04.07.2025 by Viktor Siebert
Case Study: Yaskawa SGDK-50AEA. Why the Replacement Drive Didn’t Work
A customer from Italy contacted us with a pressing issue: his Matsuura CNC machine had gone down due to a fault in the Yaskawa SGDK-50AEA Servopack.
In a hurry to get the machine running again, he purchased a used replacement unit online, same model, same type. But after installation, the drive didn’t work at all.
Frustrated and without support from the machine manufacturer, he turned to us. One of our experienced sales engineers quickly suspected a parameter compatibility issue and offered the customer a full analysis.
What the customer sent us:
- The original (defective) Servopack from the Matsuura machine
- The used replacement unit purchased online
In our lab, we performed:
- A full visual and diagnostic inspection
- A detailed parameter comparison between both units
The solution:
The replacement unit was actually not defective. But it came from a completely different machine type. Its internal parameter set was incompatible with the application on the customer’s Matsuura machine.
Typical mismatches included:
- Motor tuning values
- Torque and speed limits
- Encoder feedback configuration
- Control loop parameters
These differences prevented the drive from operating, or even initializing correctly.
We extracted the parameter set from the original unit and cloned it to the replacement device. After final testing and full load simulation, the drive was returned in perfect working condition.
The result:
- The machine was back in operation
- The customer learned: A drive is not plug-and-play parameters matter
- A follow-up order is already in discussion
Takeaway:
Yaskawa drives like the SGDK-50AEA require machine specific parameter configurations, tailored to motor, encoder, mechanical setup, and application logic.
Installing a “compatible looking” drive without verifying the parameter set will fail even if the hardware is fine.
Our service covers:
- Drive repair
- Parameter analysis and extraction
- Cross-device comparison
- Safe reprogramming and full load testing
Additional Information: Yaskawa SGDK-50AEA Servopack
For further details on our Yaskawa repair services, please visit here.
📞 Please feel free to contact us if you have any questions regarding your Yaskawa drive technology. Our experienced team is always available to assist you.
Alarm Messages & Troubleshooting – Yaskawa SGDK-50AEA
| Alarm Code | Description | Solution |
|---|
| 0x02 | EEPROM data error | Initialize the unit or reload the control settings |
| 0x03 | Main circuit detecting element error | Check the main power circuit and internal protection elements |
| 0x10 | Overcurrent / Short circuit | Inspect output cables, motor, and insulation |
| 0x20 | Fuse blown | Replace fuse, identify and eliminate root cause (e.g., short circuit) |
| 0x40 | Over-voltage in the DC bus | Stabilize DC bus voltage and check supply voltage quality |
| 0x41 | Low voltage | Verify incoming power supply voltage |
| 0x60 | Tune-up incomplete (with encoder connected) | Check encoder signals and connections, repeat automatic tune-up |
| 0x81 | Overspeed detected at the motor | Check encoder accuracy and configured speed limits |
| 0xC5 | Motor magnetic pole detection error | Re-initialize encoder or verify correct motor type |
| 0xF1 | Missing power line phase detected | Check phase sequence and power cable connections |
| 0xF2 | Power frequency deviation | Measure and verify power frequency (should be 50/60 Hz ±5%) |
Device Data – Yaskawa SGDK-50AEA
| Parameter | Value |
|---|
| Model | SGDK-50AEA |
| DC Input Voltage | 270–325 V |
| DC Input Current | 20.7 A |
| AC Output Voltage | 0–230 V |
| Output Phase | 3-phase |
| AC Output Current | 32.9 A |
| Rated Output Power | 5.0 kW (approx. 6.7 HP) |
| Manufacturer | Yaskawa Electric, Japan |
| Nameplate Identifiers | S/N: D0057G761710006O/N: 532168-30-6 |
