Industrial Motor Control: Contents and Intro

Contents:

["Contents and Intro" -- this page]

1. General Principles of Motor Control
2. Symbols and Schematic Diagrams
3. Manual Starters
4. Overload Relays
5. Relays, Contactors, and Motor Starters
6. The Control Transformer
7. Timing Relays
8. Pressure Switches and Sensors
9. Float Switches
10. Flow Switches and Sensors
11. Limit Switches
12. Phase Failure Relays
13. Solenoid and Motor Operated Valves
14. Temperature Sensing Devices
15. Hall Effect Sensors
16. Proximity Detectors
17. Photodetectors
18. Basic Control Circuits
19. Schematics and Wiring Diagrams (Circuit #1 )
20. Timed Starting for Three Motors (Circuit #2)
21. Float Switch Control of a Pump and Pilot Lights (Circuit #3)
22. Developing a Wiring Diagram (Circuit #1)
23. Developing a Wiring Diagram (Circuit #2)
24. Developing a Wiring Diagram (Circuit #3)
25. Reading Large Schematic Diagrams
26. Installing Control Systems
27. Hand-Off-Automatic Controls
28. Multiple Push-Button Stations
29. Forward-Reverse Control
30. Jogging / Inching
31. Sequence Control
32. DC Motors
33. Starting Methods for DC Motors
34. Solid-State DC Drives
35. Stepping Motors
36. The Motor and Starting Methods
37. Resistor & Reactor Starting for AC Motors
38. Autotransformer Starting
39. Wye-Delta Starting
40. Part Winding Starters
41. Consequent Pole Motors
42. Variable Voltage and Magnetic Clutches
43. Braking
44. Wound Rotor Induction Motors
45. Synchronous Motors
46. Variable Frequency Control
47. Motor Installation
48. Developing Industrial Motor-Control Circuits
49. Industrial Motor Troubleshooting
50. Industrial Motors and Digital Logic
51. The Bounceless Switch
52. Start-Stop Push-Button Control
53. Programmable Logic Controllers (PLC)
54. Programming a PLC
55. Analog Sensing for (PLC) Programmable Controllers
56. Semiconductors
57. The PN Junction
58. The Zener Diode
59. The Transistor
60. The Unijunction Transistor
61. The SCR
62. The Diac
63. The Triac
64. The 555 Timer
65. The Operational Amplfier

[Appenidx]

[Glossary]

Introduction

The amount of knowledge an electrician must possess to be able to install and troubleshoot control systems in today's industry has increased dramatically in recent years. A continuous influx of improved control components allows engineers and electricians to design and install even more sophisticated and complex control systems. Industrial Motor Control presents the solid-state devices common in an industrial environment. This is intended to help the Learner understand how many of the control components operate, such as solid-state relays, rectifiers, SCR drives for direct current motors, vari able frequency drives for alternating current motors, and the inputs and outputs of programmable controllers. Although most electricians do not troubleshoot circuits on a component level, a basic knowledge of how these electronic devices operate is necessary in understanding how various control components perform their functions.

The influx of programmable logic controllers into industry has bridged the gap between the responsibilities of the electrician and the instrumentation technician. Many industries now insist that electricians and instrumentation technicians be cross-trained so they can work more closely together. Industrial Motor Control helps fulfill this requirement. Many of the common control devices found throughout industry are also discussed from a basic instrumentation standpoint by providing information on analog sensing of pressure, flow, temperature, and liquid level.

The section on motor installation has been updated to reflect changes in the 2014 National Electrical Code, and a unit that instructs Learners in basic troubleshooting techniques has been included. The sections have been rearranged to present the information in a different order. This rearrangement was done to reflect recommendations made by instructors that use the text.

Industrial Motor Control presents many examples of control logic and gives the Learner step by-step instructions on how these circuits operate.

There are examples of how ladder diagrams can be converted into wiring diagrams. This is the basis for understanding how to connect control circuits in the field. The concept of how motor control schematics are numbered is thoroughly discussed. Learners are also given a set of conditions that a circuit must meet, and then that circuit is developed in a step-by-step procedure. Learning to design control circuits is a very effective means of learning how circuit logic works. It is impossible to effectively troubleshoot a control circuit if you don't under stand the logic of what the circuit is intended to do.

Industrial Motor Control is based on the results of extensive research into content, organization, and effective learning styles. Short sections help the Learner to completely understand the content before progressing to the next subject, and they permit the instructor to choose the order of presentation. Each section contains extensive illustrations, which have been designed for maxi mum learning. Color is used to help the Learner understand exactly what is being conveyed in a particular illustration.

Content Highlights

•The most commonly used solid-state devices are thoroughly described, in terms of both operation and typical application.

• Information on analog devices that sense pressure, flow, and temperature has been added to help bridge the gap between the industrial electrician and the instrumentation technician.

•DC and AC motor theory is included so Learners will understand the effects of control circuits on motor characteristics.

•The Guide covers the operating characteristics of stepping motors when connected to either DC or AC voltage.

•Detailed instructions are given for connecting motors in the field, including the size of conductors, overload relays, and fuses or circuit breakers. All calculations are taken from the National Electrical Code.

•The principles of digital logic are described in sufficient detail for Learners to understand programmable controllers and prepare basic programs.

•A step-by-step testing procedure for electronic components is provided.

• Starting methods for hermetically sealed single-phase motors include the hot-wire relay, solid-state starting relay, current relay, and potential relay.

•Extensive coverage on overload relays and methods of protecting large horsepower motors is provided.

•There is extensive coverage of variable frequency drives.

•Solid-state control devices, in addition to electromagnetic devices, are thoroughly covered.

•Basic electronics is not a prerequisite for this Guide. Sufficient solid-state theory is presented to enable the Learner to understand and apply the concepts discussed.