Jan 24, 2022  
2020-2021 Course Catalog 
    
2020-2021 Course Catalog [ARCHIVED CATALOG]

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ELT 131 - Motor Controls

Credits: 3
Lecture Hours: 2
Lab Hours: 2
Practicum Hours: 0
Work Experience: 0
Course Type: Voc/Tech
An introduction to industrial motor controls. During this course, students will use ladder diagrams and control devices to implement practical control systems.
Competencies
  1. Acquire safety awareness.
    1. Determine the correct fire extinguisher for class A, B or C fire.
    2. Determine the proper use of trade hand tools.
    3. Describe power tools and their use in the trade.
    4. Lockout/tag out procedures’
    5. 1.5 Describe safety precautions when working with HV wiring.
    6. 1.6 Wire circuits with power off.
    7. Run neutral only to loads or coils to protect students and circuit breakers.
  2. Identification and description of NEMA symbols.
    1. Use NEMA symbols in all circuits developed.
    2. Relate the symbols to the physical devices commonly used in motor control. 
  3. Understand motor control with aid of ladder/line diagrams.
    1. Fabricate two and three wire control circuits.
    2. Proper notation, descriptions, notation of ladder diagrams.
    3. Relate the three basic sections of a ladder diagram.
    4. Implement memory/latching circuits.
    5. Implement relay logic (AND/OR/NAND/NOR) circuits.
    6. Use interlocking and sequence control.
    7. Select proper parameters in solenoid applications.
    8. Describe shading coil induction motor, solenoids, contactors and coils.
    9. Describe arch suppression.
    10. Describe the advantages of joystick control.
  4. Design circuits using timers to facilitate applications.
    1. Draw timing charts.
    2. Use pneumatic timers.
    3. Use synchronous timers.
  5. Explain motor types, operation, and related topics.
    1. Induction and brush type.
    2. 5.2 Describe how the rotary magnetic field is developed.
    3. Describe the shunt, series and compound motors.
    4. Forward and reverse operation of three phase, single phase and brush type motors.
    5. Reduced current starting.
  6. Analyze power distribution systems and fundamentals.
    1. Delta.
    2. Wye.
    3. Discuss over current protection.
  7. Analyze the following types of electrical components specifications.
    1. Switchboards.
    2. Panelboards.
    3. M.C. Centers.
    4. Busways.
    5. NEMA enclosures.
    6. Electrical load requirements for machinery and organizations.
    7. Alternative conventions: IEC vs. NEMA.
  8. Design and implement practical lab exercises.
    1. Momentary control of control relays from one then two locations.
    2. Fwd-rev control w/interlocking.
    3. Jogging.
    4. Garage door problems.
    5. Electronic keys.
    6. Photocell applications.
    7. Traffic lights.
    8. A three floor elevator.
    9. Compelling sequence.
    10. Reciprocating table.
    11. Use a timer to implement 8.5.
    12. Use a timer to implement 8.7.
    13. Turn a light on for 3 sec. And off for 2 sec.
    14. Construct and demonstrate the circuitry necessary to fwd-rev control a 480 volt 3 phase motor.



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