Mitsubishi Electric MELSERVO-J5 User Manual page 137
Ac servo system
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Also See for MELSERVO-J5:
- User manual (478 pages) ,
- Sample screen manual (128 pages) ,
- Introduction manual (112 pages)
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For profile position mode
■When setting "3" (pulse) in [Pr. PT01.2 Unit for position data]
Adjust [Pr. PA06 Electronic gear numerator] and [Pr. PA07 Electronic gear denominator] so that the travel distance set in the
servo amplifier 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.
To calculate the electronic gear, the following specification symbols are required.
Pb: Ball screw lead [mm]
1/n: Reduction ratio
P
: Servo motor encoder resolution [pulse/rev]
t
ΔS: Travel distance per servo motor revolution [mm/rev]
Ex.
Setting example for a ball screw
Machine specifications
1/n
1/n = Z
/Z
= 1/2
1
2
Z
2
Z
1
Servo motor encoder resolution
67108864 [pulse/rev]
Ball screw lead Pb = 10 [mm]
Reduction ratio: 1/n = Z
/Z
= 1/2
1
2
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
P
67108864
t
t
=
=
=
*1
CDV
ΔS
1/n • Pb • α
1/2 • 10 • 1000
Therefore, set CMX = 8388608 and CDV = 625.
*1 When the command unit is "pulse", convert as α = 1.
Servo motor
+
Deviation counter
-
Pb = 10 [mm]
= 67108864 [pulse/rev]
t
67108864
8388608
=
=
5000
625
M
Encoder
3 BASIC FUNCTION
3.10 Electronic gear function [G]
3
135
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