FANUC A20B-8200-045 is a motor-mounted servo encoder and pulse-coder assembly that provides position and speed feedback in compatible FANUC AC servo systems. It is an internal motor feedback component, not a CNC main control board.

Use the complete identifier A20B-8200-045 for replacement. A20B8200045 is included only as an auxiliary search reference. Confirm the resolution and feedback format from the original motor and encoder configuration.

A20B-8200-045 Product Information

Servo Feedback Function

The A20B-8200-045 detects motor rotation and returns feedback to the servo-control system, allowing the amplifier and controller to regulate speed, direction and axis position. Faults may cause feedback alarms, unstable motion or incorrect positioning.

Exact Model and Motor Compatibility

A20B-8200-045 and A20B-8200-0450 are different identifiers. Do not select by appearance alone. Confirm the A20B number, complete host-motor nameplate, connector, mounting pattern, coupling interface and machine or robot configuration.

Testing and Installation Notes

REACO CNC checks the label, housing, circuit board, connector, mechanical condition, signal feedback and rotation response on a compatible test setup as applicable. Supplied parts should match the quotation or product photos.

Qualified personnel should isolate power, protect the encoder from impact, static electricity and contamination, and preserve its alignment. Encoder initialization, axis mastering or reference return may be required after replacement.

Related resources: FANUC servo encoders, FANUC CNC and robot parts and FANUC encoder repair services.