FANUC A06B-6079-H305 Servo Amplifier — Product Description

Three Axes, One Module — Built for Haas CNC Platforms

If you're searching for the A06B-6079-H305, there's a good chance you're maintaining a Haas CNC machine. That's not a coincidence. The A06B-6079 series of servo amplifiers was widely deployed in Haas machining centers and vertical mills that incorporated FANUC-based servo drive systems — and the H305 variant is the three-axis configuration within that family, meaning a single unit controls three brushless servo axes simultaneously.

That three-in-one architecture made these amplifiers an efficient solution for compact machine tool cabinets. It also means that when the H305 develops a fault, up to three axes can go offline at once. For a production shop, that scenario has urgency written all over it.

Product Specifications

The 6079 Series: FANUC's Brushless Servo Architecture

The A06B-6079 line represents FANUC's brushless servo amplifier family — a design that moved away from brushed DC motor architectures toward the AC servo technology that became the standard in CNC machine tools through the late 1980s and into the 1990s. Brushless servo systems offered significant advantages in that transition: reduced maintenance requirements, higher torque density, more consistent performance across varying load conditions, and longer operational life without commutator wear.

Haas Automation, which built many of its early CNC platforms around FANUC drive and control components, integrated the 6079-series amplifiers into a range of its machines during this period. As a result, the A06B-6079-H305 appears frequently in the maintenance history of Haas VF-series machining centers and similar equipment — and continues to be sourced as a replacement part decades after original production.

Why the H305 Specifically?

Within the 6079 family, the suffix encodes the axis count. The "3" in H305 means three axes — typically representing the X, Y, and Z servo axes of a vertical machining center. This three-axis integration into a single amplifier module kept cabinet wiring simpler and reduced the number of discrete drive components in the enclosure.

The practical consequence for today's maintenance teams is this: a machine that originally left the factory with an H305 needs an H305 as a replacement. An H105 (single-axis) or H205 (two-axis) from the same 6079 series cannot substitute. Getting the axis count right is the first checkpoint before placing any order.

Stock Availability: New and Used

Both conditions are held in inventory. New units are uninstalled, original FANUC stock carrying a 12-month warranty — the right call for critical machines where unplanned downtime has real cost implications.

Used units are a legitimate option for facilities working within tighter maintenance budgets, or for machines where the H305 is needed as a backup spare rather than an emergency replacement. Used stock is inspected before listing and carries a 3-month warranty. Given the age of equipment that commonly uses this part number, a tested-functional used unit often represents excellent value.

Please confirm real-time stock availability before ordering, as inventory on legacy Haas/FANUC components can change quickly.

Shipping & Payment Details

Payment options: Bank Transfer (T/T) is available for any order value with no handling surcharge. PayPal is accepted for orders up to USD $500, with a handling fee of approximately 3.9–4.4%. Western Union is also accepted for any order amount.

Dispatch: Orders typically ship within 2–4 business days after payment is confirmed. DHL and FedEx handle the majority of international deliveries. If your destination country has freight restrictions or limited carrier availability, check with us before ordering to confirm options and cost.

All customs duties, import taxes, and clearance fees are the buyer's responsibility. Combined shipping discounts are available for multi-unit purchases.

Warranty & Return Policy — No Surprises

New units: 12-month warranty from date of delivery. Used units: 3-month warranty from date of delivery.

Returns are accepted when goods arrive damaged, incomplete, or not as described — report this on the same day or the following business day after receipt. If a unit proves non-functional within 4 days of delivery under normal operating conditions, a return or replacement will be arranged.

The warranty does not apply to damage caused after delivery, units operated outside rated parameters, or faults resulting from improper installation. Returns for wrong-item purchases or buyer change-of-mind are not accepted. Returned units must include the original warranty label, undamaged and in place.

Equipment Commonly Fitted With the A06B-6079-H305

This three-axis brushless servo amplifier is most frequently found in:

• Haas VF-series vertical machining centers (VF-1, VF-2, VF-3 and similar configurations from the early-to-mid 1990s)
• Haas Mini Mill and HL-series lathe platforms using FANUC-based servo drive systems
• Other OEM CNC machine tools from the same era that integrated FANUC 6079-series components
• CNC training equipment and educational machining centers maintained with original FANUC hardware
• Production cells running legacy Haas equipment where the original drive architecture is preserved rather than retrofitted

Frequently Asked Questions

Q1: Is the FANUC A06B-6079-H305 specifically for Haas CNC machines, or can it be used in other equipment?

The A06B-6079-H305 is most commonly associated with Haas CNC machining centers that used FANUC servo drive components, but it was also integrated into other OEM machine tools from the same period. The defining characteristic is the brushless servo drive interface and the three-axis H305 configuration — if another machine manufacturer specified this same part number in their electrical documentation, the unit is compatible with that application too. The machine brand matters less than confirming the part number matches exactly.

Q2: What does "brushless" mean in the context of this servo amplifier, and does it affect how the replacement is done?

A brushless servo amplifier is designed to drive AC servo motors, which use electronic commutation rather than physical brushes and a commutator. This matters for compatibility: the A06B-6079-H305 is built to work with FANUC's brushless (AC) servo motors from that generation. It cannot be used as a direct substitute for amplifiers designed for brushed DC servo motors, and vice versa. When replacing the H305, the servo motors connected to it should remain the same — you're replacing the drive electronics, not changing the motor architecture.

Q3: My Haas machine is showing a servo alarm across multiple axes — could the A06B-6079-H305 be the cause?

Multi-axis servo alarms appearing simultaneously on a machine that uses an H305 (which controls three axes from a single module) are a meaningful signal. If individual axis faults occur together rather than independently, the shared amplifier module is a logical suspect. That said, the power supply feeding the 6079 module, feedback cables, and motor condition should all be checked before committing to an amplifier replacement. Haas machines from this era typically generate alarm codes that point to the affected axis and fault type — those codes, combined with the physical inspection, will help confirm whether the H305 itself is the root cause.

Q4: Are there any important differences between H305 units from different production dates or revision levels?

FANUC periodically released minor revisions to amplifier boards within a given series, sometimes updating component specifications or PCB layout without changing the part number. In most cases, these revisions are transparent to the end user — the unit installs and operates identically. If your machine has very specific known-issue history or you're replacing a unit that failed in an unusual way, noting the board revision number on the original unit (visible on the PCB label) and checking whether it matches the replacement stock can be worthwhile. For most standard replacements, however, the part number match is sufficient.

Q5: Can I order multiple units at a discount, and is there an option for expedited shipping if my machine is down?

Combined shipping discounts are available for multiple units ordered together — the shipping cost is consolidated rather than charged per unit. For urgent requirements where a machine is actively down and production is affected, contact us directly at the time of inquiry. Priority handling arrangements can often be made to move dispatch ahead of the standard 2–4 business day window, depending on current stock status and freight options to your location.

Contact: Ms. Amy | Email: sales01@sande-elec.com | Tel: +86 18620505228