Industrial Control Electronics by Michael Jacob

Contents

6-2

Single-Loop Digital Control 6 2 . 1 Digital Control Schemes 6-2.2 Initial Housekeeping 6-2.3 Data Input 6-2.4 Control Algorithms 6-2.5 Command Output 6-2.6 Modes of Operation 6-3 Programmable Controllers 6 3 . 1 Hardware Overview 6-3.2 Ladder Diagram Programming Summary Problems

7

POWER INTERFACES 7-1

7-2

7-3

8

Objectives Power Operational Amplifier Switch-Mode Servo Amplifiers 7-2.1 Principles of Pulse-Width Modulation 7-2.2 Switch-Mode Filter 7-2.3 Switching Diodes 7-2.4 Pulse-Width-Modulation IC 7-2.5 The Transistor Switch Thyristor-Based Power Interfaces 7-3.1 Thyristor Devices 7-3.2 Thyristor Triggers 7-3.3 Proportional Power Circuits Summary Problems

SYSTEM RESPONSE Objectives

8-1 System Transfer Functions 8-1.1 Process Control 8-1.2 Servo Control 8-2 Final Value Theorem 8-3 Stability: The Bod6 Plot 8-3.1 An Overview 8-3.2 Gain 8-3.3 Derivative 8-3.4 Integral 8-3.5 Lead 8-3.6 Lag 8-3.7 Second-Order Lag, Underdamped 8-3.8 Gain and Phase Margins