October 2011 Variable-Frequency Drive Systems for Hydraulic Elevators
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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