Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors - Manual (Page 101)

4.2 Settings for Common Basic Functions
4-11
4
Operation
(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