Fanuc A20B-2901-098 Spindle Control Circuit Board

High-performance control board designed to regulate spindle motor speed and operation in Fanuc Series 16/18 CNC systems.

Model Number: A20B‑2901‑098
Board Type: Spindle control/interface board
System Compatibility: Fanuc Series 16/18 CNC systems (used in milling, turning, grinding machines)
Function: Manages spindle drive signals including speed feedback, acceleration/deceleration control, direction commands, and fault diagnostics
Input/Output Signals: Encoder/checksum inputs, drive command outputs, limit and interlock inputs
Protection: Includes overvoltage, overcurrent, and thermal fault monitoring circuitry
Diagnostic Features: Onboard LEDs indicate power, control activity, fault conditions, and spindle enable status
Construction: Multilayer industrial-grade PCB with isolated ground planes and high-reliability components
Mounting Format: Plug-in board slot for standard yellow Fanuc modular chassis
Cooling Method: Passive cooling assisted by rack ventilation; may include thermal pads or heat spreaders
Connectors: Rear edge connector for rack bus and front/back terminal blocks for field wiring
Country of Manufacture: Japan (Fanuc Ltd.)
Typical Use Case: Precision spindle control in CNC machine tools, retrofits, repair, and upgrades for Fanuc-based systems Please review pictures carefully and let us know if you have any questions!