A06B-0239-B200#0100 New A06B0239B200#0100 Fanuc AC Servo Motor
PRODUCT DETAILS
Part Number: A06B-0239-B200#0100 | Alt. Reference: A06B0239B200#0100 | Brand: Fanuc | Series: αiS (Alpha-i S) | Condition: New In Box
Decoding the Part Number — No Guesswork
Every digit in a Fanuc servo motor part number carries specific meaning. Here is exactly what A06B-0239-B200#0100 tells you:
| Segment | Meaning |
|---|---|
| A06B | Fanuc AC servo motor product family |
| 0239 | Motor model: αiS 12/4000 (frame size and torque/speed class) |
| B200 | B = standard winding; 200 = 200 V AC power supply series |
| #0100 | Option suffix: IP67 sealed (full dust and water immersion protection), straight shaft with keyway |
The αiS 12/4000 designation means: 12 Nm peak torque, 4000 RPM maximum speed — this is a medium-frame, high-speed servo motor from Fanuc's flagship αi series, designed for demanding CNC axis and spindle-adjacent applications.
At a Glance — Key Specifications
| Parameter | Value |
|---|---|
| Part Number | A06B-0239-B200#0100 |
| Series | Fanuc αiS (Alpha-i S) |
| Model Designation | αiS 12/4000 |
| Rated Power | 4 kW |
| Rated Speed | 3,000 RPM |
| Maximum Speed | 4,000 RPM |
| Rated Torque (continuous) | 12.0 Nm |
| Peak Torque (instantaneous) | 38.0 Nm (approx., 3× rated) |
| Rated Current | 20.5 A |
| Supply Voltage | 200 V AC (3-phase, via servo amplifier) |
| Encoder Type | αi Pulsecoder (absolute, built-in) |
| Encoder Resolution | 1,000,000 pulses/rev (1 × 10⁶ p/r) |
| Shaft Configuration | Straight shaft with keyway, 24 mm diameter |
| Brake | None (B200 = no brake); see B205 for brake version |
| Ingress Protection | IP67 (#0100 suffix — fully sealed) |
| Weight | Approx. 12.1 kg |
| Mounting | Flange mount (IEC standard flange) |
| Compatible Amplifiers | Fanuc αiSV series (A06B-6117, A06B-6140 etc.) |
| Condition | New in OEM box |
What IP67 Actually Means for This Motor
The #0100 suffix is not cosmetic — it is the engineering designation for the fully sealed variant of the αiS 12/4000. IP67 means the motor enclosure has been tested to:
- 6 — Complete protection against solid particles and dust ingress (dust-tight)
- 7 — Protection against temporary immersion in water up to 1 metre depth for 30 minutes
In practical CNC terms, this means the motor can operate in direct contact with coolant spray, cutting fluid mist, chip wash-down environments, and humid or wet machine tool interiors. This is the version specified for machining centre axes where coolant is used heavily, and for wash-down stations where motors may be exposed to high-pressure cleaning.
The standard (non-#0100) version provides IP65 protection, adequate for general industrial environments. If your application involves direct coolant exposure, the #0100 is the correct specification.
Comparison at a glance:
Suffix Protection Typical Use Standard (no suffix) IP65 General industrial, coolant-adjacent #0100 IP67 Direct coolant exposure, wash-down #0101 IP67 + oil seal High-pressure coolant / submerged applications
The αiS Series — Where It Fits in Fanuc's Motor Range
Fanuc's servo motor lineup spans several series, each optimised for different performance requirements:
| Series | Character | Torque Range | Typical Application |
|---|---|---|---|
| βiS | Compact, cost-effective | 0.5–4 Nm | Small CNC axes, peripheral drives |
| αiS (this motor) | High power density, high speed | 2–200 Nm | Main CNC axes, machining centres |
| αiF | High inertia, heavy cutting | 10–3,000 Nm | Heavy-duty turning, large machining |
| αiI | Ultra-high speed spindle | — | Spindle motor applications |
The αiS 12/4000 (A06B-0239) sits at the upper-middle of the αiS range — powerful enough for demanding X, Y, and Z axes on mid-to-large machining centres, yet fast enough (4,000 RPM max) for responsive dynamic profiles in high-speed machining applications.
Compatible Fanuc Servo Amplifiers
The A06B-0239-B200#0100 is designed to operate with Fanuc αiSV series servo amplifiers. The amplifier must be correctly sized for the motor's rated and peak current. Common compatible amplifiers include:
| Amplifier Model | Current Rating | Notes |
|---|---|---|
| A06B-6117-H205 (αiSV 20/20) | 20 A / 20 A | Dual-axis, suitable for this motor on one axis |
| A06B-6117-H103 (αiSV 40) | 40 A | Single-axis, comfortable derating margin |
| A06B-6140-H015 (αiSV 20HV) | 20 A | HV series for 400 V supply systems |
| A06B-6096 SVM series | Various | Older SVM series with compatible ratings |
Always verify the amplifier's rated output current against the motor's 20.5 A rated current and confirm compatibility using Fanuc's motor-amplifier combination table in the αi Series Servo Motor Descriptions (B-65262EN) before commissioning.
Typical Application Scenarios
High-Speed Vertical Machining Centres (VMC) The αiS 12/4000's combination of 4,000 RPM maximum speed and 12 Nm continuous torque makes it well-suited for X, Y, and Z axes on medium-frame VMCs running aluminium and steel machining cycles. The IP67 protection is particularly valuable on the Z-axis where coolant drainage onto the motor is common.
Horizontal Machining Centres (HMC) HMC pallet-shuttle and B-axis (rotary table) drives frequently use αiS-series motors where a combination of torque density and speed is required. The absolute encoder eliminates the need for axis referencing after power-on, reducing cycle start time.
CNC Turning Centres — C-Axis and Sub-Spindle The C-axis of CNC lathes (live tooling orientation) and sub-spindle servo axes are typical αiS applications requiring controlled torque at moderate speeds.
Direct Replacement on Existing Fanuc Installations The most common reason engineers search for this exact part number is to replace a failed motor on a production machine. A new A06B-0239-B200#0100 installs directly in place of the failed unit. With an absolute encoder, the machine typically resumes production after a simple zero-return procedure — in many cases without any parameter changes if the replacement motor is the same revision.
What the Absolute Encoder Means for Your Operation
The built-in αi Pulsecoder absolute encoder at 1,000,000 pulses/revolution provides two key operational advantages over incremental encoder motors:
No homing cycle required after power-on. Absolute encoder motors retain position information through power cycles (backed by a small lithium battery in the CNC control unit). When the machine powers on, the CNC immediately knows every axis position without running a reference return cycle. This reduces cycle start time, eliminates homing-related collisions, and simplifies recovery after E-stop events.
High position resolution. One million counts per revolution on a 24 mm shaft translates to sub-micron linear resolution at typical ballscrew pitches (5–10 mm/rev), enabling the tight contour accuracy and surface finish quality that αi-series CNCs are specified for.
Before You Order — Verification Checklist
For a $1,484 servo motor going into a production machine, a few minutes of verification saves significant cost and downtime:
- ✅ Confirm the motor part number on the nameplate of the failed unit matches A06B-0239-B200#0100 (including the #0100 suffix)
- ✅ Confirm your servo amplifier's rated output current is ≥ 20.5 A for this motor
- ✅ Confirm the shaft configuration (straight + keyway) matches your coupling or pulley
- ✅ Confirm the power supply is 200 V AC series (not 400 V HV series — those use different motor variants)
- ✅ For IP67 machines: confirm the motor connector and cable entry seals are intact and correctly assembled after installation
If you are unsure about compatibility, contact us with your machine model, CNC control model, and amplifier part number — we can advise before you order.
Ordering & Delivery
- ✅ New in OEM box — genuine Fanuc motor, never installed
- ✅ In Stock — dispatches within 1–3 working days
- ✅ Global Shipping — DHL / FedEx / UPS express available for production-down situations
- ✅ Secure export packaging — motors shipped in reinforced crating to prevent transit damage
- ✅ 15+ years Fanuc servo motor supply experience
- ✅ Pre-order technical support — compatibility checks available on request
Frequently Asked Questions
Q1: What does A06B-0239-B200#0100 mean — can you decode the full part number? Yes. A06B identifies this as a Fanuc AC servo motor. 0239 is the product code for the αiS 12/4000 model — a motor with 12 Nm continuous torque and 4,000 RPM maximum speed. B200 specifies the standard B-series winding for 200 V AC supply systems. The #0100 suffix is the option code for IP67 full sealing with a straight keyway shaft. Together, this is: a Fanuc αiS 12/4000 servo motor, 4 kW, absolute encoder, IP67 sealed, 200 V AC, straight shaft with keyway.
Q2: What is the difference between A06B-0239-B200#0100 and A06B-0239-B200 (without the suffix)? The #0100 suffix indicates the IP67 sealed version with straight shaft and keyway. The base version without this suffix provides IP65 protection — sufficient for general industrial environments but not for direct coolant immersion. If your machine has the motor mounted in a coolant-exposed location (typical for machining centre axes), the #0100 specification is correct. Fitting a non-IP67 motor in a position designed for IP67 will result in coolant ingress and premature motor failure.
Q3: Does this motor have a brake? No. The B200 model code indicates no holding brake. If your application requires a fail-safe electromagnetic holding brake — for example, a vertical Z-axis that must hold position under gravity when the servo is de-energised — the correct variant is A06B-0239-B205#0100 (same motor with 24 V DC electromagnetic brake). Confirm whether your machine's original motor included a brake before ordering.
Q4: Which Fanuc CNC systems and servo amplifiers is this motor compatible with? The A06B-0239-B200#0100 is compatible with Fanuc's αi-series servo amplifiers (A06B-6117 αiSV series, A06B-6140 αiSV HV series for 400 V systems, and A06B-6096 SVM series). It is designed for use with Fanuc CNC controls including Series 0i-MD/TD, Series 16i/18i/21i, Series 30i/31i/32i, and their variants. The motor is not compatible with βi-series amplifiers or older Series 0/10/11/12 analogue servo systems. Always verify amplifier current rating against the motor's 20.5 A rated current.
Q5: The motor has an absolute encoder. Does this mean no homing cycle is needed? Correct. The αi Pulsecoder absolute encoder retains absolute position data through power cycles, backed by a lithium battery in the CNC control unit (typically the CNC cabinet, not the motor itself). When the machine powers on, each axis position is immediately known. However, after a battery replacement or encoder alarm, or after physically moving the axis while the machine was powered off and the battery was disconnected, a one-time reference return (zero return) is required to re-establish the absolute position datum.
Q6: The encoder battery — where is it located and when does it need replacing? The position backup battery for αi Pulsecoder absolute encoders is located in the CNC control cabinet, not in the motor. It is a 6 V lithium battery (Fanuc A98L-0031-0028 or equivalent) that maintains the position memory when the machine is powered off. Fanuc typically recommends replacement every 1–2 years or when a low battery alarm (APC alarm) is displayed. Replacing the motor does not require battery replacement unless the existing battery is already at end of life.
Q7: How heavy is this motor, and what are the mounting dimensions? The A06B-0239-B200#0100 weighs approximately 12.1 kg (26.7 lb). It uses a standard IEC flange mounting with a 24 mm straight keyed shaft. Exact flange dimensions (bolt circle diameter, pilot diameter, overall length) are available in Fanuc's αi Series Servo Motor Descriptions manual (B-65262EN), which is the authoritative source for mechanical dimensions. We recommend downloading this document from Fanuc's website before designing your mounting arrangement.
Q8: Can this motor be used as a direct drop-in replacement on my machine? In most cases, yes — provided the part number on the failed motor's nameplate exactly matches A06B-0239-B200#0100 (including the #0100 suffix). The replacement motor should be connected to the same amplifier with the same power and feedback cables. After installation, a one-time zero-return procedure is typically required to re-establish the absolute position reference. No parameter changes should be necessary if the replacement is the same model. If the failed motor was a different revision or model, parameter verification is recommended.
Q9: Is this motor new or refurbished? This is a 100% new, genuine Fanuc motor in original OEM packaging. It has never been installed in a machine, never been powered from a servo amplifier, and has not been refurbished or rewound. The encoder, windings, seals, and shaft are all in as-manufactured condition.
Q10: Do you offer express shipping for production-down emergencies? Yes. We understand that a failed servo motor on a CNC machine means production is stopped. Express international shipping via DHL or FedEx is available with delivery in 2–5 working days to most destinations. Contact us directly with your location and required delivery date and we will arrange the fastest available shipping option.