Description
🔧 FANUC A20B-2100-0741 – Alpha i Servo Control PCB (2-Axis)
A20B-2100-0741 is a FANUC internal printed circuit board (PCB) used inside Alpha i (αi) servo amplifier modules. It is specifically a dual-axis servo control board that forms part of the internal electronics of a servo drive system.
🧠 What It Is
👉 A20B-2100-0741 = Alpha i SVM2 Dual-Axis Servo Control PCB
- Type: Servo control PCB (internal board)
- Series: Alpha i (αi) servo system
- Function Class: 2-axis (dual-channel) control board
- Installed inside aiSV / SVM2 servo amplifier modules
This board is not a standalone amplifier — it works inside a complete servo drive (like A06B-6114 / SVM2 modules).
⚙️ What It Does
This PCB acts as the main control/command board for a dual-axis servo amplifier:
- 🧠 Processes CNC commands for servo motion
- 🔄 Controls two servo axes simultaneously
- 📡 Manages communication between CNC controller and amplifier
- ⚙️ Coordinates:
- Encoder feedback signals
- Motor control logic
- Drive enable / fault signals
👉 In simple terms:
It is the “brain board” inside a 2-axis FANUC servo amplifier.
🏭 Where It Is Used
- Inside FANUC Alpha i servo amplifiers (SVM2 / aiSV series)
- Used in:
- CNC machining centers
- CNC lathes
- Multi-axis industrial machines
- Works with:
- Servo motors (αi series)
- Power supply modules (αi PS)
- Spindle drives (αi SP)
🔍 Key Characteristics
- ✔ Dual-axis (2-channel) control PCB
- ✔ Installed in servo amplifier module, not standalone
- ✔ Works across a wide current range (approx. 4A–160A systems depending on amplifier size)
- ✔ Typically not sold separately — replaced with full servo module
- ✔ Commonly repaired/refurbished instead of replaced individually