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Mitsubishi Electric RD77MS2 User Manual Page 42

Melsec iq-r simple motion module.
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■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 [pulse/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
[Pr.321]
Synchronous encoder axis unit
setting
[Pr.322] Synchronous encoder axis unit conversion: Numerator
[Pr.323] Synchronous encoder axis unit conversion: Denominator
[Pr.324] Synchronous encoder axis length per cycle
Synchronous encoder
input pulse
[Pr.322], [Pr.323]
Synchronous encoder
axis unit conversion
[Md.320] Synchronous
encoder axis
current value
[Md.321] Synchronous
encoder axis
current value
per cycle
[Md.322] Synchronous
encoder axis speed
(Speed after unit
conversion)
[Pr.325] Synchronous encoder axis smoothing time constant
Set the averaging time to execute a smoothing process for the input movement amount from synchronous encoder.
The smoothing process can moderate speed fluctuation of the synchronous encoder input.
The input response is delayed depending on the time corresponding to the setting by smoothing process setting.
Input value speed
before smoothing
Input value speed
after smoothing
[Pr.325] Synchronous encoder axis
smoothing time constant
2 INPUT AXIS MODULE
2.2 Synchronous Encoder Axis
Control unit
Number of decimal places for position
Speed time unit
Number of decimal places for speed
[pulse]
40000
20000
[ × 0.1 degree]
7200
3600
[ × 0.1 degree]
[Pr.324] Synchronous encoder axis length per cycle
3600
[ × 0.001 degree/min]
Averaging by
smoothing time constant
Setting details
2: degree
1
1: minute [min]
3
360.0 [degree]  1
4000 [pulse]  5
360.0 [degree]
t
t
t
t
t
t
[Pr.325] Synchronous encoder axis
smoothing time constant
Setting value
3112H
3600 [  0.1 degree]
20000 [pulse]
3600 [  0.1 degree]

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