Remove any mechanical blockage or excessive load.

2. Increase the Acceleration and Deceleration Time

  • Increase the acceleration ramp time.
  • Increase the deceleration ramp time if necessary.

3. Check the Motor and Motor Cable

  • Inspect the motor cable for short circuits.
  • Check for phase-to-phase shorts.
  • Check for earth (ground) faults.
  • Measure the motor insulation resistance.

4. Verify Motor Wiring

  • Confirm that the motor is correctly connected to the drive output terminals.
  • Tighten all motor terminal connections.

5. Check Motor Parameters

  • Verify that the motor nameplate data has been entered correctly.
  • Confirm the rated voltage, current, frequency, and speed settings.

6. Inspect the Drive

  • If all external checks are satisfactory and the fault persists, inspect the IGBT power module and internal power circuit.
  • Repair or replace the drive if a hardware fault is confirmed.

Additional Information

The SINAMICS V20 continuously monitors the motor output current. When the current exceeds the internal protection threshold, the drive generates F1 – Overcurrent to prevent damage to the inverter and motor.

Typical causes include:

  • Mechanical overload.
  • Short circuit.
  • Earth fault.
  • Incorrect commissioning parameters.
  • Motor stall.
  • Power module failure.

Repeated resetting without correcting the cause may damage the drive.

Common Symptoms

  • Drive displays F1 – Overcurrent.
  • Motor stops suddenly.
  • Drive trips during acceleration.
  • Drive trips immediately after starting.
  • High motor current.
  • Repeated overcurrent trips under load.

Recommended Troubleshooting Sequence

  1. Verify that the displayed fault is F1 – Overcurrent.
  2. Disconnect power and follow lockout/tagout procedures.
  3. Check the motor for mechanical overload or jamming.
  4. Inspect the motor cable for short circuits or earth faults.
  5. Measure the insulation resistance of the motor and motor cable.
  6. Verify all motor wiring connections.
  7. Check the motor nameplate parameters entered in the drive.
  8. Increase the acceleration and deceleration times if required.
  9. Reset the fault and test the drive.
  10. If the fault persists, inspect the drive's IGBT power module and internal hardware.

F1 Overcurrent Check Table

Check PointAction
Motor loadRemove overload or mechanical jam
Acceleration timeIncrease ramp time
Deceleration timeIncrease ramp time if required
Motor cableCheck for short circuit or damage
Ground faultMeasure insulation resistance
Motor wiringVerify correct connections
Motor parametersCompare with motor nameplate
IGBT moduleInspect if fault persists
Drive hardwareRepair or replace if defective
Drive operationConfirm normal operation after repair

Preventive Maintenance Tips

  • Avoid sudden acceleration of high-inertia loads.
  • Enter correct motor nameplate data during commissioning.
  • Periodically inspect motor cables for insulation damage.
  • Check motor terminal connections regularly.
  • Measure motor insulation resistance during preventive maintenance.
  • Ensure the drive is correctly sized for the application.
  • Keep the drive clean and adequately cooled.
  • Record recurring F1 faults to identify developing mechanical or electrical issues.
  • Follow Siemens preventive maintenance recommendations for the SINAMICS V20 Drive.

Proper inspection of the motor load, motor cable, ground insulation, motor parameters, acceleration/deceleration settings, and IGBT power module will help prevent recurring F1 – Overcurrent faults in Siemens SINAMICS V20 drives, ensuring reliable operation and protecting both the drive and motor.

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