外文翻譯---基于plc電梯控制系統(tǒng)的設計與實踐

1、翻譯部分英文原文 英文原文Design and Practice of an Elevator Control System Based on PLCAbstractThis paper describes the development of 2 nine-storey elevators control system for a residential building.The control system adopts PLC a

2、s 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 contr

3、ol 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 e

4、levators.1.IntroductionWith 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 trans

5、port 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 ele

6、vator 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 su

7、ch 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 e

8、levator 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 meth

9、od of the elevator PLC control system in detail.2.System structureThe 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.Electr

10、ic power driving systemThe electric power driving system includes:the elevator car,the traction requirements.Informally,the elevators behavior is defined as follows.(1)Running with a single elevatorGenerally,an elevator

11、has three operation states: normal mode,fire-protection mode and maintenance mode.The maintenance mode has the highest priority. Only the maintenance mode is canceled can the other operation modes be implemented.The next

12、 is fire-protection mode,the elevator must return to the bottom floor or base station immediately when the fire switch acts.The elevator should turn to normal operation mode when the fire switch is reset.Under normal ope

13、ration mode,the control system’s basic task is to command each elevator to move up or down,to stop or start and to open and close the door.But is has some constraints as follows:Each elevator has a set of 9 buttons on th

14、e car control panel,one for each floor.These buttons illuminate when they are pressed and cause the elevator to visit the corresponding floor.The illumination is canceled when the corresponding floor is visited by the el

15、evator.Each floor,except the first and the top floor,has two buttons on the floor control panel,one to request an up- elevator,one to request a down-elevator.These buttons illuminate when they are pressed.The illuminatio

16、n is canceled when an elevator visits the floor,then moves in the desired direction.The buttons on the car control panel or the floor control panel are used to control the elevator’s motion.The elevator cannot pass a flo

17、or if a passenger wants to get off there.The elevator cannot stop at a floor unless someone wants to get off there.The elevator cannot change direction until it has served all onboard passengers traveling in the current

18、direction, and a hall call cannot be served by a car going in the reverse direction.If an elevator has no requests,it remains at its current floor with its doors closed.(2)Parallel running with two elevatorsIn this situa

19、tion,there are two elevators to serve the building simultaneously.It runs at 7am to 9am and 5pm to 7pm every day.When an elevator reaches a level,it will test if the stop is required or not.It will stop at this level whe

20、n the stop is required.At the same time,to balance the number of stops,the operation of two elevators will follow a certain dispatching principle.An elevator doesn’t stop at a floor if another car is already stopping,or