FANUC A06B-0162-B575#0076 — Alpha Series αM6/3000 AC Servo Motor, IP67 Sealed, Straight Shaft with Keyway, αA64 Absolute Pulsecoder

At a Glance

Part Number: A06B-0162-B575#0076 (also referenced as A06B0162B575#0076 or A06B-0162-B575#7076) Motor Model: FANUC αM6/3000 Key Configuration: Straight shaft, keyway, no brake, αA64 absolute pulsecoder, IP67 full sealing

The FANUC A06B-0162-B575#0076 is a sealed AC servo motor from FANUC's Alpha (α) series, model αM6/3000, delivering 1.4 kW continuous output with 6 Nm rated torque at up to 3,000 rpm. What separates this variant from the rest of the A06B-0162-B575 family is the IP67 waterproof specification — a factory-fitted enhanced sealing package that brings the motor body and pulsecoder connectors to full immersion-protection standard. Combined with a straight keyed output shaft and an αA64 absolute encoder, this is the configuration of choice for feed-axis applications on CNC machine tools where the motor is exposed to coolant splash, oil mist, or wash-down conditions that exceed the capabilities of a standard IP65 motor.

Verified Specifications

Why IP67 Matters: Beyond Standard IP65

The baseline protection level across the FANUC Alpha series motor range is IP65 — fully dust-tight and protected against low-pressure water jets from any direction. For the majority of CNC machine installations, IP65 is sufficient. But certain machine configurations generate more aggressive liquid exposure: horizontal machining centres where coolant is directed across the pallet and runs down the column; CNC lathes with through-spindle coolant and flood delivery systems that mist the entire work envelope; machines that use aqueous synthetic cutting fluids rather than mineral oils, which behave differently from conventional coolant and penetrate standard seals more readily.

For these environments, FANUC offers the IP67 option on most Alpha series motors. IP67 raises the protection to withstand temporary immersion — the IEC standard defines this as submersion to 1 metre depth for 30 minutes without harmful water ingress. In practical terms, this means the motor body can survive brief flooding, complete splash immersion from all directions, and the accumulation of pooled liquid around the motor mounting without the coolant reaching the stator windings or the pulsecoder interior.

The A06B-0162-B575#0076 is ordered from FANUC with the IP67 specification factory-applied. This is not a field retrofit. The sealing elements — the shaft oil seal, body gaskets, connector seals, and the waterproof pulsecoder connector — are all integrated at manufacture. A standard IP65 motor cannot be upgraded to IP67 in the field; if the application requires IP67, this part number (or the equivalent #7076 suffix designation) must be specified at the time of order or replacement.

The #0076 Suffix Decoded in Practice

Within the FANUC Alpha motor suffix numbering system, the two digits following the # character carry specific meaning. The "0076" suffix on B575 (straight shaft, αA64, no brake) encodes two characteristics:

• The "76" indicates a straight shaft with keyway and IP67 sealing
• Compare with "75" (straight shaft, IP67, no keyway) and "08" (straight shaft, keyway, standard IP65)

In FANUC parts catalogues and distributor databases, the same motor is sometimes listed under the suffix #7076 — the "7" prefix in that alternative notation also signals the IP67 classification. Both A06B-0162-B575#0076 and A06B-0162-B575#7076 refer to the same physical motor. When cross-referencing Fanuc MLFB suffix tables, both notations will be encountered depending on the source document version; always confirm by checking the full motor description against the nameplate on the machine.

Straight Shaft with Keyway: Why the #0076 Over the #0075

The sibling variant #0075 (SEALED AM6/3000, ST, αA64) shares the same IP67 body sealing but has a plain straight shaft — no keyway machined into the output shaft. The choice between #0075 and #0076 comes down entirely to the mechanical coupling method on the machine.

Use #0076 (keyed) when the motor output shaft engages a component with a bored keyway — a timing pulley, gear, or coupling hub that relies on a parallel key to transmit torque. The key locks the rotating element axially to the shaft, preventing rotation under torsional load. This is the conventional approach for belt-drive connections from the motor to a ballscrew, and for many direct-coupled designs using split-clamp couplings with keyway bores.

Use #0075 (plain) when the shaft is smooth-bored and grips by friction alone — common with high-quality rigid zero-backlash couplings that transmit torque entirely through clamping force, where a keyway would introduce a stress concentration.

Substituting one for the other is a mechanical decision, not an electrical one. The motor performance, amplifier wiring, and CNC parameters are identical for both.

αA64 Absolute Pulsecoder: 64,000 Counts Per Revolution

The αA64 pulsecoder is a serial-output optical absolute encoder built into the rear of the motor housing. It reports shaft position at a resolution of 64,000 counts per revolution — high enough for the fine interpolation demanded by contouring operations on CNC machine tools. The encoder operates in absolute mode: the machine position is retained without a reference-return run at every power-up.

Absolute retention relies on a lithium backup battery housed inside the servo amplifier, not inside the motor. This is an important maintenance detail. When the A06B-0162-B575#0076 is installed as a replacement motor, the absolute position stored in the battery-backed encoder memory belongs to the encoder unit removed with the old motor. The new motor's encoder arrives without machine position data. After installation, a reference-return on the affected axis is required to re-establish the absolute coordinate, even if the amplifier battery is in good condition. Once the reference is taken, the amplifier stores the absolute offset and normal zero-return-free operation resumes.

FANUC recommends battery replacement at planned intervals — typically every two to three years for machines in regular production — to avoid unplanned position data loss. The relevant alarms are SV5136 (battery low) and SV5137 (battery zero); SV5136 allows planned maintenance before data is compromised, SV5137 indicates data has already been lost.

Compatible Servo Amplifiers

The A06B-0162-B575#0076 is electrically identical to all other B575-series αM6/3000 motors. Amplifier selection follows the same criteria as any αM6/3000:

The motor requires an 80A-rated channel (M-axis designation on dual-axis modules). Amplifier channel assignment must match the original machine design; do not use a lower-rated amplifier channel for an 80A motor.

Connector Sealing: The Detail That Makes IP67 Conditional

FANUC's technical documentation is specific on one point: the IP67 rating of the pulsecoder connector is achieved only when the feedback cable connector is fully and correctly engaged. An incompletely engaged or damaged cable connector does not deliver IP67 sealing at the connector interface — cutting fluid can enter the pulsecoder interior from the connector join even if the motor body itself is sealed.

This matters for service. After any repair or motor replacement involving disconnection and reconnection of the pulsecoder feedback cable:

1. The connector must be pushed fully home until the locking mechanism clicks or the retaining ring engages completely.
2. The connector assembly method must follow the FANUC feedback cable engagement procedure; a field-assembled connector must be built to specification using proper tooling and correct waterproof-grade cable components.
3. For the power connector, the same attention applies — incomplete engagement defeats the seal.

On machines where the motor is routinely exposed to high-pressure coolant or wash-down, verify connector condition at each preventive maintenance inspection. Coolant that bypasses a degraded connector seal reaches the pulsecoder before any external signs of failure are visible.

Typical Installation Environments and Machine Types

Across the installed base of FANUC Alpha series CNC machines, the IP67 sealed variants (both #0075 and #0076) are most commonly found in:

• Horizontal machining centres (HMCs): Axis motors located on the column and saddle are directly in the path of chip-laden coolant drainage; IP67 is frequently specified by HMC builders for all feed-axis motors.
• CNC lathes with live tooling: Y-axis and live tool axis motors sit close to the work zone where coolant is directed at high pressure.
• Transfer lines and special-purpose machines: Where wash-down cycles clean the fixture area between parts and water accumulation around axis motors is expected.
• Grinding machines using water-soluble grinding fluid: High-volume coolant application in flat and cylindrical grinding creates persistent mist that settles on all surfaces in the grinding zone.

Non-sealed motors (IP65) continue to be used in applications where coolant exposure is modest and a telescopic cover or bellows keeps the motor body out of the direct splash zone. The choice of IP67 over IP65 is always application-specific; specifying IP67 universally adds unnecessary cost on installations where IP65 would perform satisfactorily for the machine's full service life.

A06B-0162-B575 Series Variant Summary

All variants: αM6/3000, 1.4 kW, 6 Nm, 3,000 rpm, 144 V, 200 Hz, 6 A, αA64 absolute pulsecoder.

FAQ

Q1: What is the difference between A06B-0162-B575#0076 and A06B-0162-B575#0008, and when should each be chosen?

Both motors are αM6/3000 units with a straight keyed shaft, no brake, and an αA64 absolute pulsecoder — so their mechanical and electrical specifications are identical. The only difference is the sealing level. The #0008 carries the standard Alpha series protection of IP65, which resists dust ingress completely and handles water jets from any direction. The #0076 upgrades this to IP67, adding protection against temporary immersion and more intensive liquid exposure. For most enclosed CNC machine installations where a machine guard, sheet metal cover, or telescopic axis guard keeps the motor body away from direct coolant spray, #0008 is sufficient and is the more commonly stocked variant. The #0076 is specified where the motor is inevitably exposed to pooling coolant, high-volume splash without adequate guarding, or wash-down sequences — typically horizontal machining centres, some CNC lathe configurations, and transfer line machines. If the machine's original nameplate or parts list specifies #0076, replace like-for-like; do not substitute #0008 in an application that called for IP67.

Q2: Can the A06B-0162-B575#0076 be used as a direct replacement for an A06B-0162-B575#0075 already installed in a machine?

Yes, physically and electrically. The #0075 (straight shaft, no keyway, IP67) and #0076 (straight shaft, with keyway, IP67) are the same motor in every respect except the shaft keyway. Replacing #0075 with #0076 in a machine where the existing coupling has a smooth bore will not cause problems — the key slot on the shaft will simply sit unused inside the smooth-bore coupling. Replacing #0075 with #0076 in a machine where the coupling has a keyed bore requires a parallel key to be fitted in the keyway during installation. The more important question is the reverse: do not replace a #0076 with a #0075 in a machine where the coupling relies on a key to transmit torque, as the plain shaft will not interlock with the coupling's keyway bore.

Q3: After replacing this motor, does the machine need to go through a full re-referencing procedure before it can run production parts?

For any absolute encoder-equipped FANUC servo motor replacement, a reference-return is required on the affected axis after installation. The reason is that the αA64 pulsecoder in the replacement motor has no stored machine position; absolute position data belongs to the encoder, which has been removed with the old motor. Even if the servo amplifier battery is fully charged, it contains position data referenced to the previous motor's encoder — this data is invalid for the new motor. After installation and power-up, the CNC will typically display a reference-point-return request on the affected axis. Once the axis reference point is established, the amplifier stores the new absolute position offset and the machine is ready for normal operation. For multi-axis machines, only the axis whose motor was replaced needs to be re-referenced; other axes are unaffected.

Q4: The machine uses synthetic water-soluble cutting fluid rather than mineral oil coolant. Does IP67 sealing remain adequate?

FANUC's documentation notes that the IP67 rating applies to water and water-based fluids under the test conditions of the IEC standard. However, FANUC also specifies that synthetic cutting fluids — including oil-free aqueous synthetics — may behave differently from plain water, and that no servo motor is guaranteed to be impervious to cutting fluid applied directly and continuously. The recommended approach for machines using aggressive cutting fluids is to ensure that the motor body is shielded from direct coolant application by a cover or guard, and to inspect connector integrity more frequently. IP67 sealed motors offer significantly better resistance than IP65 in these environments, but the protection is not unconditional. In addition, FANUC cautions that cutting fluid containing highly active sulfur compounds can be particularly aggressive to sealing materials; if the fluid specification includes high-pressure sulfur additives, consult FANUC's application engineering guidelines for the specific fluid type.

Q5: Is this motor still in production, and what modern FANUC motor is the closest functional equivalent?

The FANUC Alpha (α) series, including the A06B-0162-B575#0076, has been discontinued as a current production item by FANUC. It is no longer manufactured new. Sourcing options are: new-old-stock (NOS) from authorised spare parts channels or industrial surplus distributors; or fully refurbished exchange units from servo motor repair specialists. For a new-technology equivalent, the closest current FANUC motor is in the αiF series — specifically the αiF 8/3000 or αiF 8/2000 range (A06B-0227-B*** series), which uses the current αiA pulsecoder platform and is compatible with αi series servo amplifiers. However, substituting an αiF motor is not a drop-in replacement: it requires an αi series amplifier (if not already installed), new motor cables, and re-parameterisation of the axis machine data in the CNC. A qualified FANUC service engineer or authorised integrator should carry out this type of cross-series substitution, as incorrect parameters after a motor model change can result in axis instability or drive alarms.