1 PC Used Fanuc A20B-2101-0355 PCB Board In Good Condition A20B21010355 A2OB-21O1-O355

A20B-2101-0355 | FANUC Alpha Spindle Control Panel PCB — A20B-2101 035x Spindle Control Family

A20B-2101-035x — The Alpha Spindle Control PCB Family

The A20B-2101-0355 is a spindle control board within the A20B-2101-035x family — the confirmed spindle control PCB range for FANUC Alpha series spindle amplifiers.

The 035x family confirmed across the A20B-2101 series:

Adjacent to the confirmed Alpha iSP control PCB (A20B-2101-0350), the A20B-2101-0355 serves a closely related spindle control function within the same Alpha series drive architecture.

Key Product Information

Alpha Spindle Drive Architecture

FANUC Alpha series spindle amplifiers use a modular PCB architecture where different boards handle distinct functions:

Control PCB: Executes the velocity control loop, serial communication with the CNC, and spindle protection functions.

Control panel PCB: Manages the operator-facing interface elements of the drive — the LED status display, alarm code display, and function selection inputs on the drive's front panel.

The A20B-2101-0355, described as a "spindle control panel" PCB, serves the panel interface function within the Alpha spindle drive — providing the display and control panel integration that lets engineers and operators monitor spindle drive status and read alarm codes directly from the drive unit.

Application Scenarios

Alpha spindle drive panel fault: A FANUC Alpha spindle amplifier develops a panel-related fault — the front panel display stops updating or displays incorrect alarm codes. The A20B-2101-0355 is identified as the panel PCB fault. Replacement restores correct drive status display.

Spindle drive maintenance: A FANUC Alpha spindle amplifier undergoes planned electronics maintenance. The A20B-2101-0355 spindle control panel PCB is replaced as part of the drive board renewal.

FAQ

Q1: How do I confirm A20B-2101-0355 is the correct board for my Alpha spindle drive?

Read the part number from the installed board's label. If it reads A20B-2101-0355, this is the confirmed replacement. Cross-reference with the applicable FANUC Alpha spindle amplifier maintenance manual's PCB installation diagram and spare parts list.

Q2: Is A20B-2101-0355 interchangeable with A20B-2101-0350?

A20B-2101-0350 is the Alpha iSP control PCB (Type A) for A06B-6141 drives. A20B-2101-0355 is a different spindle control panel board in the same 035x family. They are not directly interchangeable — each serves a specific circuit function within the spindle drive. Confirm the correct board from the installed unit's label.

Q3: Does replacing A20B-2101-0355 require spindle parameter re-entry?

Spindle parameters reside in the CNC's parameter memory, not in the drive's panel PCB. Replacing A20B-2101-0355 does not affect stored spindle parameters. After fitting the replacement, verify correct display function and alarm code operation.

Q4: What ESD precautions apply when handling A20B-2101-0355?

Handle with a grounded anti-static wrist strap on an ESD-safe surface. Store in anti-static packaging. Power down the spindle drive completely and verify DC bus discharge before accessing internal boards — spindle drive DC bus voltage can exceed 600V.