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D
PID Control Applications
The following table shows examples of PID control applications using the Inverter.
Application
Control contents
Sensors used
(example)
Speed control
Speeds are matched to target values as speed
information in a mechanical system.
Speed information for another mechanical system is
input as target values, and synchronized control is
executed by feeding back actual speeds.
Tacho-generator
Pressure control
Pressure information is returned as feedback for
stable pressure control.
Pressure sensor
Flow control
Flow information is returned as feedback for accurate
flow control.
Flow sensor
Temperature control
Temperature information is returned as feedback to
control temperature by turning a fan.
Thermocouple
Thermistor
D
PID Control Operations
In order to distinguish the separate PID control operations (i.e., proportional, integral, and derivative),
the following diagram shows the changes in the control input (i.e., the output frequency) when the devi-
ation between the target value and the feedback is held constant.
Deviation
Control input
D control
Time
PID control
I control
P control
Time
•
P Control
A control input proportional to the deviation is output. The deviation cannot be zeroed by P control
alone.
•
I Control
A control input which is an integral of the deviation is output. This is effective for matching the feedback
to the target value. Sudden changes, however, cannot be followed.
•
D Control
A control input which is an integral of the deviation is output. Quick response to sudden changes is
possible.
•
PID Control
Optimum control is achieved by combining the best features of P, I, and D control.
D
Types of PID Control
Two types of PID control are possible with the 3G3FV: measured-value derivative PID control and basic
PID control. The type that is normally used is measured-value derivative PID control.
Advanced Operation
Chapter 6
Содержание SYSDRIVE 3G3FV
Страница 1: ...USER S MANUAL High function General purpose Inverter SYSDRIVE 3G3FV Cat No I516 E1 4 ...
Страница 16: ...Chapter 1 Introduction 1 1 Function 1 2 Nomenclature 1 3 New Functions 1 ...
Страница 33: ...Chapter 2 Installation 2 1 Mounting 2 2 Wiring 2 ...
Страница 112: ...Chapter 4 Trial Operation 4 1 Procedure 4 2 Operation Example 4 ...
Страница 289: ...Chapter 7 Parameter Lists 7 1 Initialize Mode Parameters 7 2 Program Mode Parameter List 7 ...
Страница 366: ...Chapter 9 Specifications 9 1 Inverter Specifications 9 2 Option Specifications 9 ...
Страница 395: ...Chapter 10 Appendix 10 1 Notes on Using the Inverter for a Motor 10 ...