Description

The A06B-0268-B605 is a high-performance Alpha iS series AC Servo Motor (specifically model \alpha iS 22/4000) manufactured by Fanuc.

This model is typically deployed as a primary axis driver (such as an X, Y, or Z axis feed) on mid-to-large-sized CNC machining centers and turning centers. The \alpha iS series is engineered with a high rotor inertia profile and dense neodymium magnets, providing excellent acceleration dynamics, smooth low-speed rotation, and stable torque output under heavy mechanical cutting loads.

Technical Specifications

The model suffix (-B605) specifies the specific output shaft geometry, internal safety braking hardware, and default feedback system integrated into the casing:

Field Application and System Integration Notes

Tapered Shaft Alignment Considerations

The -B605 configuration designates a tapered output shaft featuring a machined keyway.

• Backlash Elimination: Machine builders use tapered shafts to mate the motor tightly with timing pulleys or high-precision mechanical couplings. The wedge fit completely eliminates rotational backlash, which is critical for maintaining positioning accuracy during rapid axis reversals.
• Mechanical Warning: When fitting or removing a pulley, never use a hammer on the shaft end. Mechanical shock will travel straight through the rotor and fracture the fragile glass scale inside the rear pulse coder, causing immediate feedback loop failure. Always use a proper mechanical puller tool.

24 V DC Holding Brake Power Sequencing

This motor includes an internal electromagnetic spring-set holding brake designed to anchor the axis when power is removed—especially vital for preventing vertical Z-axis drop or inclined bed sliding.

• Static Holding Only: This brake is strictly a holding device, not a dynamic stopping brake. If the brake is repeatedly engaged while the motor is spinning at high RPM (such as during improper emergency-stop sequencing), the internal friction linings will quickly overheat and glaze over, permanently lowering its holding capacity.
• PLC Interlock Rules: Ensure your CNC safety PLC or Fanuc Servo Amplifier is configured to fully supply the 24 V DC release voltage prior to enabling the motor’s current loop, avoiding instances where the motor attempts to drive against its own mechanical lock.

Absolute Reference Recovery (Parameter 1815)

Because this motor relies on an absolute pulse coder (\alpha iAR128), replacing a damaged unit with a new or refurbished one will break your absolute coordinate tracking.

• On power-up, the CNC control will display an absolute position loss alarm (such as Fanuc Alarm 300).
• You must navigate to Fanuc Parameter 1815 (specifically setting the APC and APZ bits) or perform an authorized home-position teaching cycle to safely re-establish the absolute zero reference point relative to your physical machine travel limits and grid shifts.

Commercial and Procurement Data

• Product Condition: New Original (Factory Sealed Stock) or Refurbished/Tested Core Exchange (pressure cleaned, insulation Megger tested, coil resistance dynamically balanced, and verified on a live Fanuc test stand).
• Standard Warranty: 12-month comprehensive depot hardware warranty.
• Estimated Lead Time: Standard processing takes 1 to 2 business days from centralized inventory. Priority express courier dispatch is available to handle critical machine-down emergencies.
• Pricing Notice: Total procurement costs vary based on whether you participate in an active Core Exchange program (returning the defective motor core for a standard credit rebate). Contact our automated CNC components sales desk for an official commercial proposal.
  

  FANUC A06B-6290-H207 Alpha i Servo Amplifier Module (SVM2-40/40iF)

  Fanuc A860-2010-T341 Alpha i-A 128 Pulse Coder (Encoder)

  Fanuc A860-2060-T321 Pulse Coder \alpha iAR128 Encoder