Setting Example - Mitsubishi Electric Melservo-Jet MR-JET-G Series 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])
([Obj. 6091h: 01h]/[Obj. 6091h: 02h])
Travel distance
[Command unit]
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]
3 BASIC FUNCTION
78
3.6 Electronic gear function
or
+
CMX
Deviation counter
CDV -
Servo motor
M
Encoder