YASKAWA SGDV series - Page 107

4.2 Basic Functions Settings
4-11
4
Operation
(2) Electronic Gear Ratio Setting Examples
The following examples show electronic gear ratio settings for different load configurations.
Step Operation
Load Configuration
Ball Screw Disc Table Belt and Pulley
1
Check machine specifica-
tions.
 Ball screw pitch: 6 mm
 Gear ratio: 1/1
Rotation angle per revolu-
tion: 360°
Gear ratio: 1/100
Pulley diameter: 100 mm
(pulley circumference: 314
mm)
• Gear ratio: 1/50
2
Check the encoder reso-
lution.
1048576 (20-bit) 1048576 (20-bit) 1048576 (20-bit)
3
Determine the reference
unit used.
Reference unit: 0.001 mm
(1 μm)
Reference unit: 0.01°
Reference unit: 0.005 mm
(5 μm)
4
Calculate the travel dis-
tance per load shaft revo-
lution. (Reference unit)
6 mm/0.001 mm = 6000 360°/0.01° = 36000
314 mm/0.005 mm =
62800
5
Calculate the electronic
gear ratio.
6 Set parameters.
Pn20E: 1048576 Pn20E: 104857600 Pn20E: 52428800
Pn210: 6000 Pn210: 36000 Pn210: 62800
Ball screw
pitch: 6 mm
20-bit encoder
Load shaft
Reference unit: 0.001 mm
20-bit encoder
Load shaft
Reference unit: 0.01°
Gear ratio:
1/100
Load shaft
Gear ratio
1/50
Reference unit: 0.005 mm
Pulley diameter:
100 mm
20-bit encoder
1048576
6000
1
1
=

B
A
B
A
1048576
36000
100
1
=

B
A
1048576
62800
50
1
=
