1. General Information

• Model: A16B-1100-0070/02A

• Manufacturer: FANUC

• Type: Digital Spindle Control Board (PCB)

• Series: S‑series AC spindle drive (older generation)

• Application: CNC machine tools, spindle motor control (1S–3S series)

• Revision: /02A (hardware version)

2. Specifications

• Function: Digital control, speed/position loop, I/O interface, protection logic

• Signal Processing: Closed‑loop vector control, serial encoder feedback

• Power Supply: +5 V, ±15 V (from drive power unit)

• Control Signals: Spindle enable, direction, speed command, alarm output

• Feedback Interface: Serial spindle encoder (α or β type)

• Protection: Overcurrent, overvoltage, overheat, speed deviation, encoder fault

3. Mechanical & Environmental

• Dimensions (H×W×D): Approx 230 × 160 × 30 mm

• Weight: Approx 1.5 kg

• Mounting: Vertical installation in spindle drive unit

• Operating Temp: 0 °C to +55 °C

• Storage Temp: −30 °C to +85 °C

• Humidity: 10%–90% RH, non‑condensing

• Cooling: Natural convection (drive internal airflow)

4. Compatibility

• Spindle Drives: FANUC S‑series AC spindle servo units (medium/large size)

• Spindle Motors: 1S, 2S, 3S series AC spindle motors

• CNC Systems: Compatible with FANUC 0‑series, 16/18/21‑series (legacy)

5. Common Alarms & Troubleshooting

• SP‑01: Spindle overcurrent → Check motor insulation, wiring, or power module

• SP‑02: Overvoltage → Check input voltage, regeneration circuit

• SP‑03: Undervoltage → Check power supply, fuses, wiring

• SP‑04: Overheat → Check cooling fan, heat sink, ambient temp

• SP‑05: Speed deviation → Check encoder, wiring, motor load

• SP‑06: Encoder communication error → Check encoder cable, connector

6. Maintenance

• Visual Inspection: Check for burnt components, swollen capacitors, loose connectors

• Cleaning: Remove dust from PCB surface and connectors every 3–6 months

• Connector Check: Ensure all pins are secure and free of oxidation

• Voltage Check: Verify +5 V and ±15 V supply voltages

• Encoder Test: Check encoder signal quality and wiring integrity

7. Safety Notes

• High Voltage: Ensure drive is fully powered off and capacitors discharged before service

• ESD Protection: Use anti‑static wristband when handling PCB

• Qualified Personnel: Only trained technicians should perform maintenance

• Genuine Parts: Use only FANUC original replacement parts