FANUC A06B-6121-H006#H570 Alpha i Spindle Amplifier Module — SPM-5.5HVi, 400V HV Platform, Type A Interface

Every CNC machining center has two fundamentally different categories of motion: the servo axes that position the workpiece and tool with micron-level precision, and the spindle that actually does the cutting. These roles demand different amplifier architectures. The servo amplifiers in a 400V FANUC system — the A06B-6127 series modules — handle positioning. The A06B-6121-H006#H570 handles the spindle, and the distinction matters from the first connection.

Designated SPM-5.5HVi in FANUC's Alpha i HV spindle family, this module controls a 400V-class alpha spindle motor, managing speed, torque, and orientation across drilling, milling, tapping, and rigid tapping cycles. It is the smallest-rated model in the 6121 HV spindle lineup — and for compact machining centers and small vertical mills running on 400V infrastructure, it's the right fit.

We stock the A06B-6121-H006#H570 in new and used (inspected) condition, ready to dispatch worldwide within 0–3 working days.

Spindle vs. Servo: Why This Module Is Different

All the preceding discussion of servo amplifier modules applies to position-controlled linear and rotary axes — where the drive receives encoder feedback and holds a commanded position. The spindle amplifier operates in a fundamentally different control mode for the majority of its time: speed control, where the command is RPM and the objective is maintaining cutting speed under varying chip load, not holding a fixed position.

There are moments when the spindle does enter position-controlled mode — most notably during rigid tapping, where the CNC coordinates spindle angle with Z-axis feed at a fixed thread pitch. In that mode, the spindle motor's position encoder becomes active and the SPM behaves more like a servo amplifier. But for standard cutting, it's driving a motor at commanded speed against unpredictable mechanical load variations, and the amplifier's job is torque delivery, not positioning precision.

This operational difference means the SPM-5.5HVi has its own alarm system, its own parameter set (spindle parameters, separate from servo parameters in the CNC), and its own diagnostic display. When a spindle fault occurs, it reads on the spindle amplifier's LED display and maps to the spindle alarm codes in the CNC — not the servo alarm table.

The #H570 Suffix: What It Means and Why It Matters

The complete part number is A06B-6121-H006**#H570** — and the suffix after the # sign is not a batch code or minor revision identifier. It specifies the interface type.

Within the 6121 SPM-5.5HVi family, the most common variants are:

• #H550 — Type A interface (earlier version)
• #H570 — Type A interface (current/standard version)
• #H571 — Type B interface

Type A and Type B refer to the control cable connector interface between the spindle amplifier and the CNC's spindle control card. Type A uses the JYA2/JYA3 connector scheme; Type B uses a different configuration. These are physically incompatible — the connectors differ. Ordering the wrong suffix means the unit cannot be connected without rewiring.

When replacing a failed A06B-6121-H006#H570, the replacement must also be #H570 (or a confirmed compatible revision). Do not substitute #H550 or #H571 without verifying with your machine documentation that the cable and CNC configuration is compatible.

Technical Specifications

Where the SPM-5.5HVi Fits in the 6121 Spindle Family

The 6121 series covers the full range of 400V spindle drives used in FANUC's Alpha i HV platform — from the smallest machining center spindles up to large horizontal machining centers with high-power spindles. The power ratings scale as follows: SPM-5.5HVi (H006), SPM-11HVi (H011), SPM-15HVi (H015), SPM-30HVi (H030), SPM-45HVi (H045), SPM-75HVi (H075), and SPM-100HVi (H100).

The H006 at 5.5kW occupies the entry position. It suits vertical machining centers with spindle motors in the smaller alpha i HV spindle range — typically machines with spindle speeds up to 10,000 RPM or higher and a main spindle motor in the 5–7kW continuous rated class. Larger machines with more powerful spindles require higher-rated SPM modules; the 5.5kW module cannot substitute for an 11kW or 15kW application without risking thermal overload on the amplifier under heavy cutting cycles.

Condition Options at a Glance

New units are genuine FANUC stock, unused, warranted for 12 months from our warehouse. For facilities where spindle downtime has a significant production cost, a new unit eliminates any uncertainty about the module's service history.

Used (inspected) units carry a 3-month warranty and represent a practical option where budget is the primary constraint. The spindle amplifier on a machining center typically runs at moderate load during most cutting cycles — a well-maintained used unit is a viable working spare. Both conditions ship in original packaging.

Contact us to confirm current stock status before ordering, as availability on specific condition types fluctuates.

Ordering, Payment & Shipping

Worldwide dispatch via DHL and FedEx, typically within 0 to 3 working days of payment confirmation. Multi-item orders qualify for combined shipping.

Payment options:

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

Import duties and local taxes are the buyer's responsibility. Ask us for a shipping cost estimate if your country isn't shown at checkout.

Warranty & Returns

Returns accepted when units arrive damaged, incomplete, or not as described — or prove non-functional within 4 days of receipt. Original condition and warranty label must be intact. Return shipping is at the buyer's cost.

Failures due to incorrect wiring, incompatible interface type connection, mismatched spindle motor, or physical damage post-delivery fall outside warranty coverage.

Frequently Asked Questions

Q1: What is the practical difference between an SPM (spindle module) and the SVM (servo module) units in the same 6127 or 6121 cabinet?

The SPM drives the machine's cutting spindle, while SVMs drive the positioning axes (X, Y, Z, and any additional servo axes). The spindle's primary job during cutting is maintaining a commanded RPM under varying cutting load — a torque-regulated speed control task. The SVM axes maintain commanded positions — a continuous position-feedback closed-loop task. Both use FSSB communication with the CNC in the 30i/31i generation, but they operate under separate parameter sets, report to separate alarm tables, and have different diagnostic displays. They are not interchangeable. If your machine shows a spindle alarm, the SPM module and its associated motor and feedback cabling are the scope of investigation — not the servo amplifier modules.

Q2: My machine shows spindle alarm SP9030 or similar — does that mean the SPM module has failed?

Not necessarily. Spindle alarms in the FANUC 30i/31i system can originate from the SPM hardware itself, from the spindle motor windings or bearings, from the speed feedback sensor (encoder or magnetic pulse coder on the spindle motor), or from the interface cable between the CNC and the SPM. Before concluding the amplifier has failed, check whether the spindle motor runs freely by hand (bearing condition), whether the speed sensor feedback is intact (check the cable and connector at both ends), and whether the alarm appears at power-up with no motion commanded (which points more toward the amplifier or its communications) versus under load (which can indicate motor or mechanical issues). An IPM fault or overcurrent alarm during cutting is more directly indicative of amplifier hardware failure than a sensor alarm or encoder error.

Q3: Can the A06B-6121-H006#H570 (Type A) be replaced with the A06B-6121-H006#H571 (Type B) if #H570 is unavailable?

Not without a cable change. The #H570 and #H571 suffixes denote Type A and Type B interface variants respectively. Type A uses one connector scheme for the control signal cable between the CNC spindle card and the SPM; Type B uses a physically different arrangement. Swapping between types requires rewiring or replacing the control cable and confirming the CNC's spindle amplifier interface setting matches. This is possible to do, but it is not a direct plug-in replacement. If your original module is a #H570 and downtime pressure is high, sourcing another #H570 is the fastest path back to operation.

Q4: What spindle motors is the SPM-5.5HVi rated to drive?

 The 5.5HVi module is designed for FANUC's alpha i HV series spindle motors operating on the 400V platform. The rated 14A output current at 480V maximum output defines the working envelope for motor compatibility. Specific alpha spindle motors in the smaller HV range — suited to compact machining centers with spindle power ratings in the 5–7kW class — are the intended pairing. The exact motor model compatibility for your machine will have been defined at machine build time, recorded in the spindle parameters (particularly the spindle motor model setting in the CNC). If you have the original machine parameters backed up, the motor type number is recorded there. Matching the replacement SPM to the same motor specification is essential — an SPM rated too low for the spindle motor will overheat under heavy cutting cycles.

Q5: Is it necessary to initialize or re-tune spindle parameters after replacing the SPM module?

The spindle parameters themselves live in the CNC's memory, not in the SPM module, so they are not lost when the amplifier is replaced. However, after fitting a new or replacement SPM, it is good practice to confirm the spindle operates correctly across its speed range and through a rigid tapping cycle before returning the machine to production. In some cases, particularly if the replacement unit has a different hardware revision, minor parameter adjustments may be recommended. The most important step before any hardware swap is to back up the full CNC parameter file — including spindle parameters — so that if the machine requires re-initialization for any reason, all original settings can be restored without relying on memory or incomplete documentation.

Confirm availability or request a quote: Contact Ms. Amy — sales01@sande-elec.com | Skype: sandesales01 | Tel: +86 18620505228