
1.SYSTEM CONFIGURATION CONFIGURATIONS AND SELECTION B-65222EN/03
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1.1 INCREMENTAL LINEAR ENCODER SYSTEM
For the FANUC Linear Motor series, motors are controlled using
feedback signals from a linear encoder. This section explains a system
in which an incremental linear encoder is used.
1.1.1 Example of Configuration
For a system in which an incremental linear encoder is used, the
following devices are required to configure a motor, in addition to a
coil slider and magnet plate.
Magnetic pole sensor
The magnetic pole sensor is a sensor to simply determine the position
of the motor for each magnetic pole before the zero point is checked
at start (the reference mark signal is detected).
Position detection circuit
The position detection circuit converts signals output from the
magnetic pole sensor and linear encoder to FANUC serial interface
signals and outputs the converted signals to the servo amplifier or
CNC. This circuit internally multiplies a signal output from the
encoder by 512 and outputs the multiplied signal. For examples, when
the scale pitch is 20 µm, the resolution is about 0.04 µm.
NOTE
For the specifications of the magnetic pole sensor
and position detection circuit, see Part I,
"SPECIFICATIONS."
An example of a typical system configuration is shown below:
Power line
Thermostat line
Servo amplifier
Magnet plate Coil slider
Magnetic pole sensor
Linear encoder
Position detection circuit
FSSB
This system requires detection of the zero point whenever the power
to the NC is turned on or off.
NOTE
For how to install the linear encoder, see Part III,
"HANDLING, DESIGN, AND INSTALLATION."