21.08.2025 by Viktor Siebert
Yaskawa SGDM-10DN AC Servopack – Reliability in Axis Control
The Yaskawa SGDM-10DN Servopack was sent in with the following issue:
The A-axis was supposed to move to its reference point, but the machine monitor showed a deviation of 7°, even though the axis did not move at all.
Shortly after, the error A-axis timeout appeared, and the machine entered emergency stop mode.
This indicated a feedback issue between motor and servopack, most likely caused by a fault in the servopack’s electronics.
Repair Process:
- Initial inspection & cleaning
- Visual inspection for dust, dirt, and oil.
- Cleaning with special emulsions, drying in thermal oven.
- Preventive replacement
- Replacement of critical components: electrolytic capacitors, optocouplers, transistors.
- Fan inspection and replacement if required.
- Repair execution
- Faulty modules were desoldered and replaced with verified original components.
- Control board recalibration performed.
- Testing
- Operation tested on dedicated test bench with reference motor and controller.
- Reference movement simulated to reproduce the customer’s fault.
- Thermal load tests at up to 55 °C.
- All results documented in detailed checklists and reports.
After successful testing, the unit was returned fully functional.
The customer also received recommendations for preventive maintenance.
Preventive Measures for Customers
- Regular cleaning of control cabinet and fans.
- Replace fans and filters every 2–3 years.
- Inspect cables and connectors, especially encoder lines.
- Perform insulation resistance tests after long downtimes.
- Keep cabinet sealed against humidity and oil mist.
- Schedule preventive overhaul during maintenance intervals.
Conclusion
The Yaskawa SGDM-10DN is a robust servopack for precise axis control.
In this case, the error symptoms seemed misleading: While the controller showed a deviation, the real cause was an interrupted feedback loop.
Thorough repair, preventive measures, and systematic testing ensure long-term reliability and help prevent costly downtime.
Further information such as price and delivery time for: Yaskawa SGDM-10DN AC Servopack
More details about our Yaskawa repair expertise can be found here: Yaskawa SIGMA II repairs by Industrypart
Similar models we regularly repair:
SGDM-50ADA
📞 Please feel free to contact us if you have any questions regarding your Omron drive technology. Our experienced team is always available to assist you.
Device Specifications (Electrical & Physical)
Yaskawa SGDM-10DN AC Servopack – Reliability in Axis Control
Technical Specifications
| Specification | Value |
|---|
| Model | SGDM-10DN |
| Input Voltage | 3-phase 380–480 V, 50/60 Hz |
| Input Current | 3.5 A |
| Output Voltage | 3-phase 0–480 V, 0–300 Hz |
| Output Current | 3.5 A |
| Output Power | 1 kW |
| Protection Class | IP1X |
| Operating Temperature | 0–55 °C |
| Manufacturer | Yaskawa Electric, Made in UK |
Application Environment & Compatible Devices
The SGDM-10DN belongs to the Σ-II (Sigma II) series and is typically used in CNC machines, machine tools, and automation systems.
It is particularly suited for precise axis control, here specifically for the A-axis (swivel axis).
These servopacks are compatible with Yaskawa SGMx servomotors.
Function Description
The servopack manages the power control between the power supply and the servomotor.
It precisely regulates torque, speed, and position while monitoring critical safety parameters such as current, voltage, and temperature.
By communicating with the machine controller, it enables fast motion sequences and exact positioning.
Alarm Messages and Troubleshooting
| Alarm Code | Description | Cause | Solution |
|---|
| A.02 | Parameter Breakdown | EEPROM data error | Initialize parameters, replace pack if needed |
| A.03 | Main Circuit Encoder Error | Faulty power circuit feedback | Check wiring, replace pack if needed |
| A.05 | Combination Error | Servo and servopack not compatible | Use correct combination |
| A.10 | Overcurrent / Heat Sink Overheated | Overcurrent or overheating | Improve cooling, check for shorts |
| A.30 | Regeneration Error | Faulty transistor or resistor | Check regenerative resistor |
| A.32 | Regenerative Overload | Resistor overload | Adjust capacity, review load |
| A.40 | Overvoltage | Excessive DC voltage | Check input supply |
| A.41 | Undervoltage | Low DC voltage | Inspect supply lines |
| A.51 | Overspeed | Speed exceeded | Review load, check wiring |
| A.71/A.72 | Overload High/Low Load | Excessive torque | Adapt load or motor size |
| A.F5/A.F6 | Motor Disconnection | Motor disconnected | Check cabling, reconnect motor |
Components
| Module/Board | Function |
|---|
| Power section (IGBT) | Motor power conversion and control |
| Control board | Signal processing and parameter control |
| Encoder interface | Position/speed feedback |
| Power supply board | Control electronics supply |
| Heatsink + fan | Cooling and thermal protection |