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MEC 205 - Troubleshooting Advanced Motor Controls

Credits: 3
3 Skills Lab Hours

Prerequisites: EET 103  

This course covers the principles, application, troubleshooting and maintenance of rotating electrical motors as used in industry. Topics include various types of single and three-phase alternating current (AC) motors, various types of direct current (DC) motors, reduced voltage starting and braking. The course builds upon principles and applications covered in foundational electrical courses. All course material is supplemented with practical hands-on exposure to the items described.

Learning Outcomes
Upon successful completion of the course, the student will:

  1. Apply basic safety rules to work with electrical rotating machinery under 600 volts.
  2. Describe the operation, function, wiring and schematic symbols for DC series, DC shunt and DC compound motors.
  3. Measure electrical and mechanical motor speeds, torques and loads.
  4. Analyze torque, speed, power and efficiency for DC motors.
  5. Measure AC waveforms, frequency, apparent power, power factor, effective voltage, peak voltage, single-phase and three-phase power.
  6. Describe the operation and function of motor braking by plugging, electromechanical braking, DC injection braking and dynamic braking.
  7. Describe the operation and function of resistor, autotransformer and part-winding motor starting.
  8. Troubleshoot various starting and braking methods.
  9. Describe the function and operation of silicon controlled rectifiers (SCR) and how they may be applied for motor speed control.
  10. Measure the performance characteristics of AC and DC electrical motors.
Listed Topics
  1. Rotating electric motors
  2. DC shunt and compound motors
  3. Motor speed and torque
  4. Motor performance
  5. Split-phase AC motors
  6. Capacitor-start AC motors
  7. Three-phase AC induction motors
  8. Motor braking
  9. Reduced voltage starting
  10. Variable frequency AC drives
  11. Electronic sensors
  12. Electronic timers and counters
  13. SCR motor control
Reference Materials
Instructor-approved textbook and materials.
Students who successfully complete this course acquire general knowledge, skills and abilities that align with CCAC’s definition of an educated person. Specifically, this course fulfills these General Education Goals:
  • Information Literacy
  • Quantitative and Scientific Reasoning
  • Technological Competency
Approved By: Bullock, Quintin Date Approved: 05/17/2017

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