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5.16 Electronic Gear Settings
5.16.1 Electronic Gear Ratio Settings
5
Ba
s
ic Function
s
That Requir
e
S
etting befor
e Operation
5-49
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.
*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).
6.8.2 Setting for the Encoder Divided Pulse Output
Type of
Linear
Encoder
Manufacturer
Linear Encoder
Model
Linear
Encoder
Pitch
[
μ
m]
Model of Serial Con-
verter Unit or Model of
Interpolator
Resolution Resolution
Incremen-
tal
Heidenhain
Corporation
LIDA48
20
JZDP-H003-
-E
*1
256
0.078
μ
m
JZDP-J003-
-E
*1
4,096
0.0049
μ
m
LIF48
4
JZDP-H003-
-E
*1
256
0.016
μ
m
JZDP-J003-
-E
*1
4,096
0.00098
μ
m
Renishaw
PLC
RGH22B
20
JZDP-H005-
-E
*1
256
0.078
μ
m
JZDP-J005-
-E
*1
4,096
0.0049
μ
m
Magnescale
Co., Ltd.
SR75-
LF
*4
80
–
8,192
0.0098
μ
m
SR75-
MF
80
–
1,024
0.078
μ
m
SR85-
LF
*4
80
–
8,192
0.0098
μ
m
SR85-
MF
80
–
1,024
0.078
μ
m
SL700
*4
, SL710
*4
,
SL720
*4
, SL730
*4
800
PL101-RY
*2
8,192
0.0977
μ
m
MJ620-T13
*3
SQ10
400
MQ10-FLA
*3
8192
0.0488
μ
m
MQ10-GLA
*3
Absolute
Heidenhain
Corporation
LIC4100 Series
20.48
EIB3391Y
*3
4,096
0.005
μ
m
LC115
40.96
EIB3381Y
*3
4,096
0.01
μ
m
Mitutoyo
Corporation
ST781A/ST781AL
256
–
512
0.5
μ
m
ST782A/ST782AL
256
–
512
0.5
μ
m
ST783/ST783AL
51.2
–
512
0.1
μ
m
ST784/ST784AL
51.2
–
512
0.1
μ
m
ST788A/ST788AL
51.2
–
512
0.1
μ
m
ST789A/ST789AL
25.6
–
512
0.05
μ
m
ST1381
5.12
–
512
0.01
μ
m
ST1382
0.512
–
512
0.001
μ
m
Magnescale
Co., Ltd.
SR77-
LF
*4
80
–
8,192
0.0098
μ
m
SR77-
MF
80
–
1,024
0.078
μ
m
SR87-
LF
*4
80
–
8,192
0.0098
μ
m
SR87-
MF
80
–
1,024
0.078
μ
m
Resolution
You can calculate the resolution that is used inside the SERVOPACK (i.e., the travel distance per
feedback pulse) with the following formula.
The SERVOPACK uses feedback pulses as the unit to control a Servomotor.
Information
Re
s
olution (travel di
s
tance per feedback pul
s
e) =
Linear encoder pitch
Re
s
olution of
S
erial Converter Unit or linear encoder
Linear encoder pitch
Linear encoder pitch
=Distance for one cycle of the analog voltage
feedback signal from the linear encoder