Rotation Speed Measurement Function - Mitsubishi Electric NZ2GFCF-D62PD2 User Manual

8.17

Rotation Speed Measurement Function

The rotation speed measurement function counts the pulses of the pulse input terminals in phase A and B, and
automatically calculates the rotation speed.
Encoder
(1) Restrictions
During operation in the synchronous communication mode, the rotation speed measurement function cannot be
used. Set "CH Operation mode setting" to "0: Normal Mode".
(2) Setting method of the rotation speed measurement function
1.
Set "Parameter write" for "Method selection".
"CC IE Field Configuration" window  Select a high-speed counter module in "List of stations". 
[CC IE Field Configuration]  [Online]  [Parameter Processing of Slave Station]
2.
Set "CH Operation mode setting " to "2: Rotation Speed Measurement Mode".
(3) 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 unit of time)  (Unit of time
*2
rotation
*1 Select a unit of time from 0.01s, 0.1s, or 1s.
*2 Set the number of pulses per rotation in the range of 1 to 8000000.
Therefore, when the count value per unit of time is 0, the rotation speed is 0(r/min).
At subtraction count, the value of the rotation speed is negative.
(4) Setting of the unit of time for rotation speed measurement and the number of
pulses per rotation
Set a unit of time to CH Time unit setting (Rotation speed measurement) (RWw18, RWw30).
Set the number of pulses per rotation to CH Number of pulses per rotation (RWw1A to RWw1B, RWw32 to
RWw33).
Setting item
CH Time unit setting (Rotation speed measurement)
(RWw18, RWw30)
CH Number of pulses per rotation (RWw1A to RWw1B,
RWw32 to RWw33)
166
Pulses
)
High-speed
counter module
Rotation
speed
CH
measurement
(RWr1A to RWr1B, RWr32 to RWr33)
Setting range
0: 0.01s
1: 0.1s
2: 1s
1 to 8000000
Remote register
Measured rotation speed value
*1
 Number of pulses per
Reference
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