Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors MECHATROLINK-III Communications Reference - Manual (Page 113)

4.4 Trial Operation
4-25
4
Op
er
at
io
n
(2) Electronic Gear Ratio Setting Examples
The following examples show electronic gear ratio settings for different load configurations.
Example: The number on divisions on the serial converter unit: 256
Refer to the following equation to determine the electric gear ratio.
Step Operation Load Configuration
1 Check the scale pitch. 0.02 mm (20 μm)
2 Determine the reference
unit. 1 reference unit: 0.001 mm (1 μm)
3 Calculate the electronic
gear ratio.
4 Set parameters. Pn20E 256
Pn210 20
A 20( μm)
B 1( μm)
=
× 256
A
B
+
−
Movement distance L㧔mm㧕
Ps
L
L 㧔mm㧕㧦Movement distance
Posi-
tion
loop Speed
loop
Position reference
㧔mm/P㧕 Δ
Δ㧔mm/P㧕㧦Reference unit
Ps 㧔mm㧕㧦Scale pitch
mm/scale pitch㧕
Servomotor
×
256
48 and 65
L
Ps × L
B
Δ A Ps
L
Ps
Δ Δ
× ( ) = 256 ×
B
A
( ) = =
256 × L × 256 ×
Set A and B with the following parameters.
A 㧦Pn20E B 㧦Pn210
Linear