Individual Functions
6
-
83
Using PI Control
PI control is a method of making the feedback value (detection value) match the set target value. By combin-
ing proportional control (P) and integral control (I), you can even control system with load fluctuation.
The characteristics of the PI control operations are given below.
PID Control Operation
To understand the differences between the PI control operations P and I the output share of each operation is
shown in the following diagram when the deviation (i.e., the difference between the target value and feedback
value) is fixed.
Fig 6.48 PI Control Operation
PI Control Applications
The following table shows examples of PI control applications using the Inverter.
P element
The output of a P-element is proportional to the input (deviation). With using a P-element
alone it is not possible to eliminate the deviation completely.
I element
The output of an I-element is the time-integral of the input (deviation). With using a P-ele-
ment and an I-element together the deviation can be eliminated completely.
Applica-
tion
Control Details
Example of Sen-
sor Used
Pressure
Control
Pressure information is fed back and constant pressure control is performed.
Pressure sensor
Flow Rate
Control
Flow rate information is fed back and the flow rate is controled with high accuracy.
Flow rate sensor
Tempera-
ture Con-
trol
Temperature information is fed back and a temperature adjustment control using a
fan can be performed.
• Thermocouple
• Thermistor
Deviation
Output of P- and
Time
PI control
I control
P control
Time
I-element
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