4.2 Settings for Common Basic Functions
4-9
4
Operation
4.2.4
Electronic Gear
(1) Linear Scale Feedback Resolution
The following table shows the pitch (Pn282) and the number of divisions for a linear scale.
∗
These values are set to facilitate the internal processing of the SERVOPACK.
For details on the pitch (Pn282) and the number of divisions for a linear scale, refer to the manuals of the linear scale and
serial converter unit to be used.
(2) Electronic Gear
The electronic gear enables the workpiece travel distance per input reference pulse from the host controller to
be set to any value. One reference pulse from the host controller, i.e., the minimum position data unit, is called
a reference unit.
<Example> When the number of divisions of serial converter unit is 256:
Linear Scale
Type
Manufacturer
Linear Scale Model
Linear Scale
Pitch
[
μ
m]
Serial Converter
Unit Model
No. of
Divisions
Resolution
[
μ
m]
Incremental
Heidenhain Corpo-
ration
LIDA48
20
JZDP-D003-
-E
256
0.078
JZDP-G003-
-E
4096
0.0049
LIDA18
40
JZDP-D003-
-E
256
0.156
JZDP-G003-
-E
4096
0.0098
LIF48
4
JZDP-D003-
-E
256
0.016
JZDP-G003-
-E
4096
0.00098
Renishaw plc
RGH22B
20
JZDP-D005-
-E
256
0.078
JZDP-G005-
-E
4096
0.0049
Absolute
Magnescale Co.,
Ltd.
SR77-
LF
80
–
8192
0.0098
SR77-
MF
80
–
1024
0.078
Mitutoyo Corpora-
tion
ST781A
256*
–
512*
0.5
ST782A
256*
–
512*
0.5
ST783
51.2*
–
512*
0.1
ST784
51.2*
–
512*
0.1
When the Electronic Gear
is Not Used
When the Electronic Gear
is Used
To move a workpiece 10 mm
The scale pitch is 20
μ
m. Therefore,
10
1000
¸
20
256=128000 pulses
128000 pulses are input as reference
pulses.
The equation must be calculated at
the host controller.
To move a workpiece 10 mm using reference units
1 reference unit is 1
μ
m.
To move a workpiece 10 mm (10000
μ
m),
1 pulse = 1
μ
m,
10000/1=10000 pulses.
Input 10000 pulses as reference input.
Linear scale
Linear scale
Reference unit
1
µ
m