How To Set The Electronic Gear - Mitsubishi Electric MELSERVO-MR-J4 GF Series Instruction Manual

How to set the electronic gear

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.
• To calculate the electronic gear, the following symbols 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]
■Setting example of a ball screw
Machine specifications
1/n
1/n = Z /Z = 1/2
1 2
Z
2
Servo motor encoder resolution
4194304 [pulse/rev]
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 gear
2
Servo motor encoder resolution: P
CMX P
t
= =
CDV ΔS
*1 Because the command unit is "mm",  = 1000 is set. When the unit is "inch",  is 10000. When the unit is "pulse",  is 1.
Therefore, set CMX = 524288 and CDV = 625.
7 PARAMETERS
200
7.2 Detailed list of parameters
+
Deviation counter
-
Pb = 10 [mm]
Z
1
/Z = 1/2
1 2
= 4194304 [pulse/rev]
t
P 4194304
t
=
*1
1/n • Pb • α 1/2 • 10 • 1000
Servo motor
M
Encoder
4194304 524288
= =
5000 625