PLC Board A20B-2101-0022 A20B21010022 A2OB-21O1-OO22

A20B-2101-0022 | FANUC Beta iSVSP Dual-Axis 15kW Power PCB — A06B-6134 Series / Twin Servo + 15kW Spindle Combo Drive / Wiring Card

Beta iSVSP — Everything in One Box

On small CNC machine tools — compact turning centres, small machining centres, training machines — the FANUC Beta iSVSP (βiSVSP) provides a complete servo and spindle drive in a single unit. It eliminates the need for separate PSM (power supply module), SVM (servo modules), and SPM (spindle module) — the iSVSP integrates all three functions:

Integrated power supply: Rectifies AC mains directly within the unit — no external PSM required. The unit converts incoming AC to the DC bus needed for servo and spindle power.

Servo axis control: Controls the servo motors on the machine's feed axes — typically X and Z on a CNC lathe.

Spindle control: Drives the machine spindle motor — up to 15kW in the A06B-6134-H203 dual-axis variant containing the A20B-2101-0022.

This integration makes the iSVSP ideal for small machine tools where a full Alpha-i cabinet (PSM + SVM + SPM separately) would be physically and economically disproportionate. One unit, one cabinet connection, one set of AC supply cables.

Key Product Information

Power Board — High-Current Heart of the iSVSP

The A20B-2101-0022 is the power PCB (wiring card) inside the βiSVSP unit. It provides:

High-current connection layer: DC bus conductors, three-phase output connections for two servo axes and the spindle, and the current sensing hardware that provides feedback to the control PCB.

IGBT interface: Gate drive connections from the firing/driver board (A20B-2902-0672 in some variants) to the IGBT power devices. The power board physically routes the gate drive signals to the correct IGBT terminals for each axis and the spindle bridge.

Integrated power supply hardware: Rectifier and precharge circuit connections are part of the power board layout — unlike a separate PSM, the iSVSP's power supply hardware is internal to the same unit.

Application Scenarios

Beta iSVSP power board fault: A FANUC A06B-6134 biSVSP unit on a small CNC lathe develops alarms affecting both servo axes and the spindle simultaneously. After the control board is confirmed intact, the A20B-2101-0022 power board is identified as the fault. The complete unit is typically the service approach (as DNC Electronics confirms the individual board is not typically available separately) — but some specialist service centres supply the board independently.

Complete unit refurbishment: A Beta iSVSP unit is refurbished by a specialist CNC service centre. The A20B-2101-0022 power board is replaced alongside the control PCB during the refurbishment to restore both critical internal boards.

FAQ

Q1: What is the difference between A20B-2101-0022 (dual-axis) and A20B-2101-0025 (triple-axis)?

The A20B-2101-0022 is the power board for the dual-axis + 15kW spindle βiSVSP (typically A06B-6134-H203). The A20B-2101-0025 is the power board for the triple-axis + 15kW spindle βiSVSP (A06B-6134-H303). The different axis count requires a different power board layout to accommodate three servo output stages instead of two. These boards are not interchangeable.

Q2: What are the typical alarm indicators on a faulty A20B-2101-0022?

When the A20B-2101-0022 power board develops a fault, the βiSVSP typically displays alarms related to overcurrent, DC bus fault, IPM (intelligent power module) fault, or hardware protection trip. Alarms affecting all three drive functions simultaneously (both servo axes and spindle) — rather than a single-axis fault — are more characteristic of a power board fault than a control board fault, since the power board serves all three simultaneously. Consult the FANUC Beta i Series maintenance manual for specific alarm code definitions.

Q3: What safety precautions are specific to the integrated power supply in the βiSVSP?

The βiSVSP contains an integrated DC bus capacitor bank that retains dangerous voltage after AC mains removal — just as a separate PSM would. Because the power supply is integrated, the capacitor bank is physically within the same unit housing as the power board. The required discharge wait time (specified in the FANUC Beta i Series maintenance manual) must be observed before opening the unit or handling the A20B-2101-0022 internally. The charge indicator LED (if present) and DC bus voltage measurement confirm discharge.

Q4: Is the A20B-2101-0022 compatible with βiSVSP units using the #A and #C interface variants?

The A06B-6134 series includes #A (standard interface) and #C (type C interface) variants. The power board (A20B-2101-0022) provides the high-current electrical connections — which are independent of the CNC communication interface type. Whether the #A and #C variants share the same power board depends on whether any connector or hardware differences exist between the two.