Limit switches

Lesson Descriptions

This library consists of four lessons designed to provide training for the multi-craft training needs of process and manufacturing facilities.

Overview


Description: This is the first lesson in the iKNOW™ Limit Switches Library. This lesson describes limit switches, how they work, how to recognize them, and typical applications in which they are used.

Prerequisites: None

Topics:

  1. Purpose and Function
  2. Types of Limit switches
  3. Safety Consideration
  4. Replacement Compatibility

Objectives:

  • Define the purpose, function, and types of limit switches
  • Explain and visually identify each of the limit switches
  • Describe safety considerations when working with limit switches
  • Know how to ensure that a replacement switch will work correctly

Lever-Actuated


Description: This is the second lesson in the iKNOW™ Limit Switches Library. This lesson describes limit switches, how they work, how to recognize them, and typical applications they are used in.

Prerequisites: General knowledge of limit switches. Completion of the lesson, Limit switches: Overview.

Topics:

  1. FunctionPossible
  2. Malfunctions
  3. Maintenance and Troubleshooting

Objectives:

  • Describe the internal function of a lever-actuated limit switch and its function in a control circuit
  • Maintain, troubleshoot, repair, and adjust a lever-actuated limit switch
  • Describe the possible malfunctions of a lever-actuated limit switch

Solid State


Description: This is the third lesson in the iKNOW™ Limit Switches Library. This lesson describes solid state limit switches, how they work, how to recognize them, and typical applications in which they are used.

Prerequisites: General knowledge of limit switches. Completion of the lesson, Limit switches: Overview.

Topics:

  1. Photoelectric switches
  2. Proximity switches
  3. Function in a Circuit
  4. Possible Malfunctions
  5. Troubleshooting and Repair
  6. Adjustment

Objectives:

  • Describe the function of solid state limit switches
  • Maintain, troubleshoot, repair, and adjust solid state limit switches
  • Describe the possible malfunctions of solid state limit switches

Torque and Geared


Description: This is the final lesson in the iKNOW™ Limit Switches Library. This lesson describes geared limit switches and torque switches. This lesson also discusses maintenance, troubleshooting, and adjustment requirements for these switches.

Prerequisites: Review of the lesson, Limit switches: Overview, is recommended.

Topics:

  1. Internal Function
  2. Function in a Circuit
  3. Malfunctions and Maintenance
  4. Troubleshooting and Repair
  5. Adjustment

Objectives:

  • Explain the internal function of a geared limit switch and torque switch in a control circuit
  • Maintain, troubleshoot, repair, and adjust solid state limit switches
  • Describe the possible malfunctions of a geared limit switch and torque switch
  • Troubleshoot, maintain and repair these switches