YASKAWA Σ-V Series User Manual page 98

(5) Electronic Gear Ratio Equation
Refer to the following equation to determine the electronic gear ratio.
<Example>
When the number of divisions in the serial converter unit is 256:
Reference pulse
B
A
mm/P
mm/P Reference unit
L mm Movement distance
Ps mm Scale pitch
L
B
× ( ) = 256 ×
A
B 256 × L ×
( ) =
A
(6) Electronic Gear Ratio Setting Example
An example of electronic gear ratio setting is given below.
<Example>
When the number of divisions in the serial converter unit is 256:
Step Operation
1 Check the scale pitch.
2 Determine the reference
unit.
3 Calculate the electronic
gear ratio.
4 Set parameters.
Linear servomotor
+
Posi-
Speed
tion
loop
− loop
×256
L
mm/scale pitch
Ps
L
Ps
256 ×
=
Ps × L Ps
Load Configuration
0.02 mm (20 μm)
1 reference unit: 0.001 mm (1 μm)
1 (μm)
B
× 256
=
A 20 (μm)
Pn20E
Pn210
4.2 Settings for Common Basic Functions
Movement distance L mm
Set A and B with the following parameters.
A Pn210 B Pn20E
256
20
4
4-11