技师论文1（Technician thesis 1）.doc

技师论文1（Technician thesis 1） The maintenance electrician Three layer elevator PLC control Name: Li Shuai ID number:Unit: Dezhou Yatai group This paper introduces the origin and development of the elevator, the characteristics and status of the freight elevator, and the design of the purpose, content and significance. The first to lift the definition, types, composition of interpretation, so as to have a preliminary understanding of the elevator. Then introduced the programmable controller development stage, definition, basic structure, working principle, performance index, PLC features, PLCs application and selection; introduces the basic composition of the inverter, the inverter inverter classification, vector control principle and elevator frequency control characteristics. The design thought of elevator control system of the elevator control system uses a random control logic. Keywords: programmable controller, elevator control, inverter The design of an elevator system 1.1 of the overall plan At present, the elevator industry in the rapid development of our country, has a large market in a certain extent. Today in the elevator motion selection control device has been from the traditional relay - contactor into programmable controller (PLC). The programmable controller (PLC) compared with other computer control: The personal computer has a strong function of data processing and graphic display function, rich software support, but they are designed for office automation and home, the environment very high, anti-interference ability is not strong, generally not suitable for use in industrial field. SCM is an integrated circuit, it can not be directly connected to the external I/O signal. It will be used for industrial control, but also some additional supporting integrated circuit and I/O interface circuit, hardware design, program design and making a considerable effort, are required to have a very strong computer in the field of theoretical know