外文翻譯---基于plc電梯控制系統(tǒng)的設(shè)計與實踐（英文）

1、Design and Practice of an Elevator Control System Based on PLC Xiaoling Yang1, 2, Qunxiong Zhu1, Hong Xu1 1 College of Information Science and greatly affects the elevator’s running quality. Therefore, entrusted by an

2、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 maintenan

3、ce. 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

4、of an elevator in response to user’s requests. It is mainly composed of 2 parts: 2.1. Electric power driving system The electric power driving system includes: the elevator car, the traction motor, door motor, brake me

5、chanism and relevant switch circuits. Here we adopted a new type of LC series AC contactors to replace the old ones, and used PLC’s contacts to substitute the plenty of intermediate relays. The circuits of traction m

6、otor are reserved. Thus the original control cabinet’s disadvantages, such as big volume and high noise are overcome efficiently. 2.2. Signal control system The elevator’s control signals are mostly realized by PLC. Th

7、e input signals are: operation modes, operation control signals, car-calls, hall-calls, safety/protect signals, door open/close signal and leveling signal, etc. All control functions of the elevator system are realize

8、d by PLC program, such as registration, display and elimination of hall-calls or car-calls, position judgment of elevator car, choose layer and direction selection of the elevator, etc. The PLC signal control system

9、diagram of elevator is showed in Figure 1. Figure 1 PLC signal control system diagram 2.3. Requirements The goal of the development of the control system is to control 2 elevators in a 9-storey residential building. For

10、 each elevator, there is a sensor located at every floor. We can use these sensors to locate the current 2008 Workshop on Power Electronics and Intelligent Transportation System978-0-7695-3342-1/08 $25.00 © 2008 IEE

11、E DOI 10.1109/PEITS.2008.44 94The whole program is mainly composed of 10 modules: hall-call registration and display module, car-call registration and display module, the signal combination module, the hall-call cancel

12、 module, the elevator-location display module, the floor selection module, the moving direction control module, the door open/close module, the maintenance operation module and the dispatching module under parallel r

13、unning mode. The design of the typical modules is described as follows: 3.1. Hall-call registration and display There are two kinds of calls in an elevator: hall-call and car-call. When someone presses a button on the f

14、loor control panel, the signal will be registered and the corresponding lamp will illuminate. This is called hall-call registration. When a passenger presses a button in the elevator car, the signal will be registered

15、 and with the corresponding lamp illuminated. This is called car-call registration. Figure2 shows the ladder diagram of up hall-calls registration and display. The self-lock principle is used to guarantee the calls’ co

16、ntinuous display. Figure 2 up hall-call registration and display 3.2. The collective selection of the calls Here the collective selection control rules are used. As showed in Figure3, M5.1-M5.7, M6.0 and M6.1 are auxili

17、ary relays in PLC. They denote the stopping request signal of 1st to 9th floor respectively. The auxiliary relay M6.2 denotes the elevator driver’s operation signal. When there is a call in a certain floor, the stoppi

18、ng signal of corresponding floor will output. When the elevator is operated by the driver, the hall-calls will not be served. And the elevator cannot pass a floor at which a passenger wishes to alight. 3.3. The cance

19、llation of the calls The program of this module can make the elevator response the hall-calls which have the same direction as the car’s current direction, and when a hall-call is served, its registration will be cance

20、led. The ladder diagram of up hall-calls’ cancellation is showed in Figure4. Figure 3 The combination of the calls Figure 4 The cancellation of up calls In Figure4, the auxiliary relay M4.0 is the up moving flag of the

21、elevator. When the current direction of the elevator is up, M4.0’s contacts are closed; on the contrary, when the current direction of the elevator is down, M4.0’s contacts are opened. M0.1 to M0.7 denotes the car-cal

22、ls’ stopping request signal of floor 2 to floor 8 respectively. This program has two functions: (1) Make the elevator response the normal down hall-calls when it is moving down, and when a down hall-call is served, it