基于plc電梯控制系統(tǒng)的設(shè)計(jì)與實(shí)踐外文翻譯-在線瀏覽
2025-02-08 06:19本頁(yè)面
【正文】 selection of the calls Here the collective selection control rules are used. As showed in Figure3, , and are auxiliary relays in PLC. They denote the stopping request signal of ist to 9th floor respectively. The auxiliary relay denotes the elevator driver?s operation signal. When there is a call in a certain floor, the stopping signal of corresponding floor will output. When the elevator is operated by the driver, the hallcalls will not be served. And the elevator cannot pass a floor at which a passenger wishes to alight. . The cancellation of the calls The program of this module can make the elevator response the hallcalls which have the same direction as the car?s current direction, and when a hallcall is served,its registration will be canceled. The ladder diagram of up hallcalls?cancellation is showed in Figure4. Figure3 The bination of the calls Figure4 The canclellation of up calls in Figure4, the auxiliary relay is the up moving flag of the elevator. When the current direction of the elevator is up, ?s contacts are closed。英文原文 2021 Workshop on Power Electronics and intelligent Transportation System Design and Practice of an Elevator Control System Based on PLC Xiaoling Yang1,2,Qunxiong Zhu1,Hong Xu1 1 College of information Science amp。Technology, Beijing University of Chemical Technology, Beijing 100029, China 2 Automation College of Beijing Union University,Beijing,100101, China yxl_lmy , , Abstract This paper describes the development of 2 ninestorey elevators control system for a residential building. The control system adopts PLC as controller, and uses a parallel connection dispatching rule based on minimum waiting time to 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. 1ntroduction With the development of architecture technology, the building is taller and taller and elevators bee important vertical transportation vehicles in highrise buildings. They are responsible to transport passengers, living, working or visiting in the building, fortable 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 safetycritical issue. The traditional electrical control system of elevators is a relaycontrolled system. it has the disadvantages such as plicated circuits, high fault ratio and poor dependability。 on the contrary, when the current direction of the elevator is down, ?s contacts are opened. to denotes the carcalls? stopping request signal of floor 2 to floor 8 respectively. This program has two functions: (1) Make the elevator response the normal down hallcalls when it is moving down, and when a down hallcall is served, its registration is canceled. (2) When the elevator is moving up, the corresponding floor?s down hallcall it passing by is not served and the registration is remained. The cancellation of down hallcalls is reversed with up hallcalls. . Elevator’s direction The elevator may be moving up or down, depending on the bination of hallcalls and carcalls. The following ladder diagram in illustrates that the elevator will move up. Figure5 shows that when the calls corresponding floor is higher than the elevator?s current location, the elevator will go up. Here the auxiliary relay is used as the upmoving flag. When the elevator is moving up, the upmoving lamp is illuminated, so the is connected on. When the elevator arrives the top floor, the upmoving lamp is off and the timer starts. After , the is disconnected, the upmoving disp
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