4.2 Settings for Common Basic Functions
4-11
4
Operation
(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:
(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:
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
L
Ps
×
L
B
Δ
Δ
Δ
A
Ps
L
㧔
mm/P
㧕㧦
Reference unit
Ps
Δ
Δ
×
(
) = 256
×
B
A
(
) =
=
256
×
L
×
256
×
Set A and B with the following parameters.
A
㧦
Pn20E
B
㧦
Pn210
Ps
㧔
mm
㧕㧦
Scale pitch
mm/scale pitch
㧕
Linear servomotor
Step
Operation
Load Configuration
1
Check the scale pitch.
0.02 mm (20
μ
m)
2
Determine the reference
unit.
1 reference unit: 0.001 mm (1
μ
m)
3
Calculate the electronic
gear ratio.
4
Set parameters.
Pn20E
256
Pn210
20
A
20 (
μ
m)
B
1 (
μ
m)
=
×
256
