YASKAWA Sigma-V Series User Manual page 163

5 Operation
5.4.4 Electronic Gear
(2) Electronic Gear Ratio Setting Examples
The following examples show electronic gear ratio settings for different load configurations.
Step
1
2
3
4
5
6
5-42
Operation
20-bit encoder
Check machine specifica- Ball screw pitch: 6 mm
tions.
Gear ratio: 1/1
Check the encoder reso-
1048576 (20-bit)
lution.
Determine the reference Reference unit: 0.001 mm
(1 μm)
unit used.
Calculate the travel dis-
tance per load shaft revo- 6 mm/0.001 mm = 6000
lution. (Reference unit)
Calculate the electronic
B
gear ratio.
A
Pn20E: 1048576
Set parameters.
Pn210: 6000
Load Configuration
Ball Screw
Reference unit: 0.001 mm
Reference unit: 0.01°
Load shaft
Ball screw
pitch: 6 mm
Load shaft
Rotation angle per revolu-
tion: 360°
Gear ratio: 1/100
1048576 (20-bit)
Reference unit: 0.01°
360°/0.01° = 36000
1048576 1 B
=
=
6000 1 A
Pn20E: 104857600
Pn210: 36000
Disc Table Belt and Pulley
Reference unit: 0.005 mm
Gear ratio:
Gear ratio
1/100
1/50
20-bit encoder
Pulley diameter: 100 mm
(pulley circumference: 314
mm)
• Gear ratio: 1/50
1048576 (20-bit)
Reference unit: 0.005 mm
(5 μm)
314 mm/0.005 mm =
62800
B 1048576
1048576 100
=
A
36000 1
Pn20E: 52428800
Pn210: 62800
Load shaft
Pulley diameter:
100 mm
20-bit encoder
50
62800 1