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April 2007 Variable Voltage Made Easy

Author:
Format: CEU (CONTINUING EDUCATION)
Publication Date: 2007
Article Link: Read Article

$75.00

9939 in stock

Description

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

This test is based on the article, Variable Voltage Made Easy, published in the April 2007 issue and counts as 3 contact hours (0.3 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 theory of variable-voltage control applied to elevators using the Ward-Leonard system
  • methods of obtaining control of acceleration, deceleration and leveling
  • how to circumvent residual currents
  • the best way to obtain smooth control of elevator motion
  • the use of damping-field and shunt-field motor control
  • the design and operation of a self-excited generator
  • the methods designed to prevent the hoist motor from pulling through the brake
  • what happens when motor load and slip increase
  • resistance and Star-Delta methods of AC-motor starting
  • troubleshooting noises in the driving motor on a motor-generator set
  • causes of sparking in generators and hoist motors
  • how to check a DC machine or motor-generator set for electrical neutral
  • how to trace various variable-voltage problems to parts of the system
  • how to determine the synchronous speed of a motor
  • determining the causes and finding remedies for rough stops

Enrollment Procedures:

  1. If you do not already have an account on elevatorbooks.com, you will need to create one. NOTE: the name of the person purchasing must be the same name as the person who will take the exam.
  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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