
4.SERVO FUNCTION DETAILS B-65270EN/05
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Table 4.14.1 (a) Examples of usable linear encoders (incremental)
Encoder maker Signal pitch (µm) Model
FUTABA
CORPORATION
20 FTV, FMV
Sony Precision
Technology Inc.
20 SH12, SH52
Absolute type
The linear encoder of absolute type is directly connected to a servo
amplifier. Depending on the resolution of an encoder used, the
parameter setting varies. First, check the resolution. Table 4.14.1(b)
lists examples of absolute type linear encoders currently usable.
Table 4.14.1 (b) Usable linear encoders (absolute)
Encoder maker Resolution (µm) Model
HEIDENHAIN 0.05 (0.1)* LC191F, LC491F
MITSUTOYO 0.05 AT353, AT553
* Encoders with resolutions of 0.05 µm and 0.1 µm are available.
NOTE
1 For details of the linear encoders usable with
FANUC linear motors, refer to "FANUC LINEAR
MOTOR Lis series DESCRIPTIONS (B-65382EN)".
2 For details of the linear encoders, contact the
manufacturer of each linear encoder.
3 When servo HRV4 control is to be used with a
linear motor, the AT553 (Mitsutoyo Co., Ltd.) or a
high-resolution serial circuit must be used.
(4) Parameter settings
Set the parameters according to the procedure below. Note the points
below when setting the parameters.
[Cautions for using incremental linear encoders]
The following parameter setting procedure involves a parameter
to be specified according to the resolution of the linear encoder.
If an incremental linear encoder is to be used, convert the
encoder signal pitch to the resolution for parameter calculation,
using the following equation.
Resolution [µm] = Encoder signal pitch [µm] / 512
[Note on pole-to-pole spans]
In the parameter setting procedure below, there is a parameter
dependent on the pole-to-pole span. The table below indicates the
pole-to-pole span of each motor model.
Table 4.14.1(c) List of pole-to-pole spans
Classification Pole-to-pole span (D) Motor model
Small motor 30mm
L300Ais, L600Ais, L900Ais
Medium-size motor,
large motor
60mm Models other than above