YASKAWA SGD7S Product Manual page 178

5.14 Electronic Gear Settings
5.14.1 Electronic Gear Ratio Settings
Type of
Linear
Encoder
Absolute
*1.
This is the model of the Serial Converter Unit.
*2.
This is the model of the Head with Interpolator.
*3.
This is the model of the Interpolator.
*4.
If you use an encoder pulse output with this linear encoder, the setting range of the encoder output resolution
(Pn281) is restricted. Refer to the following section for details on the encoder output resolution (Pn281).
Information
5-44
Linear Encoder
Manufacturer
Model
LIC4100 Series
Heidenhain
Corporation
LC115
ST781A/ST781AL
ST782A/ST782AL
ST783/ST783AL
ST784/ST784AL
Mitutoyo
Corporation
ST788A/ST788AL
ST789A/ST789AL
ST1381
ST1382

SR77-

SR77-
Magnescale
Co., Ltd.

SR87-

SR87-
6.5.2 Setting for the Encoder Divided Pulse Output on page 6-14
Resolution
You can calculate the resolution that is used inside the SERVOPACK (i.e., the travel distance per
feedback pulse) with the following formula.
Resolution (travel distance per feedback pulse) =
The SERVOPACK uses feedback pulses as the unit to control a Servomotor.
Linear encoder pitch
Linear
Encoder
Converter Unit or
Pitch
Model of Interpolator
[μm]
20.48
40.96
256
256
51.2
51.2
51.2
25.6
5.12
0.512
*4
80
LF
MF 80
*4
80
LF
MF 80
Resolution of Serial Converter Unit or linear encoder
Linear encoder pitch
=Distance for one cycle of the analog voltage
feedback signal from the linear encoder
Continued from previous page.
Model of Serial
Resolution Resolution
*3
4,096
EIB3391Y
*3
4,096
EIB3381Y
– 512
– 512
– 512
– 512
– 512
– 512
– 512
– 512
– 8,192
– 1,024
– 8,192
– 1,024
Linear encoder pitch
0.005 μm
0.01 μm
0.5 μm
0.5 μm
0.1 μm
0.1 μm
0.1 μm
0.05 μm
0.01 μm
0.001 μm
0.0098 μm
0.078 μm
0.0098 μm
0.078 μm