基于PLC的电梯控制系统设计中英文翻译.doc

Elevator System Based on PLC
Composed by the order of relay control system is a realization of the first elevator control method. However, to enter the nineties, with the development of science and technology and the widespread application of computer technology, the safety of elevators, reliability of the increasingly high demand on the relay control weaknesses are becoming evident.
Elevator control system relays the failure rate high, greatly reduces the reliability and safety of elevators, and escalators stopped often to take with the staff about the inconvenience and fear. And the event rather than taking the lift or squat at the end of the lift will not only cause damage to mechanical components, but also personal accident may occur.
Programmable Logic Controller (PLC) is the first order logic control in accordance with the needs of developed specifically for industrial environment applications to operate the electronic digital computing device. Given its advantages, at present, the relay control the lift has been gradually replaced by PLC control. At the same time, AC variable frequency motor speed control technology, the way the lift drag speed has been a gradual transition form DC to AC frequency converter. Thus, PLC control technology increases VVVF Elevator modern technology has become a hot industry.
1. PLC elevator control advantages:
(1) Used in elevator control PLC, with so ware for automatic control of lift operation, reliability greatly increased.
(2) Layer was removed and majority of the relay, the control system structure is simple, simplify the external circuit.
(3) PLC can be a variety of complex control system, easy to add or change control functions.
(4) PLC can be automated fault detection and alarm display to improve the operation of security and ease of maintenance.
(5) For the group control the allocation and management, and improve the efficiency of elevator operation.
(6)Do not need to change the control scheme changes when the hardware connection.
2. VVVF elevator control characteristics.
With the power electronics, microelectronics and computer technology to control the rapid development of technology, communication technology VVVF also a very rapid rate. AC variable frequency motor speed control technology is the power to improve the process in order to improve product quality and improving the environment and promoting technological progress as a primary means. Frequency of its excellent performance and the speed brake from a smooth performance, high efficiency, high power factor and power-saving of a broad scope of application and many other advantages of being at home and abroad recognized as the most promising approach speed.
Exchange characteristics of VVVF Elevator:
(1) low energy consumption.
(2) low load circuit, the re emergency power supply device of small.
In the acceleration stage, the required start-up current of less than 2.5 times the rated current. Peak starting current and time is short. Since the starting current is drastically reduced, so power consumption and power supply cable diameter can be reduced a lot. Required for emergency power supply devices are also relatively small size.
(3) high reliability and long service life.
(4) good comfort.
Elevator operation is best to follow the speed curve of a given operation. Their characteristics can be adapted to human feelings, and to ensure that noise operation, smooth brake Ping layer and high precision.
(5) stable noise-free.
(6) In the car, the engine room and adjacent areas to ensure that noise. Because their systems use a high clock frequency. Always produce a true sine wave power supply current yet. Motor torque ripple does not appear. Therefore, to eliminate vibration and noise.
3. Elevator control technology.
The so-called elevator control technology refers to the elevator drive system and electrical control system of automatic control. 70 as the 20th century in China’s elevator were marked by the exchange of two-speed elevator. Its speed is used to change the elevator traction motor of the very few, two or mute-level approach to the number of windings, very few of them as high-speed winding of the winding, a very few number of windings as the
low-speed winding. Windings for high-speed elevator-speed start-up and running, low-speed windings for braking and the maintenance of elevators.
The early 80s, VVVF inverter controlled variable lift system available. It uses AC motor drivers, are able to reach the level of DC motor, control the speed of the current has reached 6 m/sec. Its small size, light weight, high efficiency, energy saving, inc1uding the past almost all the advantages of the lift. Is the latest elevator drive system
Operation in vertical lift, there is also the starting point of the terminus station. For more than three-story elevator buildings, the starting point of the terminal stations and stops between the had not, the starting point for these stations at the first floor of the terminal located at the highest floor. Starting point in the first floor of the station known as base stations, known as the starting point at both ends of the terminal stations and stations at both ends of intermediate stops between stations.
Outside the station has a call box, box set are used by staff for elevator call button or touch the call button, the general ends of the lift stations in the call box on the Settings button or touch of a button. 1iddle layer of the station set up the call box button or touch button 2. No drivers for the control of elevators, at various stations are set up calls me on a button or touch button. Elevator car and the internal settings (except for debris elevator) to manipulate me. Control box switch on the handle or set up stations and the corresponding layer of buttons or touch-button control box on the touch-control button or command button or touch the city button. Outside the command button or touch-button issue as the signal outside the command signal, within the command button or touch-button issue within the signal as a command signal. 80 In the mid-20th century, the touch button has been replaced by micro-button.
As the elevator call box outside the base station, in addition to set up a call button or touch button, but a1so set a key switch in order to work the elevator clearance. Drivers or management staff to open the elevator to the base station can wriggle through a dedicated key to the key switch. Close the elevator in place to autocratically cut off the elevator control power supply or power supply.
4. PLC Control Elevator Design.
With the continuous development of urban construction, the increasing high-rise buildings, elevators and life in the national economy has a broad application. Elevator high-rise buildings as a means of transport in the vertical run of daily life have been
inextricably linked with people. In fact the lift is based on external call control signals, as well as the laws of their own, such as running, and the cal1 is random, the lift is actually a man-machine interactive control system, simple to use control or logic control order can not meet the control requirement, and therefore, elevator control system uses a random control logic. Elevator control is current1y generally used in two ways, first, the use of computer as a signal control unit, the completion of the lift signal acquisition, operation and function of the se, to achieve the lift and set the autocratic scheduling function to run the election, drag the control from inverter to complete; the second control mode with programmable logic controller (PLC) to replace the computer control signal sets the election. From the control and performance, these two types of methods and there is no significant difference. Most of the domestic manufacturers to choose the second approach, because the smaller scale of production there design and manufacture of high cost of computer control devices; and PLC high reliabi1ity, convenient and flexible program design, anti-interference ability, stable and reliable operation of the characteristics of Therefore, the elevator control system is now widely used to realize programmable control.
5. Lift control system.
Lift control system is used to manipulate each control process by managing such commands as running direction, car call, landing call, load signal, landing indication, safety protection.
Lifts in different applications have different load, speed and drive / control modes. Lifts in same application may also have different control mode. Whatever control mode is adopted, the objective is the same, to be specific, according to car call and landing call, lift control system will execute automatic logic judgment to determine which lift will receive signal, which direction lift will run towards and complete programmed control objective through electrical automatic system based on command.
Types of lift control system.
Control system development chronicle indicates that there has appeared many control modes, such as such as relay control, PLC, single computer control, multiple-computer control. Prevailing in different era, these control modes are still employed in lifts now due to massive integrated circuit and computer technology development.
PLC control system.
As abbreviation of programmable logic controller, PLC is an electronic system featuring digital computation. It adopts programmable EPROM to execute logic computation, order control, timing, number counting, arithmetic computation, besides, it can input and output through digital or analogy modes.
The mechanism of PLC control is as follows: input of PLC includes such command signals, as power key to home landing, car call, landing call, various safety switches, position signal, while output of PLC includes contactor, relay, indicators of car / landings and communication unitary, indicators inside car and switch, position signal, are input to PC, while other executing com.
Programming principle is determined by lift control mode. Programming can either be made according to relay logic control circuit or individually in different phases according to lift control functions after completely separating from relay control circuit. Based on the ready made control circuit, the former is simple and easy to master, while the latter involves less programs by integrating programs of small function.
Used in lift control system, PLC has such advantages, as high reliability, stability, easy programming, user-friendliness, convenient maintenance & inspection.
Nowadays, there is a wide range and series of programmable logic controllers. Input / output points range from 30 to 8000 or above, so as to meet lift control requirements with different landing number.
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PLC 控制下的电梯系统
由继电器组成的顺序控制系统是最早的一种实现电梯控制的方法。

但是 ,进入九十年代 ,随着科学技术的发展和计算机技术的广泛应用 ,人们对电梯的安全性、可靠性的要求越来越高 ,继电器控制的弱点就越来越明显。

电梯继电器控制系统故障率高 ,大大降低了电梯的可靠性和安全性 ,经常造成停梯 ,给乘用人员带来不便和惊忧。

且电梯一旦发生冲顶或蹲底 ,不但会造成电梯机械部件损坏 ,还可能出现人身事故。

可编程序控制器（PLC）最早是根据顺序逻辑控制的需要而发展起来的 ,是专门为工业环境应用而设计的数字运算操作的电子装置。

鉴于其种种优点 ,目前电梯的继电器控制方式己逐渐被PLC控制所代替。

同时 ,由于电机交流变频调速技术的发展 ,电梯的拖动方式己由原来直流调速逐渐过渡到了交流变频调速。

因此 ,PLC控制技术加变频调速技术己成为现代电梯行业的一个热点。

1.PLC控制电梯的优点：
（1）在电梯控制中采用了PLC用软件实现对电梯运行的自动控制,可靠性大大大提高。

（2）去掉了选层器及大部分继电器 ,控制系统结构简单 ,外部线路简化。

（3）PLC 可实现各种复杂的控制系统 ,方便地增加或改变控制功能。

（4）可进行故障自动检测与报警显示 ,提高运行安全性 ,并便于检修。

（5）用于群控调配和管理 ,并提高电梯运行效率。

（6）更改控制方案时不需改动硬件接线。

2.电梯变频调速控制的特点：
随着电力电子技术、微电子技术和计算机控制技术的飞速发展 ,交流变频调速技术的发展也十分迅速。

电动机交流变频调速技术是当今节电、改善工艺流程以提高产品质量和改善环境、推动技术进步的一种主要手段。

变频调速以其优异的调速性能和起制动平稳性能、高效率、高功率因数和节电效果 ,广泛的适用范围及其它许多优点而被国内外公认为最有发展前途的调速方式。

交流变频调速电梯的特点：
（1）能源消耗低。

（2）电路负载低 ,所需紧急供电装置小。

在加速阶段 ,所需起动电流小于2.5 倍的额定电流。

且起动电流峰值时间短。

由于起动电流大幅度减小 ,故功耗和供电缆线直径可减小很多。

所需的紧急供电装置的尺寸。