Description
🔧 A20B-2100-0804 — Description
📌 Full Technical Description
A20B-2100-0804 is a FANUC Alpha i spindle module control PCB used in high-power CNC spindle amplifier systems (aiSP / SPM series).
- Manufacturer: FANUC
- Part Number: A20B-2100-0804
- Type: Spindle control PCB (Type A / Type 1)
- Series: A20B-2100
- Application: CNC spindle amplifier (Alpha i series)
⚙️ Function (What it does)
- Acts as a main spindle control board inside the amplifier
- Handles:
- Spindle motor control logic
- Communication between CNC controller and spindle drive
- Internal signal processing and monitoring
- Coordination of power and feedback systems
👉 In simple terms:
It is the main control board that runs the spindle motor via the amplifier.
🔍 Technical Details (Important)
- Identified as:
- “Alpha i spindle module control PCB (Type A)”
- Installed in:
- aiSP spindle amplifier modules (Type I / Type A)
- Typically used in:
- High-voltage systems (~400V class)
- Around 15 kW spindle power range
👉 This means:
0804 is generally used in higher-power spindle drives compared to 0800/0801 variants.
🏭 Where it is used
- Installed inside:
- FANUC Alpha i spindle amplifiers (A06B-6141 / aiSP series)
- Works with:
- CNC controller boards (A20B / A16B series)
- Spindle motors in machining centers, lathes, milling machines
🧩 Series Context (Very Important)
Within the A20B-2100-08xx family:
- 0800 → Base spindle control PCB
- 0801 → PLC/add-on control board
- 0802 → Control/interface variant
- 0804 → High-power spindle control PCB (400V / larger kW systems)
👉 All are:
- Internal boards
- Not standalone
- Must match exact amplifier model
⚠️ Important Notes
- ❗ Not supplied separately (usually part of full spindle amplifier module)
- ❗ Often refurbished/exchange only
- ❗ Exact matching required (suffix + amplifier model)
Common failure symptoms:
- Spindle not rotating
- Spindle drive alarm
- Communication failure with CNC
👍 Summary
A20B-2100-0804 = FANUC Alpha i high-power spindle control PCB
➡️ Used inside aiSP spindle amplifier modules
➡️ Controls spindle motor operation and communication
➡️ Typically for 400V / higher kW spindle systems