Purchase now the A06B-6096-H203 — Atlantechdrives provides this FANUC Alpha Series SVM2-20/20 Dual-Axis Servo Amplifier Module with FSSB interface, the precision 2-axis servo drive for FANUC CNC systems requiring independent control of two servo axes at 5.9A per channel. Available with express worldwide delivery and 12-month warranty.
What Is the A06B-6096-H203?
The A06B-6096-H203 is a FANUC Alpha Series Servo Amplifier Module (SVM — Servo Module), model designation SVM2-20/20. It is a dual-axis AC servo drive module designed for installation in FANUC CNC controller cabinets as part of the modular Alpha series servo drive system. The SVM2-20/20 model designation indicates a 2-axis module (SVM2) with a rated output current of 20 A peak per axis — in FANUC’s SVM nomenclature, the number after the hyphen represents the peak current rating in amps. The A06B-6096-H203 uses the FSSB (FANUC Serial Servo Bus) optical fiber interface, which is the critical distinction between this module (A06B-6096 series) and the older equivalent SVM2-20/20 (A06B-6079-H203) which uses the Type A/B analog interface. The FSSB interface enables high-speed position feedback communication between the CNC controller CPU and the servo amplifier at microsecond cycle times. The module accepts a 283–325 VDC bus voltage input (supplied by a FANUC Alpha Power Supply Module, PSM series) and provides a nominal 230V AC-equivalent output to the connected servo motors, delivering 5.9A rated continuous current per axis and 2.5kW total power across both axes. The internal PCB assembly of the A06B-6096-H203 consists of a wiring board (A16B-2202-0752) and a control printed circuit board (A20B-2100-0541), as documented in the FANUC Alpha Series Servo Amplifier Descriptions manual (B-65165E).
Key Technical Specifications
- Part Number: A06B-6096-H203
- Model: SVM2-20/20 (2-axis, FSSB interface)
- Series: FANUC Alpha Servo Amplifier Module
- Interface: FSSB (FANUC Serial Servo Bus) — optical fiber
- Number of Axes: 2 (L axis + M axis)
- Rated Input Voltage: 283–325 VDC (from PSM Power Supply Module)
- Total Input Power: 2.5 kW
- Maximum Output Voltage: 230 V AC equivalent
- Rated Output Current (L axis): 5.9 A continuous
- Rated Output Current (M axis): 5.9 A continuous
- Internal PCBs: Wiring board A16B-2202-0752 + Control PCB A20B-2100-0541
- Compatible CNC Controllers: FANUC Series 15i, 16i, 18i, 20i, 21i (A, B, C)
- Older Equivalent (non-FSSB): A06B-6079-H203 (Type A/B interface)
- Manufacturer: FANUC Ltd., Japan
- Status: Available as surplus/replacement part
FSSB Architecture and Alpha SVM System Integration
The A06B-6096-H203 operates as part of FANUC’s modular Alpha servo drive system, which requires three key components: a Power Supply Module (PSM, A06B-6110 or A06B-6130 series) that converts 200–240 VAC three-phase mains into the regulated DC bus voltage, one or more SVM modules (such as the A06B-6096-H203) that convert the DC bus into the AC drive signals for servo motors, and the FANUC CNC controller which sends position commands over the FSSB optical fiber cable to each SVM. The SVM2-20/20 drives two axes simultaneously — typically labelled L (left/lower) and M (middle), with each axis capable of independently driving a FANUC Alpha series servo motor up to the rated 5.9A continuous current. At 5.9A, the SVM2-20/20 is compatible with FANUC Alpha motors rated up to approximately 1kW at 3000 RPM — including the A06B-0114 (αS4/3000), A06B-0116 (αS8/3000), and similar compact Alpha servo motors. The FSSB bus allows daisy-chaining of multiple SVM modules on a single fiber link from the CNC — up to 8 SVM modules can be connected in series on one FSSB channel in Series 16i/18i systems, enabling multi-axis control with a single optical fiber cable pair from the CNC controller to the first amplifier unit. The A06B-6096-H203 is not compatible with newer Alpha i series (A06B-6130 or A06B-6240 series) controllers without modification — always verify FSSB protocol version compatibility before substituting amplifier generations.
Expert Tips
The most common failure mode of the A06B-6096-H203 is the internal control PCB (A20B-2100-0541), which can fail due to electrolytic capacitor ageing on boards manufactured in the late 1990s and early 2000s. If the amplifier exhibits intermittent servo alarms (SV-401 or SV-421 — VRDY off) that clear on power cycle but recur, this is a classic symptom of capacitor degradation on the control board rather than a motor or cabling fault. The control PCB can be replaced individually without replacing the entire amplifier module, significantly reducing repair costs. When replacing the A06B-6096-H203 in a running system, note that the FSSB axis address assignment is stored in the CNC controller parameter (parameter #1023 — servo axis number), not in the amplifier itself — the replacement amplifier will be automatically addressed by the CNC on the next power-up. However, verify after replacement that the axis parameters (#2020 motor type, #2022 rated current, and servo gain parameters) are correct for the motors connected to L and M axes, as incorrect motor type parameters will cause immediate SV alarms or unstable servo behaviour.
Frequently Asked Questions
Q: What is the difference between A06B-6096-H203 and A06B-6079-H203?
A: Both are FANUC SVM2-20/20 dual-axis servo modules with identical electrical specifications (5.9A/axis, 2.5kW, 230V output). The key difference is the controller interface: A06B-6096-H203 uses the FSSB optical fiber interface (required for Series 16i/18i/21i and later CNC generations), while A06B-6079-H203 uses the older Type A/B analog interface (for earlier Series 15A/15B, 16A/16B, 18A/18B controllers). They are not interchangeable without changing the CNC controller’s servo interface board.
Q: Which FANUC motors are compatible with the A06B-6096-H203 SVM2-20/20?
A: The 5.9A per axis rating makes this module suitable for FANUC Alpha series motors up to approximately 1kW at 3000 RPM. Compatible examples include the αS4/3000 (A06B-0114 series, rated ~3.5A), αS8/3000 (A06B-0116 series, rated ~5A), and similar compact Alpha motors. Motors with rated currents exceeding 5.9A require a higher-rated SVM module such as the SVM2-40/40 (A06B-6096-H206) or SVM1-80 (A06B-6096-H105).
Q: Can the A06B-6096-H203 operate without a PSM Power Supply Module?
A: No. The A06B-6096-H203 requires the DC bus voltage (283–325 VDC) provided by a FANUC Alpha PSM (Power Supply Module, A06B-6110 or A06B-6130 series) — it cannot be connected directly to AC mains. The PSM also provides the AC power for the SVM control circuits and the regenerative braking function. The PSM must be sized to supply the total kW demand of all SVM modules connected to the same DC bus.
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