Standard |
ELC 212 – Motor Controls
Introduces the
application of motor controls in the industrial environment. Topics include: AC/DC motors, AC/DC drives, MCC and contractors, NEC and NEMA
standards, ladder diagrams, and power sources.
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Competency Areas |
Hours
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AC/DC Motors |
Class |
4 |
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AC/DC Drives |
D. Lab |
6 |
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MCC and Contractors |
P. Lab/O.B.I. |
0 |
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NEC and NEMA Standards |
Credit |
7 |
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Ladder Diagrams Power Sources |
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Prerequisites/Corequisites: |
ELC 119, ELC 125 |
Course Guide |
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Competency |
After completing this
section, the student will: |
Hours |
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Class |
D.Lab |
P.Lab/ O.B.I. |
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AC/DC MOTORS |
10 |
18 |
0 |
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DC motors |
Describe the operation and construction of the following DC motors: (a) shunt, (b) series, (c) compound, and (d) PME. |
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AC motors |
Describe the operation and construction of the following AC motors: (a) induction, (b) series, and (c) synchronous. |
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4 |
4 |
0 |
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SCR drive |
Explain SCR drive principle of operation. |
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Variable frequency |
Explain variable principle of operation. |
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MCC AND CONTRACTORS |
11 |
20 |
0 |
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Manual controllers |
Describe manual controllers for AC motors. |
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Describe types of solid state controllers. |
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Explain the meaning of across the line starting. |
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Explain automatic starter operation. |
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Describe typical starting methods. |
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Describe automatic starters from DC control operation. |
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Describe methods to automatically start AC motors. |
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Describe how to change the direction of a DC motor. |
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Describe how to control the speed of a DC motor. |
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Describe methods of speed control for AC motors. |
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NEC AND NEMA STANDARDS |
3 |
2 |
0 |
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Demonstrate an understanding of NEC and NEMA standards. |
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List the sources for information on NEC and NEMA standards. |
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Recognize compliance with NEC and NEMA standards. |
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LADDER DIAGRAMS |
8 |
10 |
0 |
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Draw schematic symbols representing the major components used in industrial motor control circuits. |
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Draw a ladder diagram of a motor control circuit given a standard schematic drawing. |
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Wire a motor control circuit from a ladder diagram. |
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Explain a motor control circuit operation using a ladder diagram. |
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POWER SOURCES |
4 |
6 |
0 |
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Describe basic transformer theory. |
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Describe typical single-phase and three-phase power systems. |
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Draw and analyze a wye-to-delta and delta-to-wye phase power source. |
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Describe a three-phase AC to DC conversion system. |
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Suggested Resources |
Berutti, A. (Ed.). (1991). Practical
guide to motors and motor controls.
Overland Park, KS: Intertec.
Bryan, E. A., et al. (1995).
Troubleshooting and understanding electrical and motor controls:
Video guide and workbook. Atlanta:
Industrial Text Co.
Bryan, L. A., et al. (1995).
AC motor controls and troubleshooting: Video booklet/workbook. Atlanta: Industrial Text Co.
Bryan, L. A., et al. (1995).
DC motor controls and troubleshooting: Video booklet/workbook. Atlanta: Industrial Text Co.
Hartwell, F. P. (Ed.). (1996).
Understanding NE code rules on motors and motor controls. Overland Park, KS: Intertec.
Keljik.
(1995). Electric motors and
motor controls training. Albany,
NY: Delmar.
Miller, R., & Miller, M. R. (1991).
Electric motor controls.
Englewood Cliffs, NJ: Prentice Hall.
Tel-A-Train, Inc. Staff. (1991).
Maintaining and troubleshooting industrial motor controls. Chattanooga: Author.
Traister, J. (1994).
Complete handbook of electric motor controls. Englewood Cliffs, NJ: Prentice Hall.