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Gain the knowledge that industrial electricians in the field need in order to be successful! The subject of motor controls is one of the major areas of concern for industrial electricians, and this book prepares you for work in the industry. A "real-world" systems approach is applied to all aspects of motor control, including basic control circuits, sensing devices, solid-state controls, variable speed drives, programmable logic controllers (PLCs), and more. "Must know" applications, procedures, and operations are stressed throughout. Coverage concludes with a series of practical laboratory exercises to help provide an excellent knowledge base of important installation, testing, and troubleshooting procedures.
Features:
- Teaches readers how to recognize standard NEMA symbols and familiarizes them with important information on motor installation that is in accordance with the 2005 National Electrical Code.
- Clear explanations of the logic of control systems begins with very simple control circuits and progresses to more advanced circuits for organized learning.
- Covers the basic control components such as limit switches, flow switches, and pressure switches that readers are likely to encounter throughout their work in the industry.
- Introduces the basics of programmable logic controllers and how they operate, as well as how a standard relay control system can be converted for loading into a PLC.
From the Preface
A Note from the Author
I have taught the subject of motor control for over 30 years. I have tried different methods and found that some are more successful than others. Understanding Motor Controls is the accumulation of this knowledge. I am sure other methods may work equally well, but the methods and information presented in this textbook have worked the best for me. My goal in writing this textbook is to present the subject of motor control in a way that the average student can understand. I have three main objectives:
- Teach the student how to interpret the logic of a schematic diagram.
- Teach the student how to properly connect a circuit using a schematic diagram.
- Teach the student how to troubleshoot a control circuit.
Understanding Motor Controls assumes that the student has no knowledge of motor controls. The student is expected to have knowledge of basic Ohm's law and basic circuits, such as series, parallel and combination. The book begins with an overview of safety. A discussion of schematics (ladder diagrams) and wiring diagrams is presented early. The discussion of schematics and wiring diagrams is intended to help students understand the written language of motor controls. Standard NEMA symbols are discussed and employed throughout the book when possible. The operation of common control devices is presented to help students understand how these components function and how they are used in motor control circuits. Basic control circuits are presented in a manner that allows students to begin with simple circuit concepts and progress to more complicated circuits.
The textbook contains examples of how a schematic or ladder diagram is converted into a wiring diagram. A basic numbering system is explained and employed to aid students in making this conversion. This is the most effective method I have found of teaching a student how to make the transition from a circuit drawn on paper to properly connecting components in the field.
Understanding Motor Controls also covers solid-state controls for both DC and AC motors. Variable frequency drives and programmable logic controllers are covered in detail. I explain how to convert a ladder diagram into a program that can be loaded into a PLC. The book contains many troubleshooting problems that help the student understand the logic of a control system. Circuit design is also used to help the student develop the concepts of circuit logic.
Understanding Motor Controls contains 16 hands-on laboratory exercises that are designed to use off-the-shelf motor control components. A list of materials and suggested vendors is given for the components used in the exercises. The laboratory exercises begin with very basic concepts and connections and progress through more complicated circuits.
Contents
Preface. Safety. Section 1: Basic Control Circuits and Components. Chapter 1: General Principles of Motor Control. Chapter 2: Symbols and Schematic Diagrams. Chapter 3: Manual Starters.
Chapter 4: Overload Relays. Chapter 5: Relays, Contactors, and Motor Starters. Chapter 6: The Control Transformer. Section 2: Basic Control Circuits. Chapter 7: Start-Stop Pushbutton Control. Chapter 8: Multiple Pushbutton Stations. Chapter 9: Forward-Reverse Control. Chapter 10: Jogging and Inching. Chapter 11: Timing Relays. Chapter 12: Sequence Control. Section 3: Sensing Devices. Chapter 13: Pressure Switches and Sensors. Chapter 14: Float Switches and Liquid Level Sensors. Chapter 15: Flow Switches. Chapter 16: Limit Switches. Chapter 17: Temperature Sensing Devices. Chapter 18: Hall Effect Sensors. Chapter 19: Proximity Detectors. Chapter 20: Photodetectors. Chapter 21: Reading Large Schematic Diagrams. Chapter 22: Installing Control Systems. Section 4: Starting and Braking Methods. Chapter 23: Across-the-Line Starting. Chapter 24: Resistor and Reactor Starting for AC Motors. Chapter 25: Autotransformer Starting. Chapter 26: Wye-Delta Starting. Chapter 27: Part Winding Starting. Chapter 28: Direct Current Motors. Chapter 29: Single-Phase Motors. Chapter 30: Braking. Section 5: Wound Rotor, Synchronous and Consequent Pole Motors. Chapter 31: Wound Rotor Motors. Chapter 32: Synchronous Motors.
Chapter 33: Consequent Pole Motors. Section 6: Variable Speed Drives. Chapter 34: Variable Voltage and Magnetic Clutches. Chapter 35: Solid State DC Motor Controls. Chapter 36: Variable Frequency Control. Section 7: Motor Installation. Chapter 37: Motor Installation. Section 8: Programmable Logic Controllers. Chapter 38: Programmable Logic Controllers. Chapter 39: Programming a PLC. Chapter 40: Analog Sensing for Programmable Logic Controllers. Section 9: Developing Control Circuits and Troubleshooting. Chapter 41: Developing Control Circuits.
Chapter 42: Troubleshooting. Section 10: Laboratory Exercises. Appendix. Glossary. |
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