153
CHAPTER 8 FUNCTIONS
8
8.14 R
otation Speed Measureme
nt Function
●
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" (
Page 92, Section 8.1.1), the rotation speed (r/min) is calculated based on the count value per unit of
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.
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).
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.
Ex.
When the number for CH
Moving average count (Rotation speed measurement) (RWw19, RWw31) is
set to 3
Unit of time
Required pulse speed (minimum)
1s
1pps
0.1s
10pps
0.01s
100pps
Setting item
Setting range
Reference
CH
Moving average count (Rotation speed measurement)
(RWw19, RWw31)
1 to 100
(When 1 is set, the operation is performed
with the moving average count regarded as
not being done.)
CH Count enable command
(RY24, RY3C)
10000
T
T
T
T
1)
2)
3)
4)
5)
T
5000
Rotation speed
0
Time
T: Time unit
1st storage
1st storage = 1)+2)+3)/3 = (5000+7000+8000)/3 6667
2nd storage = 2)+3)+4)/3 = (7000+8000+8000)/3 7667
3rd storage = 3)+4)+5)/3 = (8000+8000+4000)/3 6667
Remote register
CH Measured rotation
speed value
(RWr1A to RWr1B,
RWr32 to RWr33)
2nd storage
3rd storage
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