FANUC A860-2000-T301 Alpha iA1000 Pulse Coder Encoder for CNC Servo Motor Feedback

The FANUC A860-2000-T301 is an Alpha iA1000 pulse coder used as a motor feedback device in compatible FANUC CNC drive systems.

Mounted at the rear of the motor, the pulse coder detects shaft rotation and provides position and speed feedback to the connected control system. The feedback signal allows the CNC and drive system to regulate motor movement, monitor rotational position, and maintain coordinated axis operation.

The A860-2000-T301 is identified in FANUC motor maintenance documentation as the replacement ordering specification for the α1000iA Pulsecoder. During replacement, the encoder is removed together with its Oldham coupling and installed with the correct coupling orientation and sealing arrangement.

Unlike a general-purpose external rotary encoder, this model is designed as a motor-mounted feedback component for a defined FANUC motor and CNC architecture. The exact motor model, encoder interface, connector, mounting pattern, coupling, and software configuration must therefore be checked before installation.

The A860-2000-T301 should not be described as a servo amplifier, spindle amplifier, CNC controller, motor driver, power supply module, or encoder circuit board.

Key Features

Alpha iA1000 pulse coder configuration

Motor-mounted rotary feedback design

Position feedback for CNC motor control

Speed feedback for closed-loop regulation

Compatible with defined FANUC CNC systems

Designed for motor rear installation

Uses an Oldham coupling arrangement

Supports precise motor rotation monitoring

Suitable for maintenance and replacement projects

Exact-model industrial feedback component

Typical Applications

CNC machining centers

CNC milling machines

CNC turning centers

Grinding machines

Servo-controlled machine axes

FANUC motor maintenance

CNC drive-system repair

Industrial motor feedback replacement

Machine-tool retrofit projects

Installation Notes

Confirm the complete model number A860-2000-T301 on the original encoder label before replacement.

Check the following items:

Motor model

Original pulse coder designation

Connector and cable type

Mounting-hole arrangement

Oldham coupling condition

Coupling orientation

Encoder sealing components

CNC feedback configuration

Machine reference position

Do not install the encoder based only on external appearance. Similar A860-series pulse coders may use different feedback formats or motor interfaces.

After installation, verify encoder communication, motor rotation direction, servo alarms, reference return, position accuracy, and machine parameters before production operation.

FAQ

Q

What type of product is A860-2000-T301

A

It is a FANUC Alpha iA1000 motor pulse coder used for position and speed feedback

Q

Is A860-2000-T301 a servo drive

A

No it is a motor feedback encoder and does not supply power to the motor

Q

Where is the pulse coder installed

A

It is mounted on the rear feedback section of a compatible motor

Q

What is the official encoder designation

A

FANUC maintenance documentation identifies it as the Alpha 1000iA Pulsecoder

Q

Does installation require a coupling

A

Yes the maintenance procedure describes an Oldham coupling between the motor and pulse coder

Q

Can it replace any A860-series encoder

A

No the exact motor model encoder interface mechanical installation and part number must be matched