1. General Information

• Part Number: A16B-1100-0450 / 01A

• Board ID: A320-1100-T454/01

• Manufacturer: FANUC

• Type: AC Servo Drive Control PCB (servo card)

• Application: FANUC CNC systems (typically 0, 16, 18, 21 series), α/αi servo amplifier units

• Function: Servo motor current/position loop control, PWM generation, encoder feedback processing, CNC–servo interface, alarm detection

• Revision: 01A (hardware revision)

2. Key Specifications

• Power Supply: +5 V DC (±5%, ~2.0 A), ±15 V DC (±10%)

• Control Axes: Single-axis servo control

• Feedback: Serial α/β/αi encoder input

• Command Interface: ±10 V analog speed command + digital servo I/O

• Logic: 4-layer FR-4 industrial PCB, high-density SMT

• Power Consumption: ~18–22 W

• Weight: Approx 0.5–0.6 kg

3. Mechanical & Environmental

• Dimensions (H×W): ~220 × 160 mm

• Mounting: Vertical installation inside FANUC servo amplifier cabinet

• Operating Temperature: 0 °C to +55 °C

• Storage Temperature: −20 °C to +60 °C

• Humidity: 10%–95% RH, non-condensing

• Cooling: Forced air cooling (servo internal fan required)

4. Main Functions

1. Single-Axis Servo Control: Executes current loop, speed loop, and position loop for one servo axis

2. PWM Signal Generation: Drives IGBT power modules for motor current control

3. Encoder Signal Processing: Receives and decodes serial encoder data for position/speed feedback

4. CNC Communication: Converts CNC commands to drive signals; provides opto-isolated I/O

5. Alarm & Status Monitoring: Onboard LEDs for power, servo ready, and fault indication

5. Compatibility

• Servo Amplifiers: FANUC α series, αi series servo units

• CNC Systems: FANUC 0, 16, 18, 21 series

• Motors: α/αi AC servo motors (0.5 kW–7.5 kW)

• Replacement: Interchangeable with A16B-1100-0450 (same revision or later)

6. Common Alarms

• SV-01: Overcurrent (motor short, wiring fault, IGBT failure)

• SV-02: Overvoltage (regeneration fault, DC bus surge)

• SV-03: Undervoltage (power supply fault, fuse blown)

• SV-04: Overheat (fan failure, heatsink blocked)

• SV-05: Speed deviation (encoder fault, motor overload)

• SV-06: Encoder signal error (cable break, encoder damage)

7. Handling & Maintenance

• ESD Protection: Always use anti-static wristband when handling

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

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

• Power Check: Verify +5 V and ±15 V stability before power-up

• Connector Care: Ensure pins are clean and free of oxidation

8. Safety Notes

• High Voltage: Power off servo and discharge DC bus capacitors (≥10 minutes) before service

• Qualified Personnel: Only trained technicians may perform installation/maintenance

• Genuine Parts: Use FANUC OEM replacements for reliability and safety