Instrumentation and Control – Modul 7 – Process Controls

TABLE OF CONTENTS

LIST OF FIGURES

PRINCIPLES OF CONTROL SYSTEMS
Automatic Control System
Functions of Automatic Control
Elements of Automatic Control
Feedback Control

CONTROL LOOP DIAGRAMS
Feedback Control System Block Diagram
Process Time Lags
Stability of Automatic Control Systems

TWO POSITION CONTROL SYSTEMS
Controllers
Two Position Controller
Example of Two Position Control
Modes of Automatic Control

PROPORTIONAL CONTROL SYSTEMS
Control Mode
Proportional Band
Example of a Proportional Process Control System

RESET (INTEGRAL) CONTROL SYSTEMS
Reset Control (Integral)
Definition of Integral Control
Example of an Integral Flow Control System
Properties of Integral Control

PROPORTIONAL PLUS RESET CONTROL SYSTEMS
Proportional Plus Reset
Example of Proportional Plus Reset Control
Reset Windup

PROPORTIONAL PLUS RATE CONTROL SYSTEMS
Proportional-Derivative
Definition of Derivative Control
Example of Proportional Plus Rate Control
Applications

PROPORTIONAL-INTEGRAL-DERIVATIVE CONTROL SYSTEMS
Proportional-Integral-Derivative
Proportional Plus Reset Plus Rate Controller Actions

CONTROLLERS
Control Stations
Self-Balancing Control Stations

VALVE ACTUATORS
Pneumatic Actuators
Hydraulic Actuators
Electric Solenoid Actuators
Electric Motor Actuators

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