Mitsubishi Electronics J2-JRSERIES MR-J2-03A5 User Manual
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5. PARAMETERS
5.2 Detailed Description
5.2.1
Electronic gear
POINT
•
The guideline of the electronic gear setting range is
1
50
<
CMX
CDV ＜ 50. If the
set value is outside this range, noise may be generated during
acceleration/deceleration or operation may not be performed at the preset
speed and/or acceleration/deceleration time constants.
acceleration/deceleration or operation may not be performed at the preset
speed and/or acceleration/deceleration time constants.
(1) Concept of electronic gear
The machine can be moved at any multiplication factor to input pulses.
CDV
CMX
=
4
No.
Parameter
3
No.
Parameter
Electronic gear
Parameters No. 3, 4
Parameters No. 3, 4
Encoder feedback pulse
CMX
CDV
CDV
Deviation
counter
counter
Motor
Encoder
Inpu
t pu
ls
e tr
ai
n
+
−
−
The following setting examples are used to explain how to calculate the electronic gear:
(a) For motion in increments of 10
µ
m per pulse
Machine specifications
Ballscrew lead Pb =10 [mm]
Reduction ratio: n = 1/2
Servo motor resolution: Pt = 8192 [pulses/rev]
Reduction ratio: n = 1/2
Servo motor resolution: Pt = 8192 [pulses/rev]
Servo motor
8192 [pulse/rev]
8192 [pulse/rev]
n
NM
NL
Pb=10[mm]
n=NL/NM
=1/2
=1/2
CDV
CMX
=
∆
l
ο
x
S
Pt
∆
=
∆
l
ο
x
=
Pb
n
Pt
⋅
10
×
10
-3
x
10
2
1
8192
⋅
=
1000
16384
=
125
2048
Hence, set 2048 to CMX and 125 to CDV.
(b) Conveyor setting example
For rotation in increments of 0.01
°
per pulse
Machine specifications
Table resolution: 36000 pulses/rev
Reduction ratio: n = 4/64
Servo motor resolution: Pt = 8192 [pulses/rev]
Reduction ratio: n = 4/64
Servo motor resolution: Pt = 8192 [pulses/rev]
Table
Timing belt : 4/64
Servo motor
8192 [pulse/rev]
8192 [pulse/rev]
CDV
CMX
=
S
Pt
∆
=
64
4
36000
Pt
×
=
36000
131072
=
1125
4096
Reduce CDV to 32767 or less and round off the result to the units.
Hence, set 4096 to CMX and 1125 to CDV.
Hence, set 4096 to CMX and 1125 to CDV.