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.

Controller/Selector Module

Controller/Selector Module: The controller, using microprocessor technology, receives and sends out signals that direct all the activities associated with the elevator. These include the following: the opening and closing of doors, when to speed up or slow down, the rate of acceleration and deceleration and where to stop. There are several different designs of selectors. The most common selector assembly consists of a metal tape running approximately the length of the hoistway. The selector box runs up and down on this metal tape and is mounted on top of the car. As the car moves up and down, the selector box sends signals back to the controller identifying the car location in the hoistway. For instance, car location is especially important as the elevator levels to the floor.

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