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The electric elevator of our country technology has got prompt development few Elevator Factory with the development of science and technology , in recent years, can't depend on improvement design , the modification handicraft ceaseless. Renovation and upgrade produces more late-model electric elevator , the electric elevator divides machinery system and navar mainly liang of major parts, the electric elevator dragging moves way and that very big change , exchange speed regulation happened in control without exception is that the current electric elevator drags the main development direction moving with the fact that autocontrol reasons with development of microelectronics technology. Lift control system has three kinds control modes at present mainly: Succeed circuital navar (electric elevator multidigit relay navar that "early phase assembles) , PLC navar , PC navar. Shortcomings such as relay navar being dispatched because the malfunction leads high reliability , being controlling way no nimbly as well as consumption power is big, already has been sifted out gradually at present. PC navar has stronger function though in the field of intelligent control , existence anti-interference nature difference also , systematic design is complicated but, the personnel who is maintained in general is difficult to grasp it's the defect keeping a technology in repair waiting. PLC navar is strong but because of running reliability height , using the convenient , anti-interference sex being maintained, merit such as designing and testing a period comparatively shortly, be doubly people paid attention to waiting for merit , already has become the technical transformation at present, using the most control mode , being used for tradition relay navar at present also broadly in electric elevator navar. [1] [2] [3] [11] about 70 at present domestic age installation a lot of electric elevator electricity parts use relay contactor navar , the circuit is complicated , connection is more , the malfunction leads high , difficult to keep a maintenance in repair, many already have been in the state being left unused , the person is drug causing system to adopt the system exchanging pair of fast electric motors to change speed , inefficient excessively, the speed regulation function index is relatively poor , affect electric elevator operation quality gravely. Speed regulation is systematic because these electric elevators exchange pressure regulating , the electric motor exchanging pair of speed is drug moving system function and ride in comfort feels a range , the system exchanging pressure regulating speed regulation obj1 = " 位" ? is exchanged the fast mechanical part in order the nothing big problem, economizing on the use of funds by the energy consumption type , the most old-fashioned electric elevator consumer hopes that system carries out the working function reforming , raising an electric elevator on the electric elevator electric control. The technology carries out research on lift control therefore , seeks old-fashioned our country electric elevator suitable's to reform method having very important significance. [4] [5] [13] electric elevators compose in reply with people's job the gradually rapid and intense connection living as important high-rise means of transportation. PLC is the new generation industry controller, taking as an example it's high reliability and technology advanced, get extensive use in lift control , make an electric elevator be a computer-controlled important direction from the tradition relay control mode development thereby, one of the hot spot becoming the current lift control and technical transformation. PLC is one kind of speciality be engaged in the minitype computer system that the logic controls. Characteristics such as strong , designing allocation nimbly because PLC has function stability , the anti-interference ability. Have got extensive use therefore in the field of industrial control. Since the eighties later stage PLC leads into our country electric elevator industry, the lift control system being composed of PLC is adopted commonly by a lot of electric elevator fabrication manufacturer. And have formed the approved product a train of. In systematic tradition relay reconstruction project, PLC system is always that main current controls system. [6] [12] Electric elevator navar is allotted in order the speed regulation part composes in reply logic control section. That speed regulation part function works to the electric elevator is that passenger's comfortable feeling has important effect , logic control section is to be working safe reliable electric elevator key but. For comfortable feeling and working reliability improving an electric elevator, change for the operation using PLC to come to control an electric elevator now, such has improved the electric elevator function greatly. Programming controller (Programmable Logic controller, being called PLC for short) is to take microprocessor as basis, have synthesized computer art and the automation technology but development new generation industry controller. That the adverse circumstances characteristics such as its high temperature , impingement and vibration having reliability height , adapting to the industry scene, already has become the most effective implement resolving the autocontrol problem's, is one of three big pillars of currently advanced industrial automation.

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