Yaskawa · Servo motors
SGM7J-04AFC6S — Sigma-7 400 W servo motor: fault codes, repair & supply
The SGM7J-04AFC6S is a Yaskawa Sigma-7 400 W servo motor. Faults are usually shown by the SERVOPACK as encoder, overload or position errors. Star Automations sources and supplies the SGM7J-04AFC6S and repairs failed units at component level, so you can choose between a replacement and getting your existing unit restored. This is a current OEM line. Availability and price are confirmed per enquiry. Most quotes come back the same day — send the part number or the fault code on WhatsApp.
Common Yaskawa Sigma-7 fault codes and what we usually find
Fault code wording can differ by firmware and manual revision — always confirm against the manual for your exact unit. The causes below are typical findings, not a diagnosis of your specific unit.
| Code | Meaning | Typical cause |
|---|---|---|
| A.C90 | Encoder communications error | Encoder cable, connector or encoder fault |
| A.810 | Encoder backup alarm | Absolute encoder power lost, low battery |
| A.830 | Absolute encoder battery error | Low or disconnected battery |
| A.710 | Instantaneous overload | Mechanical jam, brake, overloaded axis |
| A.720 | Continuous overload | Sustained high load, wrong sizing |
| A.D00 | Position deviation overflow | Blocked axis, tuning, motor or encoder fault |
When a SGM7J-04AFC6S needs attention
- Encoder alarm on power-up
- Motor runs rough or vibrates
- Motor overheats
- Brake does not release (brake models)
- Oil or damage at the shaft seal
Replace or repair your SGM7J-04AFC6S
Source a replacement
Send the part number. We check sourcing from global surplus and the OEM channel and reply the same day with availability, condition and price. Advance or verified escrow applies.
Repair your existing unit
If sourcing takes longer or you want to keep your configuration, we repair at component level — power stage, gate-drive, control and supply sections — and test before dispatch.
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SGM7J-04AFC6S — common questions
Can you supply the SGM7J-04AFC6S in India?
Can a faulty SGM7J-04AFC6S be repaired instead of replaced?
My SGM7J-04AFC6S shows A.C90 (encoder communications error). What should I do?
Is the exact part number important?
Need the SGM7J-04AFC6S now?
Send the part number or fault code — we reply the same day. Serving Chennai, Puducherry, Bengaluru, Hyderabad, Delhi and pan-India.