Fanuc PCB Board A16B-2203-0674 A16B22030674 A16B-22O3-O674

A16B-2203-0674 | FANUC Alpha-I SVM2-80/160i Servo Wiring Board — A06B-6114-H210 / Asymmetric 80A+160A Dual-Axis

SVM2-80/160i — Asymmetric Dual-Axis Drive

The FANUC B-65285EN/03 maintenance manual confirms A16B-2203-0674 as the wiring board for the A06B-6114-H210, which carries the SVM2-80/160i designation. This is the asymmetric current variant of the SVM2 twin-axis servo drive family:

The SVM2-80/160i's asymmetric 80A/160A rating makes it the preferred drive for CNC machine tools where two axes have significantly different power demands — for example, a high-load Z-axis (column or ram) paired with a lower-load Y-axis, or a table feed axis paired with a precision positioning axis.

Key Specifications

Wiring Board Role in the SVM2-80/160i

The A16B-2203-0674 wiring board handles the internal signal routing specific to the 80/160i asymmetric architecture. The two axis channels have different transistor module sizes — the 160A channel requires larger IGBT modules than the 80A channel — and the wiring board's PCB layout and conductor sizing reflect these different current levels.

The wiring board connects:

• Gate drive signals from the FSSB control card to two different-capacity IGBT banks
• Current feedback from two differently-rated current sensing circuits
• External FSSB fibre-optic connectors for CNC communication
• Two motor encoder cable connectors (one per axis channel)

Application Scenarios

SVM2-80/160i wiring board fault on asymmetric axis system: A FANUC CNC with an SVM2-80/160i drive develops servo alarms. After verifying the control card and power stage, the A16B-2203-0674 wiring board is identified as the fault. Replacement restores dual-axis servo function.

Servo module /07B revision identification: The confirmed revision /07B is noted on the board's label. When sourcing, confirm the revision from the installed board's label to ensure compatibility with the specific servo module hardware revision.

FAQ

Q1: What distinguishes A16B-2203-0674 (SVM2-80/160i) from A16B-2203-0673 (SVM2-80/80i)?

Both are wiring boards for A06B-6114 series SVM2 twin-axis drives, but for different current capacity variants. A16B-2203-0673 serves the SVM2-80/80i (80A + 80A, equal axes). A16B-2203-0674 serves the SVM2-80/160i (80A + 160A, asymmetric). The boards are not interchangeable — the PCB layout and conductor sizing differ to accommodate the different transistor module sizes on the 160A channel.

Q2: Why would a machine use an asymmetric 80A/160A drive rather than a matched pair?

The SVM2-80/160i is the optimal choice when two axes in the same cabinet position have significantly different power requirements. Using an asymmetric drive correctly sizes the power stage for each axis — avoiding the cost and heat generation of over-specifying the lighter axis with 160A capacity while ensuring the heavier axis has sufficient current headroom.

Q3: Does A16B-2203-0674 work with the same FSSB control card as A16B-2203-0673?

Yes. Both the SVM2-80/80i and SVM2-80/160i use the same FSSB control card family (A16B-2100-074x or A16B-2101-004x). The control card handles the digital servo algorithm and FSSB communication identically for both drive ratings — only the wiring board differs to accommodate the different power stage hardware.

Q4: What safety precautions apply when replacing A16B-2203-0674 inside the servo module?

Switch off and lock out mains power. Verify the SVM2-80/160i DC bus has discharged below 30V using a calibrated DC voltmeter before opening the module. The 200V-class SVM operates with approximately 280V DC bus — this voltage persists after mains removal. Handle the replacement board with an anti-static wrist strap on an ESD-safe surface.

Q5: How do I confirm A16B-2203-0674 is the correct wiring board for my SVM2-80/160i?

The drive module's front nameplate shows the model number A06B-6114-H210 (order spec) or A06B-6114-C210 (unit spec) for the SVM2-80/160i. The FANUC B-65285EN/03 maintenance manual confirms A16B-2203-0674 as the wiring board assignment. Also verify the part number from the label on the installed board itself before ordering the replacement.