Setting Example - Mitsubishi Electric MELSERVO-J5 User Manual

Setting example

The electronic gears on the position command side are illustrated in the function block diagrams. The inverse
number of the electronic gear ratio is multiplied to the position feedback side.
In the cyclic synchronous position mode
Adjust [Pr. PA06 Electronic gear numerator] and [Pr. PA07 Electronic gear denominator] so that the travel distance set in the
controller matches the travel distance on the machine. [Motor revolutions (Obj. 6091h: 01h)] and [Shaft revolutions (Obj.
6091h: 02h)] can also be used for the setting.
Electronic gear
([Pr. PA06]/[Pr. PA07])
or
([Obj. 6091h: 01h]/[Obj. 6091h: 02h])
CMX
Travel distance
[Command unit]
CDV
P : Servo motor encoder resolution [pulse/rev]
t
ΔS: Travel distance per servo motor revolution [command unit/rev]
CMX: Electronic gear numerator
CDV: Electronic gear denominator
CMX/CDV = P /ΔS
t
The following setting example shows how to calculate the electronic gear.
The following specification symbols are necessary for calculation of the electronic gear.
Pb: Ball screw lead [mm]
1/n: Reduction ratio
P : Servo motor encoder resolution [pulse/rev]
t
ΔL : Travel distance per command pulse [mm/pulse]
0
ΔS: Travel distance per servo motor revolution [mm/rev]
Δθ°: Angle per pulse [°/pulse]
Δθ: Angle per revolution [°/rev]
Servo motor
+
Deviation counter
-
Encoder
M
3.10 Electronic gear function [G]
3 BASIC FUNCTION
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