C-8
3.3
Operation of the VF-P7 [2]
PID control function of VF-P7 enables process control such as wind regulation or flux regulation,
pressure regulation. Operation permission / prohibition
3.3.1 The outline of PID control
The outline block diagram of PID control becomes like the following figure.
Note) Jump frequency function is performed to either of the following.
①
Process amount
②
Output frequency (Motor speed)
Set up with parameter
for your application.
Block diagram of PID control system becomes like the following.
Over-ride
process
Jump frequency
process #1
(Process value)
Run frequency
process
An example of deviation
/
Delay filter
Feedback amount
＋
−
PID deviation
upper limit
PID deviation
lower limit
Integral gain
Proportional gain
Differential gain
＋
＋
＋
Output
frequency
Reference of
process amount
Permission or
prohibition of
operation
/
Acceleration/
deceleration
process
Jump frequency
process #1
(Output frequency)
＋
−
PID controller
Fan, pump
and so on.
VF-P7
Reference of
process amount
Feedback amount
Output
frequency
Process amount
