YASKAWA SGDV SERVOPACK, User Manual

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5.4 Position Control
5-45
5
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

m)
2 Determine the reference
unit.
1 reference unit: 0.001 mm (1

m)
3 Calculate the electronic
gear ratio.
4 Set parameters. Pn20E 256
Pn210 20
A 20(
µ
m)
B
1(
µ
m)
=
×
256
A
B
+
−
×
256
Movement distance L 㧔 mm 㧕
Ps
L
L 㧔 mm 㧕㧦 Movement distance
Posi-
tion
loop
Speed
loop
Reference pulse
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
47
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