Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

Limit Switches - Omega

For hydraulic elevator applications, the limit switch package has been significantly reduced with the development of the digital controller / selector. The control signal communication functions such as direction, slow down and final limits are apart of the selector tape design. There are two mechanical limit switches for hoistway access. One switch (top) stops the car when the car top is level with the top landing sill.  The second switch (bottom) stops the car when the toe guard is level with the lowest landing header. All hydraulic elevator installations that fall under the ANSI A17.1 2000 code or later require hoistway access if the combination of travel and cab height leaves 35 or more inches from the top landing sill down to the top of car when the car is at the lowest landing.

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