3 BASIC FUNCTION
3.9 Electronic gear function [G] [WG]
109
3
Ex.
Setting example for a ball screw
Machine specifications
Ball screw lead Pb = 10 [mm]
Reduction ratio: 1/n = Z
1
/Z
2
= 1/2
Z
1
: Number of gear teeth on servo motor side
Z
2
: Number of gear teeth on load gear
Servo motor encoder resolution: P
t
= 67108864 [pulse/rev]
Therefore, set CMX = 8388608 and CDV = 625.
*1 When the command unit is "pulse", convert as
α
= 1.
Ex.
Setting example for conveyors
Machine specifications
Pulley diameter: r = 160 [mm]
Reduction ratio: 1/n = Z
1
/Z
2
= 1/3
Z
1
: Number of gear teeth on servo motor side
Z
2
: Number of gear teeth on load gear
Servo motor encoder resolution: P
t
= 67108864 [pulse/rev]
Reduce CMX and CDV to the setting range or less and round off each value to the nearest whole number.
Therefore, set CMX = 524288 and CDV = 1309.
*1 When the command unit is "pulse", convert as
α
= 1.
67108864 [pulse/rev]
Pb = 10 [mm]
Z
1
1/n = Z
1
/Z
2
= 1/2
Z
2
1/n
Servo motor encoder resolution
CMX
CDV
=
=
P
t
Δ
S
=
P
t
1/n • Pb •
α
*1
67108864
1/2 • 10 • 1000
=
67108864
5000
=
8388608
625
67108864 [pulse/rev]
Z
1
Z
2
1/n = Z
1
/Z
2
= 1/3
1/n
r = 160 [mm]
Servo motor encoder resolution
CMX
CDV
=
=
P
t
Δ
S
=
P
t
1/n • r •
π
•
α
*1
67108864
1/3 • 160 •
π
• 1000
=
67108864
167551.61
524288
1309
≈