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.
For position control 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. When the value is converted with [Pr. PA05 Number of command input
pulses per revolution], the numerator of the electronic gear ratio is the encoder resolution, and the denominator is the setting
value in [Pr. PA05].
Electronic gear compatibility selection
([Pr. PA21.3])
"0"
"1"
Travel distance
[Command unit]
"2"
"3"
"4"
*1 With CM1 (Electronic gear selection 1) and CM2 (Electronic gear selection 2) of the input device, the setting value of CMX can be
selected from [Pr. PA06], [Pr. PC32], [Pr. PC33], or [Pr. PC34].
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]
Electronic gear
([Pr. PA06]/[Pr. PA07])
(initial value)
Pt
FBP
×256
Conversion using the number of command
input pulses per revolution
×512
×16
*1
CMX
CDV
+
Deviation counter
-
(Pt/[Pr. PA05])
Servo motor
M
Encoder
3 BASIC FUNCTION
3.12 Electronic gear function [A]
3
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