24.08.2025 by Viktor Siebert
Mitsubishi Servo Drive Unit MDS-C1-V2-1010 typically damaged by defective fan
Repair Story.
The unit was delivered in a heavily contaminated condition. Already during the first inspection it became clear that the fan was completely blocked. Due to the accumulated dirt, it could no longer rotate mechanically.
A detailed analysis confirmed the suspicion:
The fan failure caused insufficient cooling of the electronics. As a result, the power electronics were exposed to thermal stress, the electrolytic capacitors dried out, and finally the driver electronics and the transistor module failed.
Customer symptoms:
- Unit would not start
- Display remained dark
- No functionality
Repair Process
- Cleaning: Complete removal of dust, oil residues, and metallic particles.
- Diagnosis: Verification of control and power boards.
- Replacement: defective capacitors, transistor module, and damaged driver circuits.
- Preventive replacement: critical components such as relays and driver ICs were replaced as precaution.
- Testing:
- insulation resistance test
- function tests with different motor loads
- thermal stress tests on our test bench
- Documentation: All work steps were recorded in checklists and test protocols.
Result
The unit was successfully repaired. The customer was impressed and decided to have additional modules of the same machine overhauled, which perfectly coincided with the company’s summer break.
Preventive Measures for the Customer
- Regular cleaning of fans and air ducts
- Fan replacement every 3–5 years depending on conditions
- Insulation resistance tests as part of maintenance cycles
- Seal inspections and replacement if worn
- Thermal monitoring during operation to detect early component aging
Conclusion
The repair of the MDS-C1-V2-1010 demonstrates how critical preventive maintenance is. A simple fan replacement could have prevented this costly failure. Nevertheless, the unit was restored, and the machine was put back into operation.
For the customer this means: extended service life, reduced downtime, and predictable maintenance costs.
To mentioned Mitsubishi Drive: Mitsubishi MDS-C1-V2-1010
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Mitsubishi drive Repair by Industrypart
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Technical Specifications
| Parameter | Value |
|---|
| Type | MDS-C1-V2-1010 |
| Power | 1.0 / 1.0 kW |
| Input Current | 14 A DC 270–311 V |
| Input Voltage | 0.2 A 1PH 200/200–230 V, 50/60 Hz |
| Output Current | 6.8 / 6.8 A 3PH 155 V, 0–240 Hz |
| Standard | DIN VDE0160 |
| Manual Reference | BNP-C3000 |
| Hardware Version | A |
| Weight | approx. 5–6 kg (series typical) |
| Dimensions | approx. 300 x 130 x 250 mm |
Operating Environment & Compatible Devices
The MDS-C1-V2-1010 unit belongs to the Mitsubishi MDS-C1 series and is typically used in Mazak CNC machines and other high-precision machine tools.
- Ambient temperature: 0–55 °C (optimal lifespan < 40 °C)
- Relative humidity: 20–90 % (non-condensing)
- Requires clean, well-ventilated control cabinets
Compatible devices:
- Mitsubishi servo motors from the HF and SJ series
- Mazak machining centers (e.g., Variaxis, Integrex, Nexus)
Functional Description
The MDS-C1-V2-1010 is a servo drive unit that precisely controls servo motors.
It converts input voltage into three-phase output voltage for the motor and ensures:
- precise control of torque, speed, and position
- feedback monitoring through encoders
- protection functions against overcurrent, overvoltage, and overheating
The unit is integrated with the NC controller and continuously monitors operating conditions.
Alarm Messages and Troubleshooting
| Alarm | Description | Cause | Solution |
|---|
| 12 | Memory Error | Memory fault in the driver | Restart unit, replace if error persists |
| 14 | Software Processing Error 2 | Process not completed | Check firmware, replace driver if necessary |
| 17 | A/D Converter Error | Fault in A/D converter | Replace unit or check controller |
| 21 | No Signal 2 | No encoder feedback | Check cable/encoder, replace motor if required |
| 25 | Absolute Position Lost | Absolute data lost | Check battery, reset system |
| 32 | Power Module Overcurrent | Overcurrent in IPM detected | Check motor and IPM, replace module |
| 42 | Feedback Error 1 | Encoder signal failure | Check encoder/cables, secure connection |
| 46 | Motor Overheat | Excessive motor temperature | Reduce load, check cooling |
| 50 | Overload 1 | Current overload | Reduce load, check motor and drive |
| 58 | Collision Detection 0 | Collision detected in machine | Inspect machine, resolve mechanical issue |
Components
| Type | Board designation | Quantity |
|---|
| Control Board | RK112A-12 or BN634A980G51 B | 1 |
| Power Board | RK156B-V24-1010 or BN634A811G51 | 1 |