MITSUBISHI ELECTRIC MR-J2S- A - Manual (Page 149)

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5. PARAMETERS
5.2 Detailed description
5.2.1 Electronic gear
CAUTION Wrong setting can lead to unexpected fast rotation, causing injury.
POINT
The guideline of the electronic gear setting range is
50
1
CDV
CMX
500.
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.
Always set the electronic gear with servo off state to prevent unexpected
operation due to improper setting.
(1) Concept of electronic gear
The machine can be moved at any multiplication factor to input pulses.
CDV
CMX
Parameter No.4
Parameter No.3
Electronic gear
Feedback pulse
CMX
CDV Deviation
counter
Motor
Encoder
In
put p
u
ls
e tr
ai
n
The following setting examples are used to explain how to calculate the electronic gear.
POINT
The following specification symbols are required to calculate the electronic
gear
Pb : Ball screw lead [mm]
n
: Reduction ratio
Pt : Servo motor resolution [pulses/rev]
0 : Travel per command pulse [mm/pulse]
S : Travel per servo motor revolution [mm/rev]
: Angle per pulse [ /pulse]
: Angle per revolution [ /rev]
(a) For motion in increments of 10 m per pulse
Machine specifications
Ball screw lead Pb 10 [mm]
Reduction ratio: n 1/2
Servo motor resolution: Pt 131072 [pulses/rev]
Servo motor
131072 [pulse/rev]
n
NM
NL
Pb 10[mm]
n NL/NM
1/2
CDV
CMX
0
Pt
S
0
Pt
n Pb
10 10
3
1/2 10
131072 262144
1000
32768
125
Hence, set 32768 to CMX and 125 to CDV.