The role of the 21st century lifts

As a modern high-rise building elevator vertical transport is closely related with people's lives, as people on the elevator operational safety, efficiency, comfort and other requirements continue to increase, lifts rapid development. Drag technology has developed to the FM voltage control, which is also controlled by the PLC logic to replace the original relay control.
The design takes into account the actual operation of passenger lift function, but also take into account the load lift control with recursive functions, the design of the control system for the four lifts. Instead of the traditional relay control system, the frequency of the drag on the lift speed, the PLC control drag devices combined to form PLC control system, to achieve a variety of elevator control functions, improve the lifts operational reliability and reduce the failure rate.
Accompanied by a higher level of factory automation, PLC Powered pallet truck controller in the plant more and more widely, and almost all aspects related to the plant, including power supply, production, materials management, transportation and so on. This paper aims to achieve automatic control system for such a crawl typical example, to show the PLC in automated production applications, while taking advantage of the typical applications with a little change can be extended to other control systems.
Programmable controller to achieve the lifting platform lift control for improving the operational stability, reduce the cost of lift control system and shorten the development cycle of lift systems have practical significance. Through this research project, to a certain extent, promote the development of related industries lifts, expanding PLC applications in the automation industry, has some economic and theoretical significance.