December 2011-Elevator Drives, Power Quality and Energy Savings
SPECIAL NOTICE: Please check each course for verification of approval before purchasing. This test is based on the article, Elevator Drives, Power Quality and Energy Savings published in the December 2011 issue and counts as one contact hour (0.1 CEU) of elevator-industry continuing-education credit. Most courses are approved by NAEC for CET/CAT and NAESAI for QEI and in the following states: Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Kentucky, Maryland, Mississippi, Missouri, Montana, Oklahoma, Pennsylvania, Vermont, Virginia, Washington, West Virginia, Wisconsin. Learning Objectives - After reading this article, you should have learned about:
- The basic components and operation of an elevator VFD and regenerative unit How AC elevator drives create current harmonics
- How current harmonics create voltage distortion and affect the operation of electrical equipment
- How current harmonics can be reduced in elevator VFDs. The relative cost and performance of various harmonic mitigation and regenerative solutions
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