FANUC A06B-6164-H311 — βiSVSP 20/20/40-7.5 Combined Servo & Spindle Amplifier | Entry-Class 3-Axis + 7.5kW, 200V

Part No.: A06B-6164-H311 (#H580) ▏Family: βi Servo/Spindle Integrated Unit ▏Model Code: biSVSP 20/20/40-7.5 ▏Interface: FSSB Fibre-Optic ▏Voltage Class: 200V AC Input ▏Weight: approx. 12 kg

Built for Compact Machines, Not Cut-Down Performance

There is a category of CNC machine tool — the small vertical machining centre, the compact turning cell, the automated drilling station — where total cabinet volume is constrained, spindle demands are modest, and the axes run relatively light servo motors. These machines do not need a 15kW spindle amplifier or 40A continuous servo channels. What they need is a reliable, well-integrated unit that fits the application without over-engineering the cabinet.

The A06B-6164-H311 fills that role precisely. As the entry-tier three-axis model in FANUC's βiSVSP (Beta i Servo/Spindle) combined amplifier family, it delivers three independent servo channels alongside a 7.5kW spindle amplifier — all from a single module. The unit connects to the CNC via FSSB fibre-optic bus and operates from a 200V three-phase mains supply, making it a natural fit for 0i-D and 0i-Mate-D based machine tools running FANUC's compact β-series motors.

What sets the biSVSP format apart from conventional drive topologies is the elimination of a standalone spindle drive. Instead of wiring a separate spindle amplifier beside a multi-axis servo module, this single chassis handles all drive functions — servo position loops on three axes and spindle speed/torque control — through one power connection and one fibre-optic communication path to the CNC. The resulting cabinet design is simpler, lighter, and easier to service.

Specifications

Where the H311 Sits in the 6164 Family

The A06B-6164 series spans multiple power classes, all sharing the same three-servo-plus-spindle combined architecture and the same FSSB communication interface. The H311 is the lowest-spindle-output option in the three-axis lineup:

The H311 and H312 share identical servo channel ratings — 20A peak on L and M, 40A peak on N — differing only in spindle power class. If your machine's spindle motor nameplate is at or below 7.5kW, the H311 is the correct selection. Stepping up to the H312 adds cost and input draw without benefit to a 7.5kW spindle installation.

Motor Compatibility

Servo Axes

The asymmetric servo sizing of 20/20/40 follows the same logic as across the 6164-H31x sub-series. L and M axes handle the lower-demand horizontal travel (typically X and Y), while the N channel's higher 40A peak accommodates the Z-axis, where spindle head weight and gravity compensation impose a greater continuous current draw.

Compatible FANUC βiS-series servo motors for each channel class:

L and M axes (20A peak): βiS 4/5000, βiS 8/3000, βiS 8/2000 — all within 20A peak envelope for typical duty cycles

N axis (40A peak): βiS 12/3000 — upper range of N-channel continuous current capacity at 13A rated

Servo motors from the βiS 22 frame and larger are not suitable for any channel of this unit, as their continuous current demand exceeds the per-channel ratings.

Spindle Motor

The 7.5kW spindle section pairs with FANUC's βi-series spindle motors at or below the 7.5kW continuous power class. Representative compatible models include:

• βiI 8/6000 — in-line integral spindle motor, within amplifier output envelope
• βiI 3/10000 — higher-speed, lower-torque variant for small-diameter tooling applications

Always verify the motor's continuous current draw against the amplifier's spindle output specification before specifying a replacement. The 7.5kW rating represents the spindle channel's continuous thermal limit, not a hard cutoff on peak current during acceleration.

Key Technical Features

HRV2 / HRV3 Current Loop Control The H311 supports both High Response Vector 2 and HRV3 current control modes. HRV3, when enabled and supported by the CNC, operates at a higher current loop update rate — reducing servo following error during high-acceleration moves and improving surface finish quality in contour milling operations. Whether HRV2 or HRV3 is active depends on the CNC parameter configuration and the servo motor type installed.

Built-in Regeneration The unit incorporates an internal regeneration circuit that returns braking energy to the AC supply during motor deceleration rather than dissipating it as heat through an external resistor. On compact machines with frequent axis reversals — short-stroke drilling cycles, for example — this regeneration capability reduces thermal load in the cabinet and contributes to lower energy consumption over a full production shift.

IPM Alarm Monitoring The output stage uses Intelligent Power Module (IPM) technology, which monitors junction temperature internally and triggers protection before a thermal runaway event can cause irreversible PCB damage. IPM alarms appear as specific servo alarm codes on the CNC screen, allowing a technician to distinguish a genuine device overheat from an external cause such as blocked airflow or a failed cooling fan.

Part Number Cross-Reference

Shipping & Logistics

Lead time: Stocked units are confirmed and ready to dispatch within 1–2 business days.

Packaging: Anti-static bag inside foam-padded rigid carton. Units weighing over threshold ship in custom timber crates for added protection in transit.

Carriers: DHL Express · FedEx International Priority · UPS Worldwide Express · TNT · EMS — assigned based on destination and urgency requirements.

Delivery time: Express services reach 220+ countries within 24–48 hours. Standard international transit is 3–7 business days depending on destination.

Import duties: Buyer's responsibility per destination country customs regulations. Commercial invoice and full packing list included with every shipment.

FAQ

Q1: What is the spindle power limit of the A06B-6164-H311, and what happens if it's exceeded? The spindle channel is rated at 7.5kW continuous output. Running a spindle motor whose nameplate continuous power demand exceeds this figure will drive the amplifier's output stage beyond its thermal design limits during sustained cuts, eventually triggering an overheat alarm or, if protection fails to trip in time, damaging the IGBT output modules. Momentary spindle overload during acceleration is tolerable within the module's short-term peak current margin, but sustained overload will shorten service life significantly. For machines with spindle motors rated above 7.5kW, the A06B-6164-H312 (11kW spindle section) is the appropriate step up.

Q2: Can the A06B-6164-H311 replace an older A06B-6134 series unit on the same machine? Direct mechanical substitution is possible if the cabinet has the correct slot dimensions, but the 6164 series uses FSSB fibre-optic communication while the earlier 6134 series used a different interface protocol. A CNC running a 0i-C or older control (which uses the 6134 series) cannot communicate with the 6164 series amplifier without a CNC upgrade. The 6164 series is only compatible with 0i-D, 0i-MD, and 0i-Mate-D generation controls. If your machine is already running one of those controls with a failed 6134 unit, it is worth investigating with a FANUC integrator whether the 6164 can be adopted — the answer depends on specific firmware versions and parameter compatibility.

Q3: My machine displays an SV401 alarm on the N-axis specifically. Does this point to a fault in the N-channel of this unit? SV401 is a FANUC ready signal off alarm — it indicates the servo amplifier is not responding to the CNC's ready command on that axis, which can stem from several causes independent of the output channel itself. Before suspecting the IGBT stage on the N-channel, check the 24V DC control power supply to the amplifier (loss of 24V disables all or selected axes), confirm the servo enable signal from the PMC is active, and verify there is no emergency stop condition being held by the machine's safety circuit. If all these check out, then the fault is more likely within the N-axis output stage or its associated motor feedback path.

Q4: Does this unit support rigid tapping on the spindle axis? Yes, rigid tapping is supported when the CNC option is enabled and the spindle motor is fitted with a position coder (or a compatible encoder feedback arrangement). The spindle channel on the βiSVSP units handles the transition from speed control to synchronised position control needed for rigid tapping, provided the CNC has the spindle synchronisation software option active. The hardware capability is present in the amplifier; the limiting factor is whether the purchased CNC option set includes rigid tapping.

Q5: Which cooling fan replacement should be stocked for the A06B-6164-H311? The forced-air cooling fan is the highest-wear component in any βiSVSP module and should be part of every preventive maintenance stock plan. The specific fan part number is printed on the label of the installed fan inside the unit — it varies between hardware revisions, so the best practice is to photograph the fan label at next access and order the correct replacement before it fails rather than after. Fan failure will quickly trigger an IPM overheat alarm as airflow drops below the threshold needed to maintain output stage junction temperatures within specification.