Preface of Fundamentals Of Electrical Control 2nd Edition
During over 50 years working in the electrical industry, the author commissioned many industrial electrical control systems in the USA and overseas. This required training the local electricians so they could understand and service the complex installations. The most frequent question was, “Where can we find a book that teaches us how to understand electrical logic diagrams?”:
This book will give you the answers. It provides the generic train ing needed to help you analyze logic systems. It is a practical guide for electrical engineers, electricians, and full-time maintenance workers who are faced with real-life, on-the-job electrical control applications.
The material was first presented as a school to train professional elevator maintenance electricians working for VTS Inc, Seattle, WA, Each elevator manufacturer has his own unique control system, but all elevators still require equivalent control logic. This book deliberately uses non-elevator examples to provide objectivity. Older elevators use relay ladder logic, while the newer ones now use programmable controllers.
The books opens with a chapter which helps define logic, using abstract examples. We then define common components used to build logical systems. Simple logic and wiring diagrams in Chapter 3 illustrate where we are headed.
Chapters 4 through 9 take us on an adventure where we design a “sequencing” logic system around a fairly simple conveyor problem, develop the schematic diagram, make a bill of materials, and design component wiring diagrams. In Chapter 9 we go on site, and commission the installation, which includes some trouble shooting experience to find problems that occur during the start-up. This shows how schematies and wiring diagrams can best be used to quickly solve problems.
Fundamentals Of Electrical Control 2nd Edition PDF Download
Chapter 10 illustrates a case-history covering a positional” logic system, complete with typical schematic and wiring diagrams.
Chapter 11 discusses samples of several unique solutions to problems that require bailing circuits, sorting systems, and counting with relays. This includes encoding and decoding with relays, and a basic shift-register circuit.
Chapters 12 through 18 provide a generic introduction to programmable logic controllers (PLCs). The subject matter does not try to make one a programmer, but defines the general layout of PLCs, the numbering systems one may encounter, basic memory structure, sys. tem addressing, and the common instruction set. The equivalent ladder diagram is shown, followed by an example of a program that might be used for the problem we previously solved in Chapters 4 through 9.
Chapters 19 and 20 introduce the contrast between digital and analog control systems, including an overview of a DC motor, analog control system.
Chapter 21 recaps several interesting trouble-shooting experiences and concluding remarks.
An Addendum has been included in the 24 edition of Fundamentals of Electrical Control, containing a Chapter 22, entitled “Heat and Enclosures.” This is a related subject that must be considered if one is installing heat-producing, electronic equipment in controlled enclosures. Uncontrolled heat can create problems in any control system.
The appendices include a glossary, a summary of useful formulas, and an index.
Our intent is to familiarize the electrician with relay ladder logic, and then show him how to understand the transition to PLC logic for similar installations. An electrician or technician who understands logic will find that he becomes a far more valuable troubleshooter as he adds this expertise to his electrical experience.
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