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Course Description Introduces types of electric motor control, reduced voltage starting, and applications. Emphasis will be placed on motor types, controller types, and applications. Includes information on wye and delta motor connections; part wind, autotransformer; adjustable frequency drives and other applications; and oscilloscopes and their operation. Topics include: motor controls, types of reduced voltage starting, reduced voltage motor connections, adjustable frequency drive, and oscilloscope operations. | Competency Areas | Hours | | Motor Controls | Class | 2 | | Types of Reduced Voltage Starting | D. Lab | 0 | | Reduced Voltage Motor Connections | P. Lab/O.B.I. | 3 | | Adjustable Frequency Drive | Credit | 3 | | Oscilloscope Operations | | |
| Prerequisite: | | | Corequisite: | ELT 111 | Course Guide | Competency | After completing this section, the student will: | | Types of Reduced Voltage Starting | | Primary resistance starters | Diagram the primary resistance starter and motor connections and wiring. | | Auto-transformer starters | Diagram the auto-transformer starter and motor connections and wiring. | | Wye-delta starters | Diagram the wye-delta starter and motor connections and wiring. | | Solid state starters | Diagram the solid state starter and motor connections and wiring. | | Reduced Voltage Motor Connections | | Primary resistance starters | Install and operate a primary resistance controller and connected motor. | | Auto-transformer starters | Install and operate an auto-transformer controller and connected motor. | | Wye-delta starters | Install and operate a wye-delta controller and connected motor. | | Solid state starter | Install and operate a solid state controller and connected motor. | | Adjustable Frequency Drive | | Power supply | Describe the use of an adjustable speed activator with an induction motor.
Describe the use of frequency connectors with an induction motor.
Describe the applications of a speed regulator and volts per cycle regulator. | | Speed control | Describe how the Leblanc, Karmer, and Scherbius systems or speed control feed rotor power back in the line or provide additional motor torque. | | Modified frequency | Use the formula: F=Required Rev.Min x No. of poles to obtain modified frequency. |
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