Description

The A860-2010-T341 is a high-resolution absolute rotary encoder, commercially designated by Fanuc as the Alpha i-A 128 Pulse Coder. This industrial feedback component mounts directly to the rear end-bell housing of Fanuc Alpha i series AC servo motors. It tracking real-time angular position, rotational speed, and acceleration coordinates, sending this high-speed serial feedback directly to the Fanuc CNC controller or servo amplifier module (such as the SVM Alpha i series) to close the position and velocity feedback loops.

Technical Specifications

Field Application and System Integration Notes

Parameter Retention and Absolute Zero Alignment

Because the A860-2010-T341 functions as an absolute encoder, it records the exact coordinates of the CNC machine axis.

• Battery-Backed Operation: The encoder relies on an external 3.6 V lithium battery pack located inside the servo amplifier unit to maintain its multi-turn absolute position data when the main CNC cabinet is powered down.
• Axis Reference Reset: If the feedback cable is disconnected or the amplifier battery runs completely flat while the system is powered off, the CNC will trigger an absolute position loss alarm (e.g., Fanuc Alarm 300 APC Alarm: Axis Need ZRN). You must execute an axis zero-point return (ZRN) sequence or manual parameter shift (Parameter 1815 for standard Fanuc 0i/16i/18i/31i controls) to re-establish the absolute reference position relative to physical machine limits.

Cable Shielding and Electrical Noise Mitigation

The serial communication link between the pulse coder and the drive operates at high frequencies, making it highly susceptible to electromagnetic interference (EMI).

• Ground Paths: Ensure the encoder cable features a continuous braided shield that terminates cleanly at the ground clamping plate of the servo amplifier. Avoid placing encoder signal conduits parallel to high-current power lines or motor stator cables.
• Signal Breakdown Symptoms: Poor shielding or a broken drain wire often results in random “Apc Communication Errors” (Fanuc Alarm 368/369), causing the axis to halt mid-cycle.

Mechanical Mechanical Installation and Sealing Precautions

• Coupling Alignment: When installing a replacement A860-2010-T341 onto the rear shaft of an Alpha i motor, take great care not to forcefully strike the encoder casing or apply excessive axial force to the encoder shaft. The internal code wheel matrix is highly fragile and prone to fracturing.
• Liquid Contamination: Always inspect the rubber gasket and liquid-tight seal of the motor end-bell. If coolant or spindle oil leaks into the encoder housing, it will distort the optical read head, leading to instant feedback failure and erratic axis movement.

Commercial and Procurement Data

• Product Condition: New Original (Factory Sealed Box) or Refurbished/Exchanged (fully cleaned, dynamically verified on a Fanuc test rig, and certified with output waveform alignment).
• Standard Warranty: 12-month comprehensive warranty from the date of logistics dispatch.
• Estimated Lead Time: In-stock processing takes 1 to 2 business days. Expedited global courier shipping is standard practice for critical downtime situations.
• Pricing Notice: Price structures are indicative and subject to active core exchange options and international component pipeline constraints. Contact our specialized CNC parts sales desk for an official, itemized commercial quote.