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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A06B-6093-H102 |
The Fanuc A06B-6093-H102 is the SVU-20, a single-axis Beta series servo amplifier unit with PWM Type B interface, delivering 5.9A rated continuous output at 240V from its integrated standalone power supply.
As the next step above the SVU-12 (A06B-6093-H151) in the Beta SVU single-axis lineup, the SVU-20's 5.9A output matches the mid-range Beta series motors — β3/3000 and β6/2000 class — that are commonly used on auxiliary and secondary positioning axes in Fanuc CNC machine tools.
The Type B PWM interface of the H102 is the same serial PWM protocol used by the alpha series A06B-6080 SVM Type B modules, establishing communication between the CNC's Type B axis card and the SVU-20 for position commands and feedback.
This interface places the SVU-20 firmly in the context of machines using Series 0-MD, 0-MF, 16B, 18B, and 21B controls — the B-generation Fanuc CNC controls that introduced the Type B axis interface.
Like all Beta SVU units, the H102 is self-contained: three-phase or single-phase AC mains in, servo motor output out, PWM cable to the CNC.
There is no DC bus connector, no dependence on an external PSM, and no interaction with other amplifier modules on a shared bus.
This architectural independence makes the SVU-20 suitable for installation close to the motor it drives, wherever an AC supply is available, without requiring a run back to a central drive cabinet for DC bus power.
| Parameter | Value |
|---|---|
| Unit Model | SVU-20 |
| Interface | PWM Type B |
| Input (1-phase) | 220–240V AC, 50/60 Hz |
| Input (3-phase) | 200–240V AC, 50/60 Hz |
| Max Output Voltage | 240V AC |
| Rated Output Current | 5.9A |
| Power Supply | Built-in standalone |
| Compatible Controls | FANUC 0-MD/MF, 16B/18B/21B |
The SVU-12's 3.2A output covers the smallest Beta motors; the SVU-20's 5.9A covers the next motor class up.
The decision between the two is entirely determined by the installed motor's rated current: a β3/3000 or β6/2000 motor drawing up to 5.9A continuous requires the SVU-20, while lighter β1 or β2-class motors remain within the SVU-12's capacity.
The 5.9A current class also matches the smaller alpha servo motors — αM2.5/3000, α3/2000, αC6/2000 — which occasionally appear on machines where a Beta SVU handles an axis that would normally use the alpha system.
In these cases, the SVU-20 provides the correct current rating while its simpler standalone architecture eliminates the need for the PSM infrastructure that the equivalent alpha SVM1-20 module would require.
Machine builders selecting drives for auxiliary axes on cost-sensitive machine designs often make exactly this trade-off: Beta SVU for current demands below 5.9A, keeping the machine's alpha drive stack reserved for the primary precision machining axes.
The PWM Type B interface aligns the SVU-20 with Fanuc's B-generation CNC controls.
In machines where the primary axis drives are alpha SVM Type B modules (A06B-6080 series), the SVU-20 connects to the same CNC axis interface card, simplifying the control system architecture.
The Type B PWM protocol handles position command transmission, feedback reception, and servo alarm communication between the CNC and the SVU-20.
Both single-phase and three-phase AC input are supported, providing installation flexibility: machines without three-phase distribution to the drive location can power the SVU-20 from a single-phase branch without requiring a phase converter or transformer.
Q1: Can the A06B-6093-H102 (Type B) directly replace the A06B-6093-H152 (I/O Link) in a machine?
No. The Type B PWM interface and I/O Link interface communicate with the CNC via entirely different protocols and require different CNC hardware configurations.
The H102 (Type B) needs a CNC with a Type B axis card; the H152 (I/O Link) needs a CNC with I/O Link servo capability.
If the machine's CNC is configured for one interface type, substituting the other requires a CNC interface reconfiguration — not just a drive swap.
Q2: What is the single-phase input option used for?
Single-phase input (220–240VAC) allows the SVU-20 to be powered from a standard two-wire plus earth AC circuit where three-phase is not available at the installation point.
This is useful for auxiliary axis installations — a tool magazine drive at the side of the machine, for example — where three-phase distribution cables do not reach the local mounting position.
The input current draw on the single-phase feed is higher than on three-phase (the unit draws the same power but from a single phase), so the single-phase branch circuit must be sized for the single-phase input current accordingly.
Q3: Does the SVU-20 support absolute encoder backup?
Beta SVU units support absolute pulse coder operation when used with Beta series motors equipped with absolute pulse coders.
An absolute encoder backup battery is required; it connects to the SVU-20 at the designated battery connector on the unit's front panel.
When the battery voltage drops below the monitoring threshold, the CNC generates a BAT alarm — the battery should be replaced before it fully discharges to avoid absolute position data loss.
Q4: What are the key commissioning steps after replacing the SVU-20?
After physical installation and wiring:
(1) confirm the interface switch on the unit is set to Type B;
(2) power up the CNC and verify VRDY (servo ready) on the SVU's LED — if VRDY OFF alarm appears, check the PWM cable connection and interface switch setting;
(3) perform a servo parameter initialisation for the axis using the motor type number for the installed Beta motor;
(4) if an absolute pulse coder is used, establish the absolute reference position;
(5) verify axis movement direction and perform a reference return. The CNC's Fanuc servo guide documentation for the specific control series covers each step in detail.
Q5: The SVU-20 is described as a "positioning" drive — can it perform velocity control for continuous axis movement?
Yes. The Beta SVU series performs the same velocity and current loop control functions as the alpha SVM series — it is not restricted to point-to-point moves only.
The distinction between "positioning" and "contouring" in the Beta series context refers to the intended design priority: the Beta series is optimised for cost and simplicity in applications where continuous high-speed multi-axis interpolation is not the dominant duty cycle.
An SVU-20 on a machine can execute continuous feed moves and G-code contouring within its motor's speed and the CNC's command capability — the 5.9A rating determines what motor loads it can sustain during those moves.
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