A06B-6220-H026#H600 Fanuc Servo Amplifier Module A06B6220H026#H600 A06B-6220-H026#H600

Fanuc A06B-6220-H026#H600 | αi-B Spindle Amplifier Module — AiSP-26, 283–339V / 105A Input, 128A / 240V Output, αi Series CNC Spindle Drive

Overview

The Fanuc A06B-6220-H026#H600 is the AiSP-26 spindle amplifier module within Fanuc's A06B-6220 αi-B spindle series, delivering 128A rated output from a 283–339V DC bus at 105A input.

As part of the αi-B product generation, it represents a significant evolution from the earlier alpha series SPM modules: thinner physical profile, improved thermal management, and compatibility with Fanuc's αi-series CNC controls that anchor modern high-performance machining centre installations.

The "26" in the AiSP-26 designation refers to the spindle motor power class this module is designed for — the 26kW-class αi spindle motors used on large machining centres, high-speed machining systems, and heavy turning centres where spindle power at maximum material removal rate requires sustained 26kW output from the spindle drive.

At 128A rated output, the AiSP-26 has the current capacity to sustain the motor's full continuous torque at its rated power point, with headroom for the short-duration peak currents during spindle acceleration.

The #H600 suffix identifies this as the standard 200V input series variant of the AiSP-26.

Fanuc's αi-B series is available in both 200V and 400V input variants — the #H600 designation places this module in the 200V (283–339V DC bus) category, appropriate for machines connected to standard three-phase 200–240V AC infrastructure without the step-up transformer that 400V spindle drives would require on standard voltage sites.

Key Specifications

αi-B Series Architecture — Next Generation Spindle Control

The αi-B series represents Fanuc's current-generation integrated servo and spindle amplifier platform. Compared to the older alpha series (A06B-6078/6088/6102), the αi-B employs a thinner modular structure that reduces cabinet rail space per module and uses a shared DC bus drawn from the αi-series PSM (A06B-6220 power supply modules).

The reduced physical depth of the αi-B modules allows tighter cabinet packing when multiple amplifier modules are installed side by side.

The spindle control algorithm in the αi-B platform incorporates HRV (High Response Vector) control advances refined over multiple generations.

For the AiSP-26 driving a 26kW-class αi spindle motor, this translates to fast torque response during spindle load transients — when the cutting tool engages a hard material zone or when the spindle must rapidly adjust speed to maintain constant surface speed — and accurate torque regulation that determines the consistency of the machined surface finish.

The αi-B series' improved diagnostic architecture means more granular alarm codes and faster alarm response compared to the older generation, reducing the time between a fault event and its identification by the CNC operator.

The module displays alarm states on its LED indicators, while the CNC's alarm display provides the full alarm code and description.

Spindle Functions — Cs Contouring, Rigid Tapping, Synchronisation

The AiSP-26's Type B interface (standard for αi-B modules) enables the full suite of advanced spindle functions that modern CNC machining centres and turning centres depend on. Cs contouring control uses the spindle as a rotary position axis — on a turning centre, this enables milling, drilling, and threading operations on the workpiece face and circumference without a separate indexing mechanism.

Rigid tapping synchronises spindle angular position with Z-axis linear advance through each thread pitch, eliminating the floating chuck and enabling high-speed tapping with thread quality that floating systems cannot match.

Spindle synchronisation coordinates two spindles on a twin-spindle lathe, matching their angular velocities and positions during workpiece hand-off from main to sub-spindle.

At 128A output capacity, the AiSP-26 sustains these servo-mode spindle operations — which demand higher current control bandwidth than simple speed regulation — without the current headroom issues that arise when undersized spindle drives are used for Cs contouring at low speeds.

FAQ

Q1: What αi spindle motors are matched to the AiSP-26 current rating?

The 128A rated output corresponds to αi series spindle motors in the 22–26kW continuous power range, specifically the αi22/12000 and αi26 class motors used on large machining centres and turning centres.

The specific motor model determines the parameter configuration loaded into the module — the rated current, speed sensor type, and control coefficients are all motor-specific parameters that must be correctly set before the spindle can operate.

Q2: What distinguishes the #H600 suffix from other suffix variants?

The #H600 suffix identifies the standard 200V input series module, designed for DC bus voltages in the 283–339V range generated by the standard 200V-series αi PSM. Other suffix variants such as #H580 identify the 400V high-voltage series (operating from 565–679V DC bus).

The two series are not interchangeable — the power conversion stages, transistor voltage ratings, and motor output voltage differ between 200V and 400V input modules. Always verify the machine's PSM and power infrastructure type before ordering a spindle module replacement.

Q3: The αi-B series uses a "thinner profile" — how does this compare physically to the older A06B-6088 alpha spindle modules?

The αi-B spindle modules are significantly slimmer in depth than the A06B-6088 first-generation alpha SPM modules, enabling more modules per unit of cabinet rail length.

The αi-B also uses a different bus connection system and connector standard from the older alpha series — the two series are not physically interchangeable in the same drive rail. 

A machine upgrading from alpha to αi-B requires replacing the PSM and potentially the drive rail mounting hardware, in addition to the spindle and servo modules.

Q4: What CNC controls are compatible with the A06B-6220-H026#H600?

The αi-B series spindle modules communicate via the αi-series spindle serial interface, compatible with FANUC 30i/300is/300i, 31i/310is/310i (A5 and standard), and 32i/320is/320i control series, as well as the earlier 15i, 16i, 18i, and 21i controls fitted with αi-series drive configurations.

The specific firmware revision and CNC software option set determine the full range of spindle functions available — confirm the target CNC's spindle interface specification against the αi-B series spindle amplifier documentation before installation.

Q5: What are the most likely fault causes for the AiSP-26 in production service?

Spindle motor insulation breakdown causing through-fault current to the output stage is the most common sudden fault scenario — always test motor winding insulation to protective earth (acceptable: several hundred megaohms or higher) before concluding the module has failed.

Cooling fan failure leading to thermal overload is the most common maintenance-related fault; both the internal electronics fan and any external heatsink fan must be verified as operational during routine checks.

Control board component aging over years of service can produce intermittent Cs-axis or rigid tapping errors that do not appear as hard alarms — these intermittent faults typically require repair rather than parameter adjustment.