Product Short Description
Product Name: FANUC A860-2109-T302 Alpha i Series Position Coder / Encoder
Product Introduction: Factory encoder (position coder) for FANUC Alpha i AC servo and spindle motors, providing high-resolution rotor angle feedback to FANUC CNC servo drives.
Technical Specifications:
- Model: A860-2109-T302
Description
- Series: FANUC Alpha i
- Type: position coder / incremental-serial encoder (some listings show 1024 PPR sin/cos, others show serial Alpha i protocol)
- Max speed: 10,000 rpm
- Flange: 68 mm square
- Supply: 24 VDC typical
- Output: serial position protocol to FANUC drive (not open-collector A/B standalone)
- Protection: IP65 (IP67 in some distributor listings)
- Operating temp: 0 to 55 °C (some listings -10 to 55 °C)
- Weight: approx. 0.41 kg
Functional Features: High-speed rated for spindle feedback; serial protocol eliminates separate counter board; dust/oil resistant sealing for machine-tool coolant environment; direct mount on Alpha i motor rear.
Application Scenarios: FANUC CNC machining centres, turning centres, grinders, milling spindles, robot servo joints using Alpha i motors.
Material & Structure: Industrial plastic+metal housing, 68 mm square mounting flange, O-ring shaft seal, serial encoder PCB, shielded cable exit.
Working Principle: Rotary disc / magnetic scale generates position data; on-board ASIC serialises angle and transmits to FANUC servo drive over dedicated encoder bus; drive uses it for commutation and servo loop.
Installation Requirements: Align to motor pilot diameter; tighten flange screws to FANUC torque; use original FANUC encoder cable; never rotate disc independently of motor during mesh.
Usage Notes: Do not open housing — calibration lost; oil seal must face coolant side; mismatched firmware motor/encoder combo throws 9xx alarm; handle by housing, not cable.
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