Maricopa Community Colleges  ABA253   19964-20032 
Official Course Description: MCCCD Approval: 04/23/96
ABA253 19964-20032 LEC 1 Credit(s) 1 Period(s)
Motor Maintenance-Part 2
Principles of electric motor operation including reduced voltage starting. Properties of insulation and motor service conditions. Dielectric Voltage Withstand Test. Cleaning and drying electrical insulation. Troubleshooting electric motors. Prerequisites: (Indentured status with the Arizona Builders Alliance and ABC143) or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABA253   19964-20032 Motor Maintenance-Part 2
1. List and define trade terms associated with motor maintenance. (I)
2. Describe basic principles of electric motor operation including single phase and polyphase Alternating Current (AC) motors. (II)
3. Define "Reduced Voltage Starting" and describe specific types of reduced voltage starters. (III)
4. Explain the purpose of insulation in an electric motor and describe specific classes of insulation and their properties. (IV)
5. Describe specific motor service conditions and their effects. (V)
6. Explain the purpose of a Dielectric Voltage Withstand Test and describe how to perform it safely on specific electrical components. (VI)
7. Describe specific methods for cleaning and drying electrical insulation including safety precautions. (VII)
8. Explain malfunctions, causes and repair procedures for specific electric motors. (VIII)
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MCCCD Official Course Outline:
 
ABA253   19964-20032 Motor Maintenance-Part 2
    I. Trade terms
        A. Breakdown torque
        B. Dielectric
        C. Drip-proof motor
        D. Encapsulated motor
        E. Explosion proof motor
        F. Guarded motor
        G. Hipot tester
        H. Insulation
        I. Leakage
        J. Locked rotor torque
        L. Other
      II. Basic motor principles
          A. Magnetism
          B. Motor function
            1. current
            2. polarity
          C. AC motors
            1. single-phase
            2. three-phase
          D. Polyphase AC motors
            1. squirrel-cage induction
            2. wound rotor
            3. synchronous
        III. Motor starters
            A. Across-the-line starting
            B. Reduced-voltage starting
              1. primary resistor
              2. autotransformer
              3. wye-delta
              4. part winding
          IV. Insulation and insulation materials
              A. Class A
              B. Class B
              C. Class F
              D. Class H
            V. Service conditions and effects
                A. High temperature
                B. Frequency variation
                C. Voltage variation
                D. Rigidity
                E. Ventilation
              VI. Dielectric voltage withstand tests
                  A. AC
                  B. DC
                  C. Safety
                  D. Test procedures
                VII. Cleaning and drying electrical insulation
                    A. Cleaning
                      1. methods
                      2. materials
                      3. safety precautions
                    B. Drying
                      1. inspections
                      2. methods
                      3. safety precautions
                    C. Synchronous motors, condensers and converters
                  VIII. Troubleshooting techniques
                      A. Identifying problems
                      B. Determining causes
                      C. Repair procedures
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