Continuing Education
Voltage Sags
How these phenomena affect the elevator industry and steps that can be taken to mitigate their effects by Dr. Albert So and Dr. W.L. Chan Your authors were first inspired...
What Is a Transistor?
Another major electronic component used in elevators is detailed. Like diodes, transistors are major players in the electronics arena, notably in elevator motion controllers and variable-frequency drives (VFDs) that have...
MOSFETs
This article on metal-oxide semiconductor field-effect transistors (MOSFETs) builds on lessons from the prior piece “What Is a Diode?” (ELEVATOR WORLD, August 2014). Metal-oxide semiconductor field-effect transistors (MOSFETs) are similar...
The Hidden Details of Modernization
Many modern elevators have been in service since the 1980s. Due to continued building codes with grandfather clauses (which discourage a sense of the need to modernize), most still use...
What Is a Diode?
The first diodes were the cat’s whiskers used to extract audio from a modulated radio frequency signal. Then there were diode vacuum tubes that performed the same function but were...
False Car
This Continuing Education article discusses the main components of the False Car system and its uses and specifications. The Wurtec False Car is designed to be used as part of...
Common Misconceptions Regarding Elevator Traffic Simulations
Elevator professionals and elevator customers look to both traditional, formula-based elevator traffic analysis and sophisticated elevator simulation programs to evaluate potential and existing elevator performance with regard to appropriate traffic...
VF Drives
Humans have made use of elevators for centuries, but real advances were not possible until the introduction of the electric motor. There had been water-hydraulic-powered elevators, and before them, human-...
Metal Raceways in Elevator Work
The National Electrical Code (NEC) devotes an entire article (NEC 620) to requirements for elevator wiring, along with other specialized mandates for dumbwaiters, escalators, moving lifts and stairway chairlifts (ELEVATOR...
Energy-Efficient VVVF Hydraulic Lift Drive
Both developed and developing countries are facing major challenges to reduce carbon emissions and environmental impact. While new energy-efficient products are hitting the market every day, energy-efficiency norms and guidelines...
