ELEC-200: Ladder Diagrams and Motor Controls

Business, Entrepreneurship, and Professional Development
Adv Manufacturing/Fabrication
Electrical Engineering Technol
Academic Level
Course Subject
Course Number
Course Title
Ladder Diagrams and Motor Controls
Credit Hours
Instructor Contact Hours Per Semester
62.00 (for 15-week classes)
Student Contact Hours Per Semester
62.00 (for 15-week classes)
Grading Method
ELEC-103 or Instructor permission.
Catalog Course Description

Covers the fundamentals of electrical ladder diagrams and motor control circuits. Presents ladder logic, as well as labels, documentation, and symbology of electrical drawing with the use of ladder diagrams for troubleshooting. Also discusses control circuits for three-phase motors and sequential control of electro-pneumatic devices. Several single-phase control circuits are included in laboratory exercises. Also included in the lab exercises are sequencing electro-pneumatic devices. Introduces students to the variable frequency drive to control three phase motor speed. Students connect more than 40 circuits in the lab.

Goals, Topics, and Objectives

Core Course Topics
  1. Electrical tools, instruments, and safety.
  2. Electrical symbols and line diagrams.
  3. Ladder logic and line diagrams.
  4. A.C. manual contractors and motor starters.
  5. Magnetism and magnetic solenoids.
  6. A.C. and D.C. contactors and magnetic motor starters.
  7. Forward and reversing starters.
  8. Time delay devices.
  9. Complex line diagrams and control devices.
  10. Plugging and anti-plugging.
  11. A.C. reduced voltage starters.
  12. Solid state electronic controls.
  13. Multi-speed motor controls.
  14. Single-phase starters and reversing circuits.
  15. Single phase multi-speed circuits.
  16. Sequencing of electro-pneumatic devices.
  17. Introduction to the variable frequency drive.
  18. Demonstrate the ability to connect over 40 complex circuits in the lab.
Core Course Learning Objectives (Separated)
  1. Demonstrate the proper use of electrical tools, instruments, and electrical safety procedures.
  2. Read and draw electrical ladder diagrams and recognize all electrical symbols.
  3. Apply use of electrical ladder diagrams to troubleshoot circuits.
  4. Demonstrate an understanding of and apply the concepts of motor starters and physically wire a manual motor starter circuit.
  5. Demonstrate knowledge of magnetic contactors and solenoids and wire them into electrical control circuits.
  6. Demonstrate an understanding of the operation of a magnetic motor starter circuit and successfully wire a magnetic starter.
  7. Demonstrate an understanding of the following concepts utilized in three phase A.C. motor control circuits and be able to implement them in the lab: forward and reverse starting, plugging and anti-plugging, multi-speed operation, and braking circuits.
  8. Demonstrate an understanding of the concept of reduced voltage starters.
  9. Compare three phase motor control circuits to single phase motor control circuits and be able to wire single phase motor control circuits.
  10. Demonstrate knowledge of electrical timers and apply them in electrical control circuits.
  11. Demonstrate application of industrial electronic control circuits.
  12. Demonstrate knowledge of electropneumatic directional control valve.
  13. Demonstrate knowledge and wiring of ladder diagrams that control the sequencing of cylinders for machine controls.
  14. Demonstrate knowledge of variable frequency drives to control motor speed.

Assessment and Requirements

Assessment of Academic Achievement
  1. Tests given throughout the semester. Tests represent 50 percent of the course grade.
  2. Informal and Formal laboratory activities and performance exercises in which students demonstrate an understanding of assigned circuits. Formal laboratory activities are submitted as a written report and represents 50 percent of the course grade.
  3. Connection of over 40 complex circuits must be made operational by students.


Satisfies Wellness Requirement
Effective Term
Winter 2024