FANUC A06B-6114-H109 — Alpha i SVM1-360i, The Largest Single-Axis Module in the 6114 Series

Some servo drive replacement jobs are straightforward. Then there's the SVM1-360i.

The A06B-6114-H109 occupies the top of FANUC's 6114 alpha i series: 115A rated output, three internal 400A IGBT transistor modules, a 150mm cabinet footprint, and the designation SVM1-360i — meaning the 360-class current tier in the alpha i single-axis module family. It's built for the highest-demand primary axes on large machining centers: the kind of axes driving oversized rotary tables, heavy pallets, or large-format milling heads where motor current requirements are well beyond what mid-range drives can deliver.

Getting this unit sourced correctly and shipped quickly is what keeps a high-value machine producing parts instead of waiting. Sande Electric stocks the A06B-6114-H109 in new and inspected-used condition, dispatching worldwide within 0–3 working days.

Alpha i SVM: A Different Architecture From Beta SVU

Anyone sourcing FANUC servo drives across multiple product generations will notice a fundamental structural split. The beta SVU family — the 6093 series covered elsewhere in our catalog — are standalone units. Each has its own built-in power supply, converts incoming AC directly, and mounts independently wherever AC power is available. The beta SVU can live on the opposite side of a machine from the rest of the drive stack because it carries its own power.

The A06B-6114-H109 is an entirely different architecture. As an SVM — Servo Module — it does not contain a power supply. It accepts DC bus power from a shared aiPS (Alpha i Power Supply) module, which converts incoming three-phase AC to the DC link voltage that all SVM modules on that bus draw from. One aiPS (or in high-demand installations, two aiPS modules in parallel) feeds the DC bus; individual SVM and spindle modules tap that bus for their output power.

This architecture has two direct consequences. First, the A06B-6114-H109 must be installed in a drive cabinet that includes a compatible aiPS — typically an A06B-6110 or A06B-6111 series power supply module with sufficient continuous power rating for the total load on the bus. Second, an aiPS failure takes every SVM on that bus offline simultaneously, while in the beta SVU system, a standalone unit's power supply failure affects only that axis. Both architectures have legitimate use cases; the SVM bus architecture is chosen where multiple high-power axes are grouped together and where power supply efficiency and centralized regeneration handling outweigh the locational flexibility of standalone units.

Where SVM1-360i Sits in the 6114 Alpha i Module Range

The 6114 series spans a wide range of current classes, all sharing the same FSSB fiber optic interface and the same basic architecture. The single-axis modules step up through progressively larger current tiers:

• SVM1-20i (H101) — 6A rated, 60mm wide, lightest alpha i motors
• SVM1-40i (H102/H103) — 11A rated, 60mm wide
• SVM1-80i (H105) — 19A rated, 60mm wide, one 100A IGBT module
• SVM1-160i (H106) — larger IGBT, mid-high tier
• SVM1-360i (H109) — 115A rated, 150mm wide, three 400A IGBT modules — highest single-axis module in the family

The jump from H106 to H109 is significant. The SVM1-360i is 150mm wide — two and a half times the width of the smallest 60mm modules — and houses three IGBT transistor modules rated at 400A each, arranged in a parallel configuration to deliver the combined 115A continuous output capability. This module is the physical and electrical ceiling of the single-axis alpha i SVM range. It is matched to FANUC's largest alpha i servo motors: motors in the α50i/3000 and αC50 class that appear on the most demanding primary axes of large-format machining equipment.

Technical Specifications

The Three-IGBT Architecture and What It Means for Maintenance

Most alpha i SVM modules in the smaller current classes use a single IGBT transistor module. The SVM1-80i (H105) uses one 100A transistor; the mid-range modules step up through progressively larger single devices. The SVM1-360i is different: three discrete 400A IGBT modules are mounted internally and operate in parallel to deliver the combined output current capacity.

This three-transistor configuration has several implications. An overcurrent fault on the L-axis (alarm code 8 on the front LED) or an IPM alarm on the same axis (alarm code displayed as a number with a dot, e.g., 8.) can originate from any one of the three transistors. A single failing transistor out of three does not necessarily cause an immediate total output failure — it may manifest as intermittent overcurrent trips under high-load conditions before the unit fails completely. Recognizing this pattern early avoids a hard unexpected stop.

The internal cooling fan and the external fan on the heatsink both serve critical functions. At 26kW rated input power, sustained operation at high current loads generates significant heat. The external heatsink fan is the primary thermal management component for the IGBT modules — its failure typically triggers alarm code F (external cooling fan stop) on the front LED before thermal damage occurs. Checking both fans during scheduled maintenance, and having fan assemblies available as consumable spares, is good practice on any machine running an SVM1-360i on a primary high-duty-cycle axis.

Software Variants: #J006 and #N

The A06B-6114-H109 is available in base configuration and at least two documented software variants: #J006 and #N. These suffixes indicate factory software options installed in the control card, typically specifying features such as high-resolution feedback processing, specific HRV algorithm versions, or application-specific parameter sets for particular motor and machine tool pairings.

For a like-for-like replacement on an existing machine, the variant should match the original unit's label where possible. In most cases, substituting the base H109 for a #J006 or #N variant (or vice versa) does not cause immediate hardware faults, but may require parameter adjustments if the CNC had been configured specifically for the variant's feature set.

If the original unit's label is still readable, note the full part number including any suffix before ordering. If the suffix is unknown or the original unit label is damaged, contact us with the CNC model and motor type — we can advise on the most appropriate variant for your application.

Condition Options and Stock

New-old-stock A06B-6114-H109 units are genuine FANUC product in original packaging, never installed. These carry a 12-month warehouse warranty and represent the lowest-risk option for machines in continuous high-production environments. For a 115A drive on a primary machining axis where unplanned downtime is expensive, new stock is worth the premium.

Used inspected units are sourced from decommissioned machines, tested to verify functionality of both axes and FSSB communication, and offered with a 3-month warranty. Contact us to confirm availability on either condition before ordering — stock of high-current alpha i modules moves quickly.

Ordering, Payment & Shipping

Worldwide dispatch via DHL and FedEx within 0–3 working days of confirmed payment. Combined shipping available on multi-item orders.

Payment options:

• Bank Transfer (T/T) — all order values
• PayPal — orders up to $500
• Western Union — all order values

Import duties and local taxes are the buyer's responsibility at destination.

Warranty & Returns

Returns are accepted for units arriving damaged, incomplete, not as described, or confirmed non-functional within 4 days of receipt. Unit must be returned in original condition with warranty label intact; return shipping is the buyer's responsibility. Warranty does not cover damage from incorrect installation, mismatched power supply, or physical damage after delivery.

Frequently Asked Questions

Q1: The A06B-6114-H109 is labeled SVM — does that mean it needs a separate power supply module? What's compatible?

A: Yes. Unlike FANUC beta SVU units which have a built-in power supply, the SVM1-360i is a bus-connected module that takes its main DC power from a shared aiPS (Alpha i Power Supply). The aiPS module rectifies incoming three-phase AC and maintains the DC bus that all SVM and spindle amplifier modules on that bus draw from. For a single SVM1-360i, a compatible aiPS must be present in the same drive cabinet and must have a continuous power rating sufficient to cover the 26kW rated input of this module plus any other modules sharing the same bus. The A06B-6110 and A06B-6111 series are the typical aiPS families used with 6114 SVM modules. If the aiPS is already installed and functioning in your cabinet, replacing just the SVM1-360i is a direct swap on the DC bus connectors.

Q2: What distinguishes the H109 from other single-axis modules in the 6114 range — specifically H106 — and how do I confirm which one my machine uses?

A: The H109 is the SVM1-360i, rated at 115A output with three internal IGBT modules, and is 150mm wide. The H106 is a lower-current single-axis module from the same 6114 family but with a smaller IGBT configuration and narrower cabinet footprint. The simplest confirmation method is the label on the installed unit — the FANUC part number and the SVM designation (SVM1-360i for H109) are printed directly on the module label. If the unit has been removed and the label is damaged, check the machine's electrical cabinet documentation or the CNC parameter screen: FANUC CNC controllers with FSSB can display the connected amplifier model identifiers on the servo maintenance screen. Physically, the 150mm width and the two-fan cooling arrangement (internal fan plus external heatsink fan) are characteristic of the H109 and distinguish it from narrower modules in the same series.

Q3: After installing a replacement H109, the CNC shows servo alarm 8 (L-axis over-current) almost immediately on axis enable. What should be checked first?

A: Alarm 8 on the alpha i module's LED indicates an L-axis overcurrent condition detected by the drive hardware. The first check is motor wiring: inspect the U, V, W power cable from the module to the motor for any short circuit between phases or from phase to ground — a common cause of immediate overcurrent on startup, especially if any work was done near the motor cable during the module replacement. Second, check the motor winding insulation with a 500V megohmmeter between each motor terminal and ground; a reading below 1MΩ suggests motor insulation degradation that will trigger overcurrent in the drive regardless of the drive's condition. Third, confirm that the CNC servo parameters for the axis — particularly the motor code (parameter 2020) — correctly identify the motor type connected to the H109; an incorrect motor code can cause the drive to set current limits that are inappropriate for the actual motor, triggering premature overcurrent detection under normal acceleration loads.

Q4: Can the A06B-6114-H109 drive alpha i motors from the αC series, not just the standard αi motor range?

A: Yes. The αC (alpha core) motor series and the standard αi series both use the same FANUC servo feedback and power interface, and the SVM1-360i is sized appropriately for large αC motors in the 50-class range. The key requirement is that the motor's maximum current demand at the operating load and speed range falls within the 115A continuous output capability of the H109. The motor code parameter in the CNC must be set to the specific αC motor model in use — the CNC uses this to calculate current limits, acceleration profiles, and fault thresholds. FANUC documents the motor code assignments for αC motors in the same parameter manual sections as αi motors; there is no separate parameter set required. If the machine was originally commissioned with a specific αC motor, the parameter set on the original H109 unit (or in the CNC's saved parameters) will already have the correct motor code.

Q5: What do the software variant suffixes #J006 and #N on the A06B-6114-H109 indicate, and does the variant need to match exactly for a replacement?

A: Software variants in FANUC servo amplifier modules typically encode factory-installed options in the control card's firmware: common examples include specific HRV (High Response Vector) algorithm versions, high-resolution encoder interface settings, and application-specific motor support additions. The #J006 suffix typically indicates a specific combination of servo software features enabled for particular machine tool OEM applications. The #N suffix is a standard software variant notation used across multiple FANUC product lines. For a replacement, an exact variant match is the safest approach — it ensures the new unit's firmware behavior is identical to the original without requiring any CNC parameter adjustment. In practice, substituting one variant for another within the same H109 base part number usually functions correctly, because the hardware is identical and the variant differences are primarily in parameter defaults or available features rather than fundamental operational logic. However, if after a non-matching variant substitution the CNC displays a servo initialization warning or the axis behaves unexpectedly on first enable, compare the amplifier software version shown in the CNC's servo maintenance screen against the machine's commissioning record and adjust any affected parameters accordingly. Contact us if you need to confirm variant availability before ordering.

Contact for availability and pricing: Ms. Amy — sales01@sande-elec.com | Skype: sandesales01 | Tel: +86 18620505228