Continuing Education
Maintaining Elevators and Escalators in the Transit Environment, Part 1
An overview of the equipment and standards of escalators and elevators in transit systems Mass transit found in many major metropolitan cities is an intermodal network connecting bus, rail, automobile...
AECO Certification as Applied to a Wind-Turbine Tower Elevator
A real-world example of the process, methodology and ASME A17.7/CSA B44.7: Performance-Based Safety Code for Elevators and Escalators’ ability to ensure superior safety Much has been written about ASME A17.7/CSA...
LU/LA Elevators
A detailed examination of limited-use/limited-access (LU/LA) elevators and reasons for their use rather than traditional solutions Learning Objectives After reading this article, you should have learned:♦ Why LU/LA elevators were...
Constructional Stretch and Hoist-Rope Tension
Various aspects of hoist-rope tension, stretch and measurement are examined by Mike Barnes and Martin Rhiner Over the years, industry professionals have sometimes chosen to avoid performing the basic maintenance...
NEC Article 620: Elevators, Part 2
The conclusion of a series on the detailed examination of the National Electric Code’s impact on vertical transportation In Part One of this series (ELEVATOR WORLD, April 2012), we began...
NEC Article 620: Elevators, Part I
A detailed examination of the National Electric Code and its impact on vertical-transportation units photos by Judith Howcroft We generally think of the 19th century as the great age of...
Freight Elevator Door Control: An Opportunity for Wireless Technology
A comparison between hard-wired freight elevator door-control systems and wireless systems by Steven Reynolds, P. Eng and Henry E. Peelle, III, DM Introduction To date, wireless technologies have found only...
Elevator Drives, Power Quality and Energy Savings
The basics of variable-frequency drives, their advantages and how harmonics are created by Jonathan Bullick and Brad Wilkinson Introduction During the past 25 years, the use of AC variable-frequency drives...
Variable-Frequency Drive Systems for Hydraulic Elevators
An overview of the flexibility and various types of energy-efficient hydraulic drives An Overview Elevators with hydraulic drives are flexible by definition. Almost infinite configurations of elevator and cabin designs...
Rope Dynamics
This study explores how transient vibrations arise and why rope vibrations occur. by Phil Andrew, MSc, MPhil and Stefan Kaczmarczyk, PhD Rope vibrations in an elevator system usually result in...
