1 PC Used Fanuc A20B-2001-0932 PCB Board A20B20010932 A2OB-2OO1-O932

A20B-2001-0932 | FANUC Alpha SVM1 Servo Control PCB — A06B-6079-H106 / Type A / 48V / 8-Segment Display / Supersedes A16B-2202-0790

Alpha SVM1 — The First-Generation Digital Servo Drive

The FANUC Alpha (α series) represents FANUC's original high-performance digital servo amplifier platform — predating the Alpha-i generation that followed. The A06B-6079 series SVM1 modules are the single-axis servo amplifiers for this platform.

The A20B-2001-0932 is the control PCB (front card) for these Alpha SVM1 modules — the intelligent board that:

Communicates with the CNC via Type A interface: The Type A interface predates FSSB (Fibre Optic Servo Serial Bus). It uses a different communication protocol for axis command and feedback — compatible with Series 16-A, 16-B, 18-A, 18-B, 21TA, and related pre-FSSB CNC systems.

Drives ALPHA servo motors via SVM1 modules: DNC Electronics confirms A20B-2001-0930 class boards serve "SVM1 modules from 12A to 80A, driving Alpha motors from A1/3000 through to A22/2000 size." The A20B-2001-0932 serves the same A06B-6079 SVM1 family.

Key Specifications

A20B-2001-093x Family — Alpha SVM1 Control PCBs

The A20B-2001-093x family is the control PCB group for the Alpha SVM1 (A06B-6079) single-axis modules:

The GE Fanuc Alpha Series Manual also lists A20B-2001-0932 as associated with SVM1-240 (H107) — noting it as part of the Alpha series' extended single-axis range.

Application Scenarios

Alpha SVM1 control board fault: A FANUC Alpha series machining centre develops servo communication alarms on a specific axis. The A20B-2001-0932 is identified as the fault from the drive module label. Replacement restores the axis.

Older CNC machinery maintenance: A production line running Series 16-B or 18-B CNC controls with A06B-6079 Alpha servo drives requires A20B-2001-0932 for continued operation — the Alpha generation predates Alpha-i but remains in service on many established machine tools.

FAQ

Q1: What is the difference between Type A and Type B (FSSB) interface for Alpha SVM1 drives?

Type A interface uses a dedicated serial link with parallel signal lines between the CNC and each servo amplifier. The CNC's Type A servo interface board connects to each drive with a cable. FSSB (Type B/FSSB) uses a fibre optic daisy-chain, reducing wiring complexity and providing total EMI immunity. The A20B-2001-0932 serves Type A interface drives (A06B-6079 series). The A20B-2100-0540 serves FSSB interface drives (A06B-6096 series). These are different hardware generations and the boards are not interchangeable.

Q2: Can A20B-2001-0932 replace the older A16B-2202-0790?

The GE Fanuc Alpha Series manual lists A16B-2202-0790 as the old specification and A20B-2001-0932 as the current/new specification for the same board position. For most Alpha SVM1 applications this is a direct replacement. Confirm compatibility from the applicable FANUC Alpha series maintenance manual before fitting.

Q3: What Alpha servo motors does the A06B-6079-H106 SVM1 module drive?

DNC Electronics confirms the A20B-2001-0930 class (same family) drives "Alpha motors from A1/3000 through to A22/2000 size." The specific current rating of the H106 module determines the compatible motor frame size. Confirm the motor specifications from the A06B-6079-H106 module documentation.

Q4: Does replacing A20B-2001-0932 affect servo parameters?

No. Servo parameters reside in the CNC's main parameter memory. After fitting the replacement A20B-2001-0932, the CNC re-establishes Type A servo communication and applies existing servo parameters. Verify normal axis response at low speed before returning to production.