The Development of Passenger Lift Technology

Update:2019-11-06
Summary:

With the continuous development of urban construction, the rapid rise of the city and the continuous increase of high-rise buildings, elevators, as the means of transport for vertical operation in high-rise buildings, have become inextricably linked […]

With the continuous development of urban construction, the rapid rise of the city and the continuous increase of high-rise buildings, elevators, as the means of transport for vertical operation in high-rise buildings, have become inextricably linked with people's daily life. It is the use of electric drag, will carry passengers or cargo car, running in the vertical direction between the two rigid rails, transport passengers and cargo fixed lifting equipment. Therefore, the passenger elevator is a high-rise building transportation services equipment, it has the advantages of fast delivery, safe, reliable, easy to operate. However, the traditional elevator control system mainly uses the relay-contactor to control. The disadvantages are many contacts, high failure rate, poor reliability and large maintenance workload. The PLC control system can solve the above problems , make the Passenger Lift run more safe, convenient and comfortable.

At present, the passenger elevator control generally adopts two methods. One is to use the microcomputer as the signal control unit to complete the collection of the elevator signal, the setting of the operating status and functions, and the automatic dispatch and set-selection operation function of the elevator. The drag control is controlled by Inverter to complete; The second control method using programmable logic controller to replace the computer signal control. From the control mode and performance, the two methods are not much different, but PLC reliability, programming convenient and flexible.

PLC is a dedicated computer for industrial automation. In essence, computer control. PLC and common computer, can be general or special CPU as a word processor, channel (word) operation and data storage, in addition to a bit processor (Boolean processor), point (bit) computing and control. PLC control generally has high reliability, easy operation, maintenance and programming simple, flexible and so on.

The PLC operation includes program input and program change operation. Most PLCs use programmers for input and change operations. The programmer at least provides the input information display, for large and medium-sized PLC, the programmer uses a CRT screen display, therefore, the program input can be displayed directly. Change the program operation can also be directly based on the required address number or contact number to search or order to find, and then change, change the information can be displayed on the LCD screen or CRT.