基于PLC电梯控制系统的设计外文翻译.docxVIP

翻译部分 英文原文 Design and Practice of an Elevator Control System Based on PLC Abstract This paper describes the development of 2 nine-storey elevators control system for a residential building.The control system adopts PLC as controller,and uses a parallel connection dispatching rule based onminimum waiting timeto run 2 elevators in parallel mode.The paper gives the basic structure,control principle and realization method of the PLC control system in detail. It also presents the ladder diagram of the key aspects of the system.The system has simple peripheral circuit and the operation result showed that it enhanced the reliability and performance of the elevators. 1.Introduction With the development of architecture technology,the building is taller and tallerand elevators become important vertical transportation vehicles in high-rise buildings.They are responsible to transport passengers, living,working or visiting in the building,comfortable and efficiently to their destinations.So the elevator control system is essential in the smooth and safe operation of each elevator.It tells the elevator in what order to stop at floors,when to open or close the door and if there is a safety-critical issue. The traditional electrical control system of elevators is a relay-controlled system.It has the disadvantages such as complicated circuits,high fault ratio and poor dependability;and greatly affects the elevator’s running quality.Therefore,entrusted byan enterprise,we have improved electrical control system of a relay-controlled elevator in a residential building by using PLC.The result showed that the reformed system is reliable in operation and easy for maintenance. This paper introduces the basic structure,control principle and realization method of the elevator PLC control system in detail. 2.System structure The purpose of the elevator control system is to manage movement of an elevator in response to user’s requests.It is mainly composed of 2 parts: 2.1.Electric power driving