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1、翻译部分英文原文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 as controller,and uses a parallel connection dispatching rule based onminimum waiting
2、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
3、 it enhanced the reliability and performance of the elevators.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 transport passengers, living,wor
4、king 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 issu
5、e.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 elevators running quality.Therefore,entrusted byan enterprise,we have improved electrical contro
6、l 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.
7、2.System structureThe purpose of the elevator control system is to manage movement of an elevator in response to users requests.It is mainly composed of 2 parts:2.1.Electric power driving systemThe electric power driving system includes:the elevator car,the traction motor,door motor,brake mechanism
8、and relevant switch circuits.Here we adopted a new type of LC series AC contactors to replace the old ones,and used PLCs contacts to substitute the plenty of intermediate relays. The circuits of traction motor are reserved.Thus the original control cabinets disadvantages,such as big volume and high
9、noise are overcome efficiently.2.2.Signal control systemThe elevators control signals are mostly realized by PLC.The 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 el
10、evator system are realized 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 diagram of elevator is showed in Figure 1.Figure 1 PLC signal co
11、ntrol system diagram2.3.RequirementsThe goal of the development of the control system is to control 2 elevators in a 9-storey residential building.For each elevator,there is a sensor located at every floor.We can use these sensors to locate the current position of the elevator car.The elevator ar do
12、or can be opened and closed by a door motor.There are 2 sensors on the door that can inform the control system about the doors position.There is another sensor on the door can detect objects when the door is closing.The elevator cars up or down movement is controlled by a traction motor.Every floor,
13、except the first and the top floor,has a pair of direction lamps indicating that the elevator is moving up or down.Every floor,has a seven segment LED to display the current location of the elevator car.The first step for the development of the elevator control is to define the basic requirements.In
14、formally,the elevators behavior is defined as follows.(1)Running with a single elevatorGenerally,an elevator 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
15、modes be implemented.The next 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 operation mode,the control systems basic task is to co
16、mmand 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 the 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 elevator.Each floor,except the fir
