YASKAWA SGDV SERVOPACK, User Manual

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5 Operation
5.4.4 Electronic Gear
5-44
The electronic gear ratio to be set can be calculated by the following equation:

Feedback Resolutions of Linear Scale
Calculate the electronic gear ratio with the values in the following table.

Models for serial converter units.

Models for heads with interpolators.

Models for interpolators.

When using the encoder pulse output with these linear scales, the setting range of Pn281 is restricted. For details,
refer to
5.3.7 Setting Encoder Output Pulse .

For details on this linear scale, contact Mitutoyo.
Refer to the manuals for the linear scale and the serial converter unit for details on the scale pitch and the num-
ber of divisions on the linear scale.
Electronic gear ratio:
=
A
B
Pn210
Pn20E
=
Linear scale pitch
Travel distance per reference unit Number of divisions of serial converter unit
Linear
Type of Lin-
ear Scale
Manufacturer Linear Scale Model
Linear
Scale Pitch
[

m]
Models for Serial
Converter Unit or
Models for Head with
Interpolator
Number
of Divi-
sions
Resolution
Incremental
Heidenhain
LIDA48

20
JZDP-D003-000-E
*1
256 0.078

m
JZDP-G003-000-E
*1
4096 0.0049

m
LIDA18

40
JZDP-D003-000-E
*1
256 0.156

m
JZDP-G003-000-E
*1
4096 0.0098

m
LIF48

4
JZDP-D003-000-E
*1
256 0.016

m
JZDP-G003-000-E
*1
4096 0.00098

m
Renishaw plc RGH22B 20
JZDP-D005-000-E
*1
256 0.078

m
JZDP-G005-000-E
*1
4096 0.0049

m
Magnescale Co., Ltd.
SR75-

LF
*4
80 – 8192 0.0098

m
SR75-

MF 80 – 1024 0.078

m
SR85-

LF
*4
80 – 8192 0.0098

m
SR85-

MF 80 – 1024 0.078

m
SL700
*4
, SL710
*4
,
SL720
*4
, SL730
*4
800
PL101-RY
*2
8192 0.0977

m
MJ620-T13
*3
Absolute
Mitutoyo Corporation
ST781A/ST781AL 256 – 512 0.5

m
ST782A/ST782AL 256 – 512 0.5

m
ST783/ST783AL 51.2 – 512 0.1

m
ST784/ST784AL 51.2 – 512 0.1

m
ST788A/ST788AL 51.2 – 512 0.1

m
ST789A/ST789AL
*5
25.6 – 512 0.05

m
Magnescale Co., Ltd.
SR77-

LF
*4
80 – 8192 0.0098

m
SR77-

MF 80 – 1024 0.078

m
SR87-

LF
*4
80 – 8192 0.0098

m
SR87-

MF 80 – 1024 0.078

m
Electronic gear ratio setting range: 0.001

Electronic gear ratio (B/A)

4000
If the electronic gear ratio is outside this range, a parameter setting error 1 (A.040) will
be output.