Detailed Description; Electronic Gear - Mitsubishi Electric Melservo-J2-JR SERIES Instruction Manual

5. PARAMETERS

5.2 Detailed Description

5.2.1

Electronic gear

(1) Concept of electronic gear
The machine can be moved at any multiplication factor to input pulses.
CMX
=
CDV
The following setting examples are used to explain how to calculate the electronic gear:
(a) For motion in increments of 10 m per pulse
Machine specifications
Ballscrew lead Pb =10 [mm]
Reduction ratio: n = 1/2
Servo motor resolution: Pt = 8192 [pulses/rev]
CMX
l
CDV
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]
CMX Pt
CDV S
Reduce CDV to 32767 or less and round off the result to the units.
Hence, set 4096 to CMX and 1125 to CDV.
POINT
The guideline of the electronic gear setting range is
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.
Parameter No. 3
Parameter No. 4
Pt
Pt
10 10
l
S n Pb
Pt
131072
36000 4 64 36000
CMX
CDV
Encoder feedback pulse
Electronic gear
Parameters No. 3, 4
n=NL/NM
=1/2 NL
Servo motor
8192 [pulse/rev]
8192
16384
-3
1 2 10 1000
Servo motor
8192 [pulse/rev]
Timing belt : 4/64
4096
1125
5 - 18
1 CMX
50 CDV
Motor
Deviation
counter
Encoder
n
Pb=10[mm]
NM
2048
125
Table
50. If the