AIT 225 - Industrial Motors and Motor Controls

3 Credits, 5 Contact Hours
2 lecture periods 3 lab periods
An introductory course in DC, single-phase AC, and 3-phase AC electric motors and motor control circuits. Includes motor control circuit components, motor control circuit applications, sequence circuits, and timer circuits. 

Prerequisite(s): AIT 125  
    

1. Install DC, single-phase AC, and 3-phase AC electric motors. 
2. Test DC, single-phase AC, and 3-phase AC electric motors. 
3. Interpret electric motor control component symbols and motor control circuit diagrams/schematics.  
4. Describe motor control circuit components, such as contactors, manual starters, control relays, auxiliary contacts and overloads.
5. Install motor control circuit components, such as contactors, manual starters, control relays, auxiliary contacts and overloads.
6. Troubleshoot electrical motor control circuit faults. 

   A. Installing DC and AC electric motors to a manual switch (given a power schematic)

   B. Operation of a DC and AC electric motors

   C. Operation of DC motor configurations (e.g. compound, series, shunt)

   D. DC and AC motor specifications interpretations

   E. DC and AC motor nameplate interpretation

   F. Multimeter and mega-ohmmeter (megger) to test a DC and AC motor

   G. Operation of a DC motor speed controller (its function/purpose)

   H. Function of a motor brake 

   I.  Operation and function of a bearing grounding ring

   J. How to select an AC motor overload

  K. Descriptions and calculations of synchronous motor speed, types of motor torque, horsepower, kilowatts, apparent power, true power, motor slip, motor efficiency and operational cost analysis

  L. Power factors and power factor corrections

II. Interpret electric motor control component symbols and motor control circuit 

 schematic diagrams.

   A. Interpret ladder and wiring diagrams

   B. Types of basic electrical relay components and electric motors

   C. Schematic and wiring diagrams including, labels, electrical symbols and connections

III. Describe the operation of and install motor control circuit components, such as contactors, manual starters, control relays, auxiliary contacts, and overloads

1. Explain what an electric motor control circuit is and how it functions.
2. Install and operate the following circuits
   1. Manual motor starters
   2. Basic machine control 
   3. Magnetic motor control
   4. Reversing motor 
   5. Sequence
   6. Timers

IV. Troubleshooting 

1. Electrical motor relay control circuit fault
2. Basic electrical relay components and electric motors
3. Basic electrical components in an electrical relay control circuit using in-circuit tests
4. Multimeter to take electrical circuit readings during in-circuit testing
5. Systematic methodology for electrical relay control circuits with AC and DC motors with various symptoms