December 2007: The Perfect Drive and Get the Lead Out!
SPECIAL NOTICE: Please check each course for verification of approval before purchasing.
This test is based on the articles, The Perfect Drive, (EW December 2007 page 57) and Get the Lead Out!, (EW December 2007 page 77) and counts as 1 Contact Hour (0.1 CEU) towards recertification. 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, Oklahoma, Pennsylvania, Vermont, Virginia, Washington, West Virginia, Wisconsin.
Learning Objectives - After reading these articles, you should have learned about:
- the comparison of planetary and gearless elevator drives
- the use of synchronous motor and planetary gearing in elevator hoist machines
- the duty cycle in elevator machine application
- the effect of inverter clock frequency on elevator ride quality
- the use of planetary drive machines for machine-room-less elevators
- the composition of carbon brushes
- the factors that can adversely affect commutator film
- why the film is important
- the causes of shortened brush life
- how to measure current density
- the characteristics of brush materials
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