Repair of Mitsubishi Servo Motors

HC KFS HC UFS HC MF HC MFS
HC SFS HC PQ HC RFS

Mitsubishi Servo Motors

We test and repair Mitsubishi servo motors.
Additionally, we offer service for Mitsubishi servo motors.
Video: Test and repair of the Mitsubishi servo motor of the HC KFS/UFS/MF/MFS/SFS/PQ/RFS series by industrypart GmbH
Video: Test and repair of the Mitsubishi servo motor of the HC KFS/UFS/MF/MFS/SFS/PQ/RFS series by industrypart GmbH

We specialize in the following motor series:

  • HC..S-.. (Example: HC53S-SZ, HC153S-A42)
  • HC-KFS (Example: HC-KFS43, HC-KFS73)
  • HC-UFS (Example: HC-UFS13, HC-UFS43K)
  • HC-MF (Example: HCMF73-S15, HC-MF43-S15)
  • HC-MFS (Example: HC-MFS43, HC-MFS73K)
  • HC-SFS (Example: HC-SFS102, HC-SFS352)
  • HC-PQ (Example: HC-PQ13, HC-PQ43)
  • HC-RFS (Example: HC-RFS153, HC-RFS103)

Our repair process is preventive and includes several steps to ensure high repair quality.

Fault Analysis and Localization

What can you do?

Servo Motor Faults

Possible Solutions and Tips

  • Remove the motor from the shaft or belt and test at various speeds.
  • Disconnect the motor connection cables and completely free the motor from loads. Then turn it by hand.
    If the motor is still stiff or makes unusual noises, the ball bearings may be defective.
  • Check the motor for insulation and winding faults.
  • Check the encoder.

More error messages can be found in the alarm list available for download at the end of the form.

Possible Solutions and Tips

  • Visually inspect the encoder area for contamination, if necessary have it cleaned by a specialized company.
  • Check encoder signals: For older motors with analog encoders, read the sine diagrams with an oscilloscope.
    For serial encoders, also check the operating voltages.
  • Have the encoder replaced

More error messages can be found in the alarm list available for download at the end of the form.

Possible Solutions and Tips

  • Replace the motor for testing.
  • Check cable connections.
  • Remove the motor from the shaft or belt and test at various speeds.
  • Check or replace the drive.
  • Perform insulation testing on the motor.
  • Visually inspect the motor.
  • Visually inspect the encoder area for contamination, optionally have it cleaned by a specialized company.
  • Check encoder signals: For older motors with analog encoders, read the sine diagrams with an oscilloscope.
    For serial encoders, also check the operating voltages.

If these measures do not help, the fault is usually due to a faulty encoder or worn ball bearings.

More error messages can be found in the alarm list available for download at the end of the form.

Possible Solutions and Tips

  • Remove the motor from the shaft or belt and test at various speeds.
  • Disconnect the motor connection cables and completely free the motor from loads. Then turn it by hand.
    If the motor is still stiff or makes unusual noises, the ball bearings may be defective.
  • Check the motor for insulation and winding faults.
  • Check the encoder.

More error messages can be found in the alarm list available for download at the end of the form.

Possible Solutions and Tips

  • Visually inspect the encoder area for contamination, if necessary have it cleaned by a specialized company.
  • Check encoder signals: For older motors with analog encoders, read the sine diagrams with an oscilloscope.
    For serial encoders, also check the operating voltages.
  • Have the encoder replaced

More error messages can be found in the alarm list available for download at the end of the form.

Handling Parameters

When parameterizing, it is crucial to secure the settings early and document jumper and key settings.
Parameter is set on the device

What should be considered when parameterizing?

  • In most cases, motor parameters are stored in the drive or controller.
  • Obtain the appropriate documentation or software for setting the parameters.

The Typical Repair Process for Mitsubishi Servo Motors

The repair process for servo motors includes the following steps:

  • Preventive overhaul - replacement of all necessary defective and worn parts. Renewal of ball bearings and seals.
  • Intensive cleaning, paint stripping, and degreasing.
  • Repainting.
  • Comprehensive final and long-term tests at our test stations with subsequent final adjustment.
  • Completion of documentation and checklists.

High-quality Spare Parts for High-quality Repairs

Thousands of spare parts in stock available to the technician. Besides replacing worn components, refurbishing worn parts is sensible, as complex investment goods often contain valuable individual parts. Replacing these with new parts consumes valuable resources and incurs high costs.

For Mitsubishi Servo Motors, we replace

  • Encoders
  • Encoder cables
  • Encoder connectors
  • Resolvers
  • Brakes
  • Ball bearings
  • Shaft seals
  • O-rings
  • Power cables
  • Power connectors

Additionally, we proactively replace certain components that have proven to be prone to recurring defects.

To prevent bottlenecks and product discontinuations, we monitor our inventory using process-oriented software solutions. We pre-order some parts in advance and secure enough spare parts for serial repairs for up to a year.

Quality and Level of Repair

Professional repairs require the use of a test station. For each new series, a custom and complex test setup is developed. The devices are thoroughly checked for functionality by undergoing a long-term test.
Final test with the test drive.

The test takes place on a state-of-the-art test station that almost completely replicates the workflows of a real processing machine with Mitsubishi control.

Tests include:

  • Encoder connection
  • Alarm conditions
  • Speed
  • Current and voltage consumption
  • Temperature
  • Vibration
  • Noise level

We continuously expand our repair portfolio with new series

As drive and power electronics are often discontinued early, there are supply bottlenecks and you may be under pressure to procure replacements for your customers in time. We support you in analyzing bottlenecks and work together to find optimal solutions.

The typical process includes:

  • Development of test stations and procedures.
  • Organization of spare parts.
  • Preventive repairs at the component level.
  • If necessary, re-engineering or redevelopment of modules or entire devices.
HA_HC_Series_Motors.pdf (6.27 MB)
MR_J2S_A ver.C _ ENG.pdf (5.17 MB)

You can contact us in the following way:

Chat with our customer support, write us a message: [email protected] or call us: +49 6251 9888430

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Service company for drives and motors.

Service company for drives and motors.


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