Individual Functions
6-
117
K
K
K
K
Using
PID
Control
PID
control is a method of making the feedback value (detection value) match the set target value. By combin-
ing
proportional control (P), integral control (I), and derivative control (D), you can even control targets
(machinery)
with play time.
The
characteristics of the PID control operations are given below.
n
PID
Control
Operation
To
understand the differences between each PID control operation (P, I, and D, the variation in the amount of
operation
(output frequency) is as shown in the following diagram when the deviation (i.e., the difference
between
the target value and feedback value) is fixed.
Fig 6.75 PID Control Operation
n
PID
Control
Applications
The
following table shows examples of PID control applications using the Inverter.
P
control
Outputs
the amount of operation proportional to the deviation. You cannot, however, set the
deviation
to zero using P control alone.
I
control
Outputs
the amount of operation that integrates the deviation. Used for matching feedback
value
to the target value. I control is not suited, however, to rapid variations.
D
control
Outputs
the amount of operation derived from the deviation. Can respond promptly to rapid
variations.
Application
Control
Details
Example
of
Sensor
Used
Speed
Con-
trol
• Feeds
back machinery speed information, and matches speed to the target value.
• Inputs
speed information from other machinery as the target value, and performs
synchronous
control using the actual speed feedback.
Tachometer
genera-
tor
Pressure
Control
Feeds
back pressure information, and performs constant pressure control.
Pressure
sensor
Flow
Rate
Control
Feeds
back flow rate information, and controls the flow rate highly accurately.
Flow
rate sensor
Tempera-
ture
Con-
trol
Feeds
back temperature information, and performs temperature adjustment control
by
rotating the fan.
• Thermocouple
• Thermistor
Deviation
I control
Amount of operation
D control
Time
PID control
Time
P control
Summary of Contents for SYSDRIVE 3G3RV
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