基于plc电梯控制外文文献翻译、中英文翻译、外文翻译

外文资料翻译

1 In the article has analyzed the elevator loadcharacteristics, elaborated uses the

trapezoid acceleration curve theelevator ideal velocity curve, unifies the frequency

changer and thePLC performance, elaborated the elevator control system

constitutionand the operational factor. Elaborated the elevator speed curveproduces

the method, has induced the characteristic which designs byPLC constitution control

system software.

Key word: Load characteristics ideal velocity curve control systemsoftware

design

1. Outline

Along with the urban construction unceasing development, thehigh-rise

construction unceasingly increases, the elevator has thewidespread application in the

national economy and the life. Theelevator took in the high-rise construction the

vertical movementtransportation vehicle already and people's daily life is

inseparable.In fact the elevator is according to exterior movement and so oncalling

signal as well as own control rule, but calls is stochastic,the elevator is a person

machine interactive control system in fact,purely is cannot satisfy the control request

with the sequentialcontrol or the logical control, Therefore, the elevator control

system uses the stochastic logical waycontrol. At present the elevator control

generally has selected twomethods, one is uses the microcomputer to take the signal

controlunit, completes the elevator signal gathering, the running status andthe

function hypothesis, realizes the elevator automatic dispatch andthe collection

chooses the movement function, drives the control tocomplete by the frequency

changer; The second control mode (PLC)substitutes for the microcomputer realization

signal collection withthe programmable controller to choose the control. Said from the

control mode and the performance, these two methodscertainly not too big difference.

The domestic factory mostly choosesthe second way, its reason lies in the production

scale slightly, owndesign and the manufacture microcomputer control device cost

ishigher; But PLC reliability high, programming convenience nimble, theantijamming

ability strong, the movement stable is reliable and so onthe characteristic, therefore

the present elevator control systemwidely uses the programmable controller to realize.

2. Elevator ideal performance diagram 外文资料翻译

2 Indicated according to the massive research and the experiment, theperson may

accept the maximum acceleration is am <= 1.5m/s2,acceleration rate of change rho m

<= the 3m/s3, elevator idealperformance diagram may divide according to the

acceleration is thetriangle, the trapezoid and the sine profile, As a result of sine profile

acceleration curve realization moredifficult, but the triangle curve maximum

acceleration and is startingand applies the brake the section turning point acceleration

rate ofchange to be bigger than the trapezoidal curve, namely + rho m jumpsto - rho m

or jumps from - rho m to + rho the m acceleration rate ofchange, therefore very little

uses, because the trapezoidal curve iseasy to realize and has the good acceleration rate

of change frequenttarget, therefore is widely used, uses the trapezoidal

accelerationcurve elevator ideal performance diagram like chart 1 to show:

The intelligent frequency changer is for the elevator special-purposefrequency

changer request and so on elevator nimble velocitymodulation, control and high

accuracy even level which but speciallydesigns, may use for parts the general

three-phase asynchronous motor,and has function and so on intellectualized software,

standardconnection, menu prompt, input elevator curve and other essentialparameter.

It has the debugging convenience quickly, moreover can automaticallyrealize the

single multilayered function, and has the automaticoptimization deceleration curve the

function, is composed the velocitymodulation system crawling time by it few, the

even level distance isshort, no matter is the double winding electric motor, or electric

motor suitable, its highest design speed may reach 4m/s, itsunique computer

monitoring software, may choose the serial interfacerealization input/output signal the

non- electronic contact control. The frequency changer constitutes elevator system,

when the frequencychanger receives the controller to send out shouts the

ladderdirection signal, the frequency changer basis hypothesis speed and

theacceleration value, the starting motor, after achieved the maximumspeed, the

uniform speed moves, when arrives the goal leveldecelerates, the controller sends out

shuts off the high velocitysignal, reduces the speed which the frequency changer