User`s manual

150
4.14 Rotation Speed Measurement Function
The rotation speed measurement function is the function that counts the pulses of the pulse input terminals in phase A
and B, and automatically calculates the rotation speed.
(1) Setting for the rotation speed measurement function
To use the rotation speed measurement function, select "Rotation Speed Measurement Mode" in the "Operation
mode setting" in the switch setting.
(2) Calculation of the rotation speed
The rotation speed measurement function calculates the rotation speed from the following formula:
• Rotation speed(r/min) = (60 × Count value per a unit of time) (A unit of time × The number of pulses per
rotation)
So when the count value per a unit of time is 0, the rotation speed becomes 0(r/min).
Also the value of the rotation speed becomes negative at subtraction count.
(3) Setting of the unit of time for rotation speed measurement, and the number of
pulses per rotation
Set a unit of time to CH1 Time unit setting (rotation speed measurement) (Un\G1150).
Set the number of pulses per rotation to CH1 Number of pulses per rotation (Un\G1152, Un\G1153).
● Whichever mode ("1-Phase Multiple of 2", "2-Phase Multiple of 2", or "2-Phase Multiple of 4") is set in "Pulse input mode"
in the switch setting, the rotation speed (r/min) is calculated based on the count value per a unit of time.
● When the count value per a unit of time is 0, the rotation speed becomes 0(r/min).
Also the value of the rotation speed becomes negative at subtraction count.
Setting item Setting contents Reference
CH1 Time unit setting (rotation speed measurement)
(Un\G1150)
Select a unit of time for rotation speed
measurement from 0.01s, 0.1s, or 1s, and set it.
Page 81, Section 3.4.2 (47)
CH1 Number of pulses per rotation (Un\G1152,
Un\G1153)
Set the number of pulses per rotation in the range of
1 to 8000000.
Page 82, Section 3.4.2 (49)
QD65PD2
Rotation speed
measurement
Encoder
CH1 Measured rotation speed value
(Un\G1182, Un\G1183)
Buffer memory
Pulses