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October 2011 Variable-Frequency Drive Systems for Hydraulic Elevators

Publication Date: 2011
Article Link: Read Article


9981 in stock


SPECIAL NOTICE: Please check each course for verification of approval before purchasing.

This test is based on the article, Variable-Frequency Drive Systems for Hydraulic Elevators, published in the October 2011 issue and counts as one contact hour (0.1 CEU) of elevator-industry continuing-education credit. Most courses approved by NAEC for CET/CAT and NAESAI for QEI and in the following states: Alabama, Arkansas, Colorado, Florida, Georgia, Illinois, Indiana, Kentucky, Maryland, Mississippi, Missouri, Oklahoma, Pennsylvania, Vermont, Virginia, Washington, West Virginia, Wisconsin.

Learning Objectives - After reading this article, you should have learned about:

  • Why variable-speed drives are Important
  • Which type of variable-speed drives are useful for different applications
  • Conventional ride types with electronic control
  • How mechanical and electric control valves differ in their effects on the elevator system
  • The effects of frequency-controlled up and down rides on the elevator system
  • What to use when power connectivity is limited
  • The benefits of and applications of use for recovery and hydraulic recuperation
  • How to best deal with high ride Frequency
  • Load-dependent speed reduction

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  2. For articles, click the "Read Article" tab above to download and study the article. For other courses, be sure to purchase the corresponding book.
  3. Include your full name when purchasing the exam.
  4. Follow the instructions on the purchase confirmation page to log in to the Online Testing Center.
  5. If you scored 80% or above, you can immediately print your certificate of completion. If you fail the exam, you will be given instructions on how to pay a re-take fee and take the exam again.

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