Mitsubishi Electric MELSERVO MR-J4-03A6-RJ, Инструкция по эксплуатации

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7. PARAMETERS
7 - 93
7.3 How to set the electronic gear
7.3.1 Electronic gear settings in the point table method and program method
(1) Setting [mm], [inch], or [pulse] with "Position data unit" of [Pr. PT01].
Adjust [Pr. PA06] and [Pr. PA07] so that the servo motor setting matches with the travel distance of the
machine.
CDV
Travel distance
"0" (initial value) CMX
CDV
CMX
Deviation counter
+
-
Electronic gear
([Pr. PA06]/[Pr. PA07])
Servo motor
Encoder
M
X32
X16
"2"
CDV
CMX
"3"
Electronic gear selection
(x _ _ _ ) ([Pr. PA21]) (Note)
Note. For MR-J4-03A6-RJ servo amplifiers, "2 _ _ _" or "3 _ _ _" cannot be set to [Pr. PA21].
P
t
: Servo motor encoder resolution: 4194304 [pulse/rev]
∆
S: Travel distance per servo motor revolution [mm/rev]/[inch/rev]/[pulse/rev]
CMX/CDV = P
t
/
∆
S
Set the electronic gear within the following range. Setting out of the range will trigger [AL. 37 Parameter
error].
Pr. PA21 Electronic gear setting range
0 _ _ _ 1/865 < CMX/CDV < 271471
2 _ _ _ 1/13825 < CMX/CDV < 16967
3 _ _ _ 1/27649 < CMX/CDV < 8484
The following setting example explains how to calculate the electronic gear.
POINT
To calculate the electronic gear, the following specification 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]
(a) Setting example of a ball screw
Machine specifications
Ball screw lead Pb = 10 [mm]
Reduction ratio: 1/n = Z
1
/Z
2
= 1/2
Z
1
: Number of gear teeth on servo motor side
Z
2
: Number of gear teeth on load gear
Servo motor encoder resolution
4194304 [pulse/rev]
Pb = 10 [mm]
Z
1
1/n = Z
1
/Z
2
= 1/2
Z
2
1/n
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