Mitsubishi NZ2GFCF-D62PD2 User Manual page 157

No.
The following processing is performed when CH Count enable command (RY24, RY3C) is turned on to turn CH Rotation speed
measurement flag (RWr20.b5, RWr38.b5) to Operating (1).
• The values of CH Time unit setting (Rotation speed measurement) (RWw18, RWw30), CH Moving average count (Rotation
1) speed measurement) (RWw19, RWw31), and CH Number of pulses per rotation (RWw1A to RWw1B, RWw32 to RWw33) are
acquired. (If the value is changed during the rotation speed measurement, the change is ignored.)
• CH Update flag (Measured rotation speed value) (RX2D, RX45) turns off.
• The value in CH Measured rotation speed value (RWr1A to RWr1B, RWr32 to RWr33) is cleared to 0.
CH Update flag (Measured rotation speed value) (RX2D, RX45) turns on when a value is stored in CH Measured rotation speed
2)
value (RWr1A to RWr1B, RWr32 to RWr33).
When CH Update flag reset command (Measured rotation speed value) (RY2C, RY44) is turned off then on, the high-speed
counter module turns off CH Update flag (Measured rotation speed value) (RX2D, RX45) and turns on CH Update flag reset
3) completed (Measured rotation speed value) (RX2C, RX44).
After that, CH Update flag reset completed (Measured rotation speed value) (RX2C, RX44) turns off when CH Update flag reset
command (Measured rotation speed value) (RY2C, RY44) is turned off.
CH Measured rotation speed value (RWr1A to RWr1B, RWr32 to RWr33) is updated even when CH Update flag (Measured
4)
rotation speed value) (RX2D, RX45) is on.
CH Rotation speed measurement flag (RWr20.b5, RWr38.b5) changes to Not operating (0) when CH Count enable command
5)
(RY24, RY3C) is turned off.
● After the start of the rotation speed measurement, CH Update flag (Measured rotation speed value) (RX2D, RX45)
turns on every time the measured value is stored in CH Measured rotation speed value (RWr1A to RWr1B, RWr32 to
RWr33).
The value previously stored in the remote register is held while CH Update flag (Measured rotation speed value)
(RX2D, RX45) is off. (Except at the start of the measurement)
● The margin of error (maximum) of the rotation speed measurement function is calculated from the following formula.
Actual rotation speed (r/min)
The following table shows each value to be put into the formula.
Ex.
Actual rotation speed (r/min)
Time unit (Rotation speed measurement) (s)
Moving average count (Rotation speed measurement)
Number of pulses per rotation
The margin of error (maximum) is calculated as shown below.
● CH Measured rotation speed value (RWr1A to RWr1B, RWr32 to RWr33) is updated without resetting CH Update flag
(Measured rotation speed value) (RX2D, RX45).
● CH Update flag reset command (Measured rotation speed value) (RY2C, RY44) responds within ΔT
For ΔT
, refer to the following.
1
• Internal Control Cycle and Response Delay Time (
Description
100 (ppm)
+
1000000
(Rotation speed measurement) (S)
Item
100 (ppm)
1234 (r/min)
1000000
= 0.1234 (r/min) + 25 (r/min)
= 25.1234 (r/min)
60
Time unit Moving average count
(Rotation speed measurement)
60
+
0.01 (s) 4 60
Page 283, Appendix 4)
CHAPTER 8 FUNCTIONS
Number of pulses
per rotation
Value
1234r/min
0.01s
4 times
60
after the action.
1
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8