Mitsubishi NZ2GFCF-D62PD2 User Manual page 155

● Whichever mode ("1: 1-Phase Multiple of 2", "4: 2-Phase Multiple of 2", or "5: 2-Phase Multiple of 4") is set in "CH Pulse
input mode" (
time.
● Required pulse speed (minimum)
The rotation speed is calculated from the count value per unit of time. However, the pulse speed lower than the one in the
following table, the rotation speed cannot be measured correctly as the count value is in an integer number. Input the
pulses with the speed shown below or higher.
1s
0.1s
0.01s
When a unit of time is 0.01[s], the number of pulses per rotation is 60, and when the pulse input speed is 1234[pps], the
value of the calculated rotation speed is 1200(r/min) or 1300(r/min). By doing the moving average count, the fluctuation of
the measured values can be lowered.
(4) Moving average count
When the rotation speed measurement function is used, the fluctuation of the measured rotation speed can be
lowered by doing the moving average count.
Set the number of the moving average count is set to CH Moving average count (Rotation speed
measurement) (RWw19, RWw31).
Setting item
CH Moving average count (Rotation speed measurement)
(RWw19, RWw31)
After the specified number of counts are done, the average of the measured values of the rotation speed is stored
in CH Measured rotation speed value (RWr1A to RWr1B, RWr32 to RWr33) as shown below.
When the number for CH Moving average count (Rotation speed measurement) (RWw19, RWw31) is
Ex.
set to 3
CH Count enable command
Rotation speed
Page 92, Section 8.1.1), the rotation speed (r/min) is calculated based on the count value per unit of
Unit of time
1 to 100
(When 1 is set, the operation is performed
with the moving average count regarded as
not being done.)
(RY24, RY3C)
T T T T
10000
3)
2)
1)
5000
0
1st storage = 1)+2)+3)/3 = (5000+7000+8000)/3
2nd storage = 2)+3)+4)/3 = (7000+8000+8000)/3
3rd storage = 3)+4)+5)/3 = (8000+8000+4000)/3
Required pulse speed (minimum)
1pps
10pps
100pps
Setting range
T
4)
Remote register
5)
CH
1st storage
2nd storage
(RWr1A to RWr1B,
RWr32 to RWr33)
3rd storage
Time
T: Time unit
6667
7667
6667
CHAPTER 8 FUNCTIONS
Reference
Page 265, Appendix 2 (12)
Measured rotation
speed value
153
8