Description
🔧 A20B-2100-0802 — Description
📌 Full Technical Description
A20B-2100-0802 is a FANUC spindle drive control PCB (printed circuit board) used in Alpha i spindle amplifier modules (aiSP / SPM series) in CNC machines.
- Manufacturer: FANUC
- Part Number: A20B-2100-0802
- Type: Spindle drive control / interface PCB
- Series: A20B-2100
- Application: CNC spindle amplifier module
⚙️ Function (What it does)
- Acts as an internal control PCB inside the spindle amplifier
- Handles:
- Spindle motor control logic
- Communication between CNC controller and spindle drive
- Internal signal processing and monitoring
- Coordination between control section and power section
👉 In simple terms:
It is a core control board that helps run and manage the spindle motor inside the amplifier.
🔍 Technical Identification (Verified)
- Described as:
- “FANUC circuit board / control PCB for amplifier”
- “FANUC spindle control PCB”
👉 This confirms:
It belongs directly to the spindle drive system (not a main CNC CPU or I/O board).
🏭 Where it is used
- Installed inside:
- FANUC Alpha i spindle amplifiers (A06B-6141 / 6111 series)
- Used in:
- CNC machining centers
- CNC lathes
- Milling machines
🧩 Series Context (Important)
Within the A20B-2100-08xx family:
- 0800 → Main spindle control PCB
- 0801 → PLC/add-on control board
- 0802 → Control/interface PCB variant (enhanced or configuration-specific)
👉 These boards are:
- Not standalone
- Always used inside spindle amplifier assemblies
⚠️ Important Notes
- ❗ Typically not supplied separately (part of full amplifier module)
- ❗ Often obsolete / refurbished only
- ❗ Must match:
- Exact spindle amplifier model
- Hardware version and suffix
Common failure symptoms:
- Spindle not rotating
- Spindle amplifier alarm
- CNC–spindle communication fault
👍 Summary
A20B-2100-0802 = FANUC Alpha i spindle drive control PCB
➡️ Installed inside spindle amplifier (aiSP / SPM)
➡️ Controls spindle motor operation and communication
➡️ Variant of 0800 / 0801 boards for specific configurations