1 PC Used Fanuc A20B-2100-0540 In Good Condition A20B21000540 A2OB-21OO-O54O

A20B-2100-0540 | FANUC Alpha SVM1 FSSB Control PCB — A06B-6096 / HRV3 / LCD Display / 2A to 130A / Supersedes A20B-2100-0250

One Control Board Covers the Full SVM1 FSSB Range

The FANUC Alpha SVM1 with FSSB interface (A06B-6096 series) spans a wide range of output current ratings. Despite this span, the A20B-2100-0540 is the common control PCB across all models — from the smallest SVM1-2 to the largest SVM1-130S.

The wiring board varies with the current rating (different IGBT devices and current sensor hardware). But the A20B-2100-0540 control board runs the same FSSB interface, HRV3 current control algorithm, and LCD alarm functions for all of them. This simplifies spare parts: one A20B-2100-0540 serves every SVM1 FSSB drive in the fleet.

Key Specifications

LCD Display — At-the-Drive Diagnostics

CNC-Shopping confirms the A20B-2100-0540 "has a LCD Display indicator to display the STATUS or Alarm number of your Fanuc SVM-1 Module."

In a machine tool cabinet with multiple SVM1 drives, this display is a practical diagnostic tool. Without it, identifying which specific drive has an alarm requires navigating the CNC alarm screen and cross-referencing axis assignments. With the front-face LCD:

• The alarm appears directly on the affected drive
• Maintenance can identify the problem drive immediately — no CNC menu navigation needed
• Status codes confirm the drive's operational state even when the CNC is not powered

Application Scenarios

SVM1 FSSB control board fault: A FANUC Alpha SVM1-40L (A06B-6096-H104) develops an FSSB communication alarm. The wiring board is intact. Replacing the A20B-2100-0540 control board restores FSSB communication and HRV3 current control.

Multi-drive cabinet maintenance: A machining centre cabinet has six SVM1 FSSB drives of different current ratings. When control boards need replacement, a single A20B-2100-0540 is the correct board for all six — regardless of whether they are SVM1-12, SVM1-40L, or SVM1-80 variants.

FAQ

Q1: Does A20B-2100-0540 replace A20B-2100-0250 directly?

A20B-2100-0540 supersedes A20B-2100-0250. The GE Fanuc Alpha Series manual lists A20B-2100-0250 as the old specification and A20B-2100-0540 as the current specification for the same drive control board position. For most A06B-6096 SVM1 drives, the A20B-2100-0540 is the correct replacement for a failed A20B-2100-0250. Verify from the drive's maintenance documentation that no wiring board update is also needed.

Q2: What is the Daito LM fuse on the A20B-2100-0540?

The Daito LM is a self-resetting fuse on the control board protecting the 24V control power circuit. If 24V control power experiences an overcurrent event, the fuse trips and interrupts power to the drive's control circuits. After fixing the wiring fault causing the overcurrent, the fuse resets. A drive that appears completely dead (no LED, no display) after a wiring fault should have its Daito fuse checked before assuming the control board has failed.

Q3: Does replacing A20B-2100-0540 affect servo parameters?

No. Servo parameters reside in the CNC's main parameter memory. After fitting the replacement board, the CNC re-establishes FSSB communication and applies the existing servo parameters to the new control board. No parameter re-entry is required. Run low-speed tests after replacement before returning to full production.

Q4: What FANUC CNC systems are compatible with SVM1 FSSB drives that use A20B-2100-0540?

The A06B-6096 SVM1 FSSB drives are used with FANUC CNC systems that have FSSB servo interfaces — including Series 16i, 18i, 21i, 0i-B, 0i-C, and related systems equipped with FSSB servo cards. The A20B-2100-0540 control board's FSSB interface is compatible with the FSSB implementation across this CNC range.

Q5: Is A20B-2100-0540 used in robot applications as well as CNC machining?

The A06B-6096 SVM1 FSSB series is confirmed for CNC machine tool applications. FANUC Alpha series servo drives are also used in some robot and special machine applications. Whether A20B-2100-0540 appears in robot applications depends on whether the specific robot system uses A06B-6096 series drives. Confirm the host system type from the drive module's documentation before ordering.