Mitsubishi Electric MELSERVO-JE, Instruction Manual

Page: 54 / 116

4. PARAMETERS
4 - 31
(a) Setting example of 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 side
Servo motor encoder resolution
131072 [pulse/rev]
Pb = 10 [mm]
Z
1
1/n = Z
1
/Z
2
= 1/2
Z
2
1/n
Servo motor encoder resolution: P
t
= 131072 [pulse/rev]
P
t
Δ S
P
t
131072
5
CMX
CDV =
= 1/n Pb
α (Note)
131072
= 1/2 10 1 =
Note. Because the command unit is "pulse", α is 1.
Therefore, set CMX = 131072 and CDV = 5.
(b) Setting example of a conveyor
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 side
Servo motor encoder resolution
131072 [pulse/rev]
Z
1
Z
2
1/n = Z
1
/Z
2
= 1/3
1/n
r = 160 [mm]
Servo motor encoder resolution: P
t
= 131072 [pulse/rev]
CMX
CDV
P
t =
Δ S
P
t = 1/n r
π α (Note)
131072
= 1/3 160
π 1
131072
= 167.6
16384
21
Note. Because the command unit is "pulse", α is 1.
Reduce CMX and CDV to within the setting range or lower and round off each value to the closest
whole number.
Therefore, set CMX = 16384 and CDV = 21.