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- We offer for this displayed device sale, exchange and repair services.
- Prices for Servo-/Spindle Motors are standard prices for standard repair (Repairprice from)
- Devices for sell or exchange, was preventively overhauled in our workshop.
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Detailed information about Yaskawa SGM Sigma 1 Servo Motor series
We offer serial repairs for this product series
- Repair of many electronic assemblies according to standardized repair procedures with documentation.
- A larger repair capacity is possible for the same or similar orders
- Target group: machine manufacturers, service companies and distributors
Access to years of experience, specialists and equipment.
Find out more about our series repairs
1. Overview
Proven AC servo motor of the Yaskawa Σ series: robust, precise and always reliable in CNC applications. Ideal for axis movements with high dynamics and continuous cycle operation.
- Device category/role: AC servo motor (synchronous, permanent magnet)
- Series/Class: Sigma, 200-V class
- Design: closed motor, natural convection, service-friendly terminal box
2. Model designation
- SGM = AC servo motor (Yaskawa)
- 08 = Power size approx. 0.75 kW
- V = Series/design variant (Sigma generation)
- 316 = Execution code (speed/inertia)
- S = Standard version (without special options)
3. Technical Data
| Feature | Value |
|---|
| Rated power | 750 W |
| Rated voltage | 200 V AC |
| Rated current | 4.4 A |
| Rated speed | 3000 r/min |
| Rated torque | 2.39 N·m |
| Insulation class | B |
| Encoder | TRD-Y2048 (incremental, 2048 ppr) |
| Cooling | Natural convection |
| Protection class | n. a. |
| Weight/Dimension | n. a. |
| Year of manufacture (example type plate) | 2000.06 |
4. Connections & Interfaces
- U / V / W: Motor terminals 3-ph AC to servo amplifier (e.g. SGDB-10DG)
- PE / Grounding: connect to ground over a large area and with low impedance
- Encoder connector: TRD-Y2048 (incremental, 5 V supply, A/B/Z tracks)
- Brake (optional): 24 V DC holding brake, separately switchable (if installed)
- Thermal protection: n. a.
- Notes: Route encoder cable separately from power, ground shield properly on both sides
5. Control board / Assemblies
- Stator with distributed windings (200-V class)
- Permanent magnet rotor with low moment of inertia
- Encoder assembly TRD-Y2048 (incremental encoder, 2048 ppr)
- Bearings: precision bearings, axial/radial play-free
- Seals: shaft seal/oil scraper depending on version
- Terminal box / connectors for power and feedback
6. Alarms & Troubleshooting
| Code | Bezeichnung | Typischer Befund | Prüfung | Abhilfe |
|---|
| A.10 | Overcurrent / heatsink overheated | Short circuit U/V/W, IGBT error, insufficient cooling | Insulation motor cable, IGBT test, check temperature | Repair power section/servopack, ensure cooling |
| A.30 | Regeneration error | Braking resistor open/incorrect, Reg transistor defective | Check RB circuit and parameters | Dimension/connect resistor correctly, repair servopack |
| A.32 | Regeneration overload | Frequent braking, RB power exceeded | Check Reg load on the monitor | Reduce cycle or design RB larger |
| A.40 | Overvoltage DC bus | Network too high, Reg path inactive | Network entry, wiring, RB circuit | Check network, activate/adjust RB dimension |
| A.41 | Undervoltage DC bus | Mains voltage too low/drop | Measure supply (under load) | Check supply line/transformer, stabilize supply |
| A.51 | Overspeed | Encoder/winding sequence incorrect, unstable control | Phase sequence U-V-W, encoder signal | Correct winding sequence, check encoder/cable, adjust controller values |
| A.71 | Overload: High load | Briefly far above rated torque | Analyze current/load profile | Check mechanics, adjust accelerations |
| A.72 | Overload: Continuous load | Continuously too high load | Check temperature/current trend | Reduce continuous load, if necessary, larger motor size |
| A.81 | Encoder backup error | Absolute data lost (if absolute) | Battery, supply | Replace battery/cable, reference run |
| A.83 | Encoder battery low | Battery < threshold | Battery voltage | Replace battery |
| A.84 | Encoder data error | Interference/damage to the encoder (moisture/bearings) | Encoder cable, signal quality, visual inspection | Replace encoder, renew seal/bearing |
| A.b3 | Current detection faulty | Current sensor error or motor disconnected | U/V/W line, sensor | Correct wiring, check servopack |
7. Typical applications
- CNC milling and turning machines (X/Y/Z axes)
- Handling and positioning axes in assembly systems
- Tool changers, feed and secondary axes with 3,000 r/min class
8. Service notes
- Cleanliness & tightness: Clean motor exterior, check seals for coolant/oil ingress
- Bearing condition: Check for noise/play early, replace preventively if necessary
- Encoder care: Keep encoder dry; check cables and connectors for tension/kinks
- Cable routing: Power separate from feedback, ground shield consistently
- Measurements: No insulation measurement via the encoder circuit; Megger only on the motor side according to the manufacturer's specifications
- Parameters & backup: Save drive parameters; provide for reference run/fine adjustment after intervention
9. Repair description
- Incoming inspection: Visual inspection (seals, connectors, cables), insulation and winding measurement, bearing noise/play, encoder signal quality (A/B/Z, 5 V)
- Disassembly & cleaning: Open housing, make rotor/stator accessible, remove oil/coolant residues, drying according to procedure
- Analysis: Bearing raceways, shaft/sealing surfaces, winding resistance/ESR check of internal components, encoder check for concentricity/pulse quality
- Repair: Replacement of worn bearings/seals, rework of the shaft/seal seats, replacement of the encoder (TRD-Y2048) in case of signal errors, renew connector/cable set
- Testing & load test: Run test up to rated speed, vibration and temperature monitoring, encoder scope (jitter/amplitude), electrical high-voltage and function tests on the original servopack (e.g. SGDB-10DG) under load profile
- Endurance test & conclusion: Continuous operation under practical load, documentation of current, temperature, vibration and encoder signal; final report with recommendations for operation and maintenance