FANUC A06B-2238-B000 αiS 12/4000-B AC Servo Motor with αiA 4000 Pulse Coder

The B000 configuration does not include a holding brake. Its tapered shaft and feedback type must match the original mechanical assembly, amplifier and CNC parameters before installation.

Confirmed Motor Specifications

• Manufacturer: FANUC
• Part number: A06B-2238-B000
• Motor model: αiS 12/4000-B
• Rated output: 2.7 kW
• Continuous torque at low speed: 12 N·m
• Continuous current at low speed: 13.4 A RMS
• Rated speed: 3,000 min⁻¹
• Maximum speed: 4,000 min⁻¹
• Maximum torque: 46 N·m
• Shaft: Tapered shaft
• Holding brake: Not fitted
• Feedback: FANUC αiA 4000 absolute pulse coder

Tapered-Shaft B000 Configuration

A06B-2238-B000 uses a tapered shaft for connection to the corresponding machine coupling or mechanical assembly. Related A06B-2238 versions may use straight, keyed or braked configurations, so a similar motor frame does not establish mechanical interchangeability.

αiA 4000 Absolute Feedback

The αiA 4000 pulse coder supplies rotor position and speed information to the FANUC servo-control system. Absolute-position retention depends on the applicable backup-battery circuit. Check battery condition and follow the machine manufacturer's encoder-disconnection procedure before removing the motor.

A06B-2238 and A06B-0238 Difference

A06B-2238-B000 identifies the αiS 12/4000-B generation with αiA 4000 feedback. It should not be confused with A06B-0238-B000, which is indexed as an earlier αiS 12/4000 motor using a different A1000 feedback configuration. Do not substitute one solely because the torque and speed class appears similar.

Suffix and Protection Notice

The complete specification may include an additional suffix. For example, A06B-2238-B000#0100 is identified as a sealed IP67 version. IP67 protection must not be assumed for an unsuffixed unit; always compare the full number on the original and replacement nameplates.

Replacement Compatibility Check

Before ordering, verify the full FANUC number and suffix, αiS 12/4000-B requirement, tapered shaft, no-brake configuration, αiA 4000 feedback, connector orientation, mounting dimensions, servo amplifier compatibility and existing CNC parameters.

100% Tested Supply from REACO CNC

REACO CNC supplies the FANUC A06B-2238-B000 servo motor for maintenance and replacement requirements. Each available unit is 100% tested before shipment. Send us the original nameplate photo if you need assistance checking the suffix and configuration.

Worldwide DHL/UPS/FedEx shipping. Contact REACO CNC for current stock, condition, price and delivery time.