YASKAWA E-V-MD Series User Manual page 124

(2) Electronic Gear Ratio Setting Examples
The following examples show electronic gear ratio settings for different load configurations.
Step Operation
Check machine specifi-
1
cations.
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
Load shaft
17-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
131072 (17-bit) 131072 (17-bit)
Reference unit: 0.001 mm
Reference unit: 0.01°
(1 μm)
6 mm/0.001 mm=6000 360°/0.01°=36000
B 131072 1 B
×
=
A 6000 1 A
PnA42: 131072 PnA42: 13107200
PnA44: 6000 PnA44: 36000
Load Configuration
Disc Table
Reference unit: 0.01
Reference unit: 0.005 mm
Gear ratio:
Gear ratio
1/100
1/50
17-bit encoder
Pulley diameter: 100 mm
(pulley circumference: 314
mm)
• Gear ratio: 1/50
131072 (17-bit)
Reference unit: 0.005 mm
(5 μm)
314 mm/0.005 mm=62800
131072 100 B
=
× =
36000 1 A
PnA42: 6553600
PnA44: 62800
7.4 Trial Operation
Belt and Pulley
Load shaft
Pulley diameter:
100 mm
17-bit encoder
131072 50
×
62800 1
7
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