TAEL-200: Ladder Diagrams and Motor Controls

Business, Entrepreneurship, and Professional Development
Trade & Apprentice Education
Skilled Trade & Apprenticeship
Academic Level
Course Subject
Tael - Electrical
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
TAEL-145 or TAE Apprentice Coordinator/Instructor Permission
Catalog Course Description

Discusses the fundamentals of electrical ladder diagrams and motor control circuits. Covers ladder logic, labels, documentation, symbology of electrical drawings, and the use of ladder diagrams for troubleshooting. Examines several single phase control circuits, and explores how to design and draw control circuits for three-phase induction motors.

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. AC manual contactors and motor starters.
  5. Magnetism and magnetic solenoids.
  6. AC 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. AC 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 circuitism.
Core Course Learning Objectives (Separated)
  1. Demonstrate a clear understanding of electrical tools, instruments, and electrical safety procedures.
  2. Read and correctly draw electrical ladder diagrams and recognize all electrical symbols.*
  3. Troubleshoot electrical circuits using electrical ladder diagrams.*
  4. Describe 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. Describe the operation of a magnetic motor starter circuit and successfully wire a magnetic starter.
  7. Describe the following concepts utilized in three phase AC 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. Describe 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 by applying them in electrical control circuits.*
  11. Perform application of industrial electronic control circuits.*

Assessment and Requirements

Assessment of Academic Achievement

Methods for measuring achievement of objectives:

  1. Tests will be given throughout the semester.  Tests scores represent 35% of the course grade.
  2. Laboratory activities and performance exercises will be done where students will demonstrate an understanding of practical applications.  These will make up 35% of the course grade.
  3. A written final exam will be given which will represent 30% of the course grade.       

Texts, handouts, and/or workbooks will be determined by the TAE Department.


Effective Term
Summer 2014