How To Set The Electronic Gear - Mitsubishi Electric MR-J4-_GF Instruction Manual

7. PARAMETERS

7.2.6 How to set the electronic gear

(1) Electronic gear settings in the point table method
Adjust [Pr. PA06] and [Pr. PA07] to match the servo amplifier setting with the travel distance of the
machine.
Electronic gear
([Pr. PA06] [Pr. PA07])
CMX
Travel distance
CDV
Pt: Servo motor encoder resolution: 4194304 [pulse/rev]
∆S: Travel distance per servo motor revolution [mm/rev]/[inch/rev]/[pulse/rev]
CMX/CDV = Pt/∆S
The following setting example shows how to calculate the electronic gear.
(a) Setting example of a ball screw
Machine specifications
Ball screw lead Pb = 10 [mm]
Reduction ratio: 1/n = Z
Z : Number of gear teeth on servo motor side
1
Z : Number of gear teeth on load side
2
Servo motor encoder resolution: P
CMX P
t
= =
ΔS
CDV
Note. Because the command unit is "mm", α is 1000. When the unit is "inch", α is 10000. When the unit is "pulse", α is 1.
Therefore, set CMX = 524288 and CDV = 625.
+
Deviation counter
-
POINT
To calculate the electronic gear, the following specifications are required.
Pb: Ball screw lead [mm]
1/n: Reduction ratio
Pt: Servo motor encoder resolution [pulse/rev]
∆S: Travel distance per servo motor revolution [mm/rev]
/Z = 1/2
1 2
= 4194304 [pulse/rev]
t
P 4194304
t
=
n Pb α (Note)
1/2 10 1000
Servo motor
M
Encoder
1/n = Z /Z
1
Servo motor encoder resolution
4194304 [pulse/rev]
4194304
= =
5000
7 - 32
1/n
= 1/2
2
Z
2
Pb = 10 [mm]
Z
1
524288
625