YASKAWA Sigma-V Series User Manual page 118

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