Mitsubishi Electric MR-E A Series Instruction Manual page 110

5. PARAMETERS
5.2 Detailed description
5.2.1 Electronic gear
CAUTION
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The machine can be moved at any multiplication factor to input pulses.
The following setting examples are used to explain how to calculate the electronic gear:
(1) For motion in increments of 10 m per pulse
Machine specifications
Ballscrew lead Pb 10 [mm]
Reduction ratio: n
Servo motor resolution: Pt
CMX
CDV
Hence, set 20 to CMX and 1 to CDV.
Wrong setting can lead to unexpected fast rotation, causing injury.
POINT
The guideline of the electronic gear setting range is
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.
The following specification symbols are required to calculate the electronic
gear.
CMX Parameter No.3
CDV Parameter No.4
POINT
The following specification symbols are required to calculate the electronic
gear
Pb : Ballscrew lead [mm]
n : Reduction ratio
Pt : Servo motor resolution [pulses/rev]
: Travel per command pulse [mm/pulse]
0
S : Travel per servo motor revolution [mm/rev]
: Angle per pulse [ /pulse]
: Angle per revolution [ /rev]
1/2
10000 [pulses/rev]
Pt Pt
10 10
0 0
S n Pb
CMX
CDV
Electronic gear
n NL/NM
1/2
NL
Servo motor
10000 [pulse/rev]
10000 20000 20
3
1/2 10 1000
5 - 25
1 CMX
50 .
50 CDV
Motor
Deviation
counter
Feedback pulse
Encoder
n
Pb 10[mm]
NM
1