Fanuc A20B-2101-0025 Circuit Board A2OB21O1OO25 A20B21010025

A20B-2101-0025 | FANUC Beta iSVSP3-40/40/40-15i Triple-Axis Power PCB — A06B-6134-H303 / 3×40A Servo + 15kW Spindle / Power Wiring Card

Three Servo Axes and a Spindle — In a Single Unit

The A20B-2101-0025 serves the most capable variant within the FANUC A06B-6134 Beta SVSP series: the triple-axis configuration. Where the dual-axis A06B-6134-H203 covers 2-axis lathes and simple machining centres, the A06B-6134-H303 (H303#A or H303#C) adds a third servo channel — enabling 3-axis machining centre configurations within the same integrated unit format.

The SVSPM1-40/40/40-15i designation breaks down the capability:

• 40/40/40: Three servo axis channels, each rated at 40A peak
• 15i: Integrated 15kW spindle amplifier
• SVSPM1: Single integrated module (as opposed to separate PSM + SVM + SPM)

Compared to the dual-axis A20B-2101-0022, the triple-axis A20B-2101-0025 provides the additional 40A servo channel needed for a third servo motor axis — enabling a compact 3-axis CNC vertical machining centre within one integrated drive unit.

Key Product Information

iSVSP3 vs iSVSP2 — Why the Third Axis Changes the Power Board

The dual-axis unit (A20B-2101-0022 for H203) and the triple-axis unit (A20B-2101-0025 for H303) use different power boards because the physical hardware scales with axis count:

• Three servo output stages require more PCB area for output conductors, connectors, and current sensors
• The DC bus loading from three servo axes plus a spindle is higher than from two axes plus a spindle
• The power board layout must accommodate the additional IGBT devices, their heatsink connections, and their gate drive wiring

These differences make the A20B-2101-0025 physically distinct from A20B-2101-0022 — the boards are not interchangeable.

Application Scenarios

βiSVSP3 power board fault: A 3-axis CNC machining centre with an A06B-6134-H303#A SVSP3 unit develops hardware protection alarms affecting all three servo axes and the spindle simultaneously. The A20B-2101-0025 power board is identified as the fault. Board replacement restores all four channels.

Compact machining centre drive repair: A small CNC vertical machining centre using the triple-axis SVSP3 as its complete drive system requires power board replacement. The A20B-2101-0025 provides the only available board-level repair option for this specific unit.

FAQ

Q1: Is A20B-2101-0025 used in both H303#A and H303#C variants of the A06B-6134?

The A06B-6134-H303 exists in #A (standard interface) and #C (type C interface) variants. The power board A20B-2101-0025 provides the high-current output stage — a function independent of the communication interface type. Whether both variants share the same power board depends on whether any connector or hardware differences exist between them. Confirm from the specific unit's internal documentation.

Q2: What servo motors can be driven by the 40A channels of the A20B-2101-0025?

The 40A peak per channel supports FANUC Beta servo motors rated for up to 40A peak — covering bi22 through bi40 class motors and comparable biS series models. This is significantly higher than the 13A channels of the dual-axis H203 variant, enabling larger servo motors for more demanding 3-axis machining centre axis loads.

Q3: Can A20B-2101-0025 replace A20B-2101-0022 in a dual-axis unit?

No. The triple-axis power board (A20B-2101-0025) has a different physical layout and connector configuration from the dual-axis board (A20B-2101-0022). They serve different module order numbers (H303 vs H203) and cannot be interchanged.

Q4: What are the discharge safety requirements for the A06B-6134-H303 before accessing A20B-2101-0025?

The SVSP3 unit has a larger internal capacitor bank than the dual-axis H203 unit, due to the additional servo channel and higher combined power. Allow the full discharge wait time per the FANUC maintenance manual before accessing internal boards. Verify discharge with a calibrated DC voltmeter in addition to observing any charge indicator LED.

Q5: Does replacing A20B-2101-0025 affect any CNC parameters?

No. All servo and spindle parameters reside in the CNC's main parameter memory. Replacing the power board does not affect stored parameters. After fitting the replacement A20B-2101-0025 and restoring power, the CNC applies the existing parameters to all three servo channels and the spindle automatically.