YASKAWA SGD7S Product Manual page 171

 Linear Servomotors
You can calculate the settings for the electronic gear ratio with the following equation:
When Not Using a Serial Converter Unit
Use the following formula if the linear encoder and SERVOPACK are connected directly or if a
linear encoder that does not require a Serial Converter Unit is used.
B Pn20E
=
Electronic gear ratio
A Pn210
When Using a Serial Converter Unit
B Pn20E
=
Electronic gear ratio
A Pn210
 Feedback Resolution of Linear Encoder
The linear encoder pitches and resolutions are given in the following table.
Calculate the electronic gear ratio using the values in the following table.
Type of
Linear Manufacturer
Encoder
LIDA48
Heidenhain
Corporation
LIF48
Renishaw
RGH22B
PLC
Incremen-
SR75-
tal
SR75-
SR85-
SR85-
Magnescale
Co., Ltd.
SL700
SL720
SQ10
LIC4100 Series
Heidenhain
Corporation
LC115
ST781A/ST781AL
ST782A/ST782AL
ST783/ST783AL
ST784/ST784AL
Mitutoyo
Corporation
ST788A/ST788AL
Absolute
ST789A/ST789AL
ST1381
ST1382
SR77-
SR77-
Magnescale
Co., Ltd.
SR87-
SR87-
*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.
Travel distance per reference unit (reference units) × Linear encoder resolution
=
Linear encoder pitch (the value from the following table)
Travel distance per reference unit (reference units) × Resolution of the Serial Converter Unit
=
Linear encoder pitch (setting of Pn282)
Linear
Linear Encoder Encoder
Model Pitch
[μm]

20

4
20
*4
 80
LF

MF 80
*4
 80
LF

MF 80
*4 *4
, SL710 ,
800
*4, *4
SL730
400
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
5.15 Electronic Gear Settings
5.15.1 Electronic Gear Ratio Settings
Model of Serial Con-
verter Unit or Model of Resolution Resolution
Interpolator
*1

JZDP-H003- -E
*1

4,096
JZDP-J003- -E
*1

JZDP-H003- -E
*1

4,096
JZDP-J003- -E
*1

JZDP-H005- -E
*1
 4,096
JZDP-J005- -E
– 8,192
– 1,024
– 8,192
– 1,024
*2
PL101-RY
8,192
*3
MJ620-T13
*3
MQ10-FLA
*3
MQ10-GLA
*3
4,096
EIB3391Y
*3
4,096
EIB3381Y
–
–
–
–
–
–
–
–
– 8,192
– 1,024
– 8,192
– 1,024
0.078 μm
256
0.0049 μm
0.016 μm
256
0.00098 μm
0.078 μm
256
0.0049 μm
0.0098 μm
0.078 μm
0.0098 μm
0.078 μm
0.0977 μm
0.0488 μm
8192
0.005 μm
0.01 μm
0.5 μm
512
0.5 μm
512
0.1 μm
512
0.1 μm
512
0.1 μm
512
0.05 μm
512
0.01 μm
512
0.001 μm
512
0.0098 μm
0.078 μm
0.0098 μm
0.078 μm
5-43
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