Maricopa Community Colleges  ABC263   20052-20086 
Official Course Description: MCCCD Approval: 07/22/08
ABC263 20052-20086 L+L 2 Credit(s) 2 Period(s)
Motors and Advanced Controls
Electric motor operation including; motor starters, insulation and unusual service conditions. Troubleshooting and repairing specific electric motors. Solid state control circuits, schematic and wiring diagram reading and techniques for jogging, plugging and braking motors.
Prerequisites: (Registered apprentice status, ABC143 and ABC221) or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC263   20052-20086 Motors and Advanced Controls
1. Describe basic principles of electric motor operation; including single phase AC motors and polyphase AC motors. (I)
2. Define "Reduced Voltage Starting" and describe specific types of reduced voltage starters. (II)
3. Explain the purpose of insulation in a motor and describe specific classes of insulation and their properties. (III)
4. Describe specific unusual motor service conditions and their effects. (IV)
5. Explain the purpose of a Dielectric Voltage Withstand Test (Hipot Test) and describe how to perform it safely on specific electrical components. (V)
6. Describe specific methods for cleaning and drying electrical insulation including; safety precautions, appropriate methods for specific motor types and short-circuit method for synchronous motors and condensers. (VI)
7. Identify specific malfunctions, determine probable cause and explain procedure for repair with specific electric motors and conditions. (VII)
8. Identify specific components in control circuits by actual inspection. (VIII)
9. Read and interpret motor-control wiring diagrams, schematics, one-line, loop and ladder diagrams. (VIII)
10. List advantages of solid state control circuits and describe necessary precautions when working with solid-state motor controls. (IX)
11. Explain "plugging" and "jogging" techniques for controlling motors and demonstrate the proper connections. (X)
12. Describe specific means of stopping or braking a motor and how motor brakes operate. (X)
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MCCCD Official Course Outline:
 
ABC263   20052-20086 Motors and Advanced Controls
    I. Basic Motor Principles
        A. Magnetism
        B. Motor function
          1. Current
          2. Polarity
        C. AC motors
          1. Single-phase AC
          2. Three-phase AC
        D. Polyphase AC motors
          1. Squirrel-cage induction
          2. Wound rotor
          3. Synchronous
      II. Motor Starters
          A. Across the line starting
          B. Reduced voltage starting
            1. Primary resistor
            2. Autotransformer
            3. Wye-delta
            4. Part-winding
        III. Insulation and Insulation Materials
            A. Class A
            B. Class B
            C. Class F
            D. Class H
          IV. Service Conditions and Effects
              A. High temperature
              B. Frequency variation
              C. Voltage variation
              D. Rigidity
              E. Ventilation
            V. Dielectric Voltage Withstand Tests
                A. AC
                B. DC
              VI. Electrical Insulation - Cleaning and Drying
                  A. Cleaning
                    1. Methods
                    2. Materials
                    3. Safety precautions
                  B. Drying
                    1. Inspection
                    2. Methods
                    3. Safety precautions
                  C. Synchronous motors and condensers
                VII. Troubleshooting
                    A. Identify problem
                    B. Determine cause
                    C. Repair procedure
                  VIII. Motor Controllers
                      A. Controller components and related symbols
                      B. Types
                        1. Reversing manual starters
                        2. Drum switches
                        3. NEC requirements
                      C. AC magnetic starters - schematics
                      D. Magnetic reversing controllers
                        1. Combination starters
                        2. Part-winding starters - schematic
                        3. Wye-delta starters - schematic
                        4. Primary resistance starters - schematic
                      F. Miscellaneous motor controls
                        1. Pneumatic and motor driven relays
                        2. Control transformers
                        3. Limit switches
                        4. Solenoids
                        5. Foot switches
                        6. Pressure float switches
                      G. Direct current controllers
                    IX. Solid-State Control Circuits
                        A. Silicon controlled rectifiers (SCR)
                          1. Operation
                          2. Ratings and characteristics
                          3. Phase control applications
                        B. Solid-state motor starters
                          1. Function
                          2. Characteristics
                        C. Adjustable speed drives
                          1. DC drive with DC motor
                          2. Voltage source invertor
                          3. Current source invertor
                          4. Slip energy recovery system
                          5. Load-commutated invertor with synchronous motor
                          6. Cycloconverter drive for synchronous or induction motor
                        D. Precautions
                      X. Methods of Deceleration
                          A. Plugging
                          B. Jogging
                          C. Braking
                            1. Type SA brakes
                            2. Type DL shoe brakes
                          D. Troubleshooting electric brakes
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