Mitsubishi Electric LD77MH, User Manual

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Chapter 2 Input Axis Module
[Pr.324] Synchronous encoder axis length per cycle
Set the length per cycle for the synchronous encoder axis current value per cycle.
The current value of synchronous encoder axis is stored in "[Md.321] Synchronous
encoder axis current value per cycle" at ring counter based on the setting value.
The unit settings are in synchronous encoder axis position units (Refer to Section 2.2.1).
Set a value within the range from 1 to 2147483647.
Example) Setting example of the unit conversion and the length per cycle.
The following shows an example a rotary encoder is connected which resolution is
4000[PLS/rev] to the motor axis side on the rotation table that drives by 1/5 pulley system,
and the control unit is degree.
• Position unit
: 0.1 [degree]
• Speed unit : 0.001 [degree/min]
• Length per cycle : 360.0 [degree] (1 cycle of the rotation table)
Setting item Setting details Setting value
[Pr.321]
Synchronous encoder
axis unit setting
Control unit 2: degree
3112h
Number of decimal places for position 1
Speed time unit 1: minute [min]
Number of decimal places for speed 3
[Pr.322] Synchronous encoder axis unit conversion: Numerator 360.0 [degree] 1 3600 [ 0.1degree]
[Pr.323] Synchronous encoder axis unit conversion: Denominator 4000 [PLS] 5 20000 [PLS]
[Pr.324]Synchronous encoder axis length per cycle 360.0 [degree] 3600 [ 0.1degree]
t
[PLS]
20000
40000
t
[ 0.1degree]
7200
3600
t
3600
[ 0.1degree]
t
[ 0.001degree/min]
Synchronous encoder axis
length per cycle Pr.324
Synchronous encoder axis
speed (Speed after unit
conversion) Md.322
Synchronous encoder axis
current value per cycle Md.321
Synchronous encoder
input pulse
Synchronous encoder axis
unit conversion
Pr.323 Pr.322 ,
Synchronous encoder axis
current value Md.320