ELT 131 - Motor Controls

1. Evaluate safety awareness.
   1. Identify hazards performing electrical work
   2. Contrast hazards with industry safety standards
   3. Explain the purpose and proper use of personal protective equipment (PPE) and lockout/tagout (LOTO) procedures
   4. Demonstrate safety procedures while working on motor control circuits and equipment
   5. Assess potential electrical hazards in motor control systems and propose mitigation strategies
2. Interpret NEMA symbols
   1. Recognize common NEMA symbols for relays, contactors, motor starters, pushbuttons, pilot lights, switches, and motors.
   2. Describe the function of NEMA-standard components in motor control systems
   3. Identify and label NEMA symbols on schematics and ladder diagrams
   4. Explain NEMA ratings for enclosures
   5. Differentiate alternative symbol conventions: IEC vs. NEMA
3. Analyze power distribution systems and fundamentals
   1. Describe Switchboards, Panelboards, M.C. Centers, and Motor Control Panels
   2. Describe transformers and magnetic induction in AC systems
   3. Identify Delta and Wye transformer connections
   4. Illustrate DC power supply fundamentals
   5. Differentiate motor power circuits and control circuits
   6. Explain the load requirements for motor power circuits and control circuits
   7. Recognize overcurrent protection and circuit load sizing requirements for motor power circuits and control circuits
4. Evaluate AC and DC motor types and operation
   1. Describe Single phase and three phase AC Motors fundamentals
   2. Identify Delta and Wye motor connections
   3. Describe how a motor’s rotary magnetic field is developed
   4. Describe shunt, series, and compound wound DC motors
   5. Explain shaded pole motors
5. Assess motor control applications with aid of schematics and ladder/line diagrams
   1. Differentiate standard schematics, pictorial diagrams, and ladder diagrams
   2. Illustrate symbols, descriptions, and notation used for ladder diagrams
   3. Interpret the three basic sections of a ladder diagram
   4. Explain relay logic (AND/OR/NAND/NOR/NOT) circuits
   5. Compare two- and three-wire control circuits
   6. Explain manual motor control
   7. Distinguish electromechanical controls: coils, relays, contactors, and motor starters
   8. Describe memory/latching circuits
   9. Examine interlocking, sequencing, and timers in motor controls
   10. Describe arch suppression and shading coils
   11. Compare reduced current starting with Variable Frequency Drives, Soft starters, and DC Controllers.
   12. Explain methods for forward and reverse operation of three phase, single phase, and DC motors.
6. Analyze practical lab exercises from schematics and ladder diagrams
   1. Construct two- and three-wire circuits.
   2. Employ relays and contactors in motor control circuits
   3. Demonstrate push button wiring in electromechanical controls
   4. Assemble circuits with pilot lights
   5. Design timing controls in motor control circuits
   6. Demonstrate the circuitry necessary for fwd-rev control of a 3 phase motor
   7. Troubleshoot lab results to identify wiring errors or component malfunctions
   8. Describe corrective actions to ensure circuits operate properly and safely