Lesson 5

14 Homework 5

Ken Dickson-Self

  1. What is the first step in troubleshooting any system?
  2. What would happen in a scenario where only the primary power to the motor is lost, while pilot-level ladder logic remains functional)?
  3. Describe the difference between overloads in manual reset mode and automatic reset mode.
  4. What is “jogging” or “inching”
  5. When is jogging used?
  6. What is in-rush current and what is its proportion compared to normal full-load current?
  7. Describe the purpose of a magnetic reversing motor starter and how it functions.
  8. What is an interlock and what are the three different types?
  9. Why must magnetic reversing motor starters contain an interlock?
  10. What types of events may cause an overload?
  11. If a motor is running in reverse mode when the overloads are tripped, can the motor be run in forward mode? Also, what is required in order to start the motor in reverse mode again?
  12. What happens when the electrical interlocks are removed form a circuit and the reverse button is pressed while the motor is running in the forward direction (mechanical interlocks are in place)?

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Troubleshooting Motors and Controls by Ken Dickson-Self is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, except where otherwise noted.

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