基于PLC的电梯控制系统设计中英文翻译部分 - 副本

本科毕业设计（论文）

中英文对照翻译

院（系部）

电气工程与自动化

专业名称

电气工程及其自动化

年级班级

学生姓名

指导老师

2013

年

6

月< /p>

1

日

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.

The

PLC

biggest

characteristics

lie

in:

The

electrical

engineering teacher already no longer electric hardware up too many calculations of cost, as

long as order the importation that the button switch or the importation of the sensors order to

link the PLC up can solve problem, pass to output to order the conjunction contact machine or

control the start equipments of the big power after the electric appliances, but the exportation

equipments direct conjunction of the small power can.

PLC internal containment have the CPU of the CPU, and take to have an I/ O for expand

of exterior to

connect

a people's address

and saving machine three big pieces to

constitute,

CPU core is from an or many is tired to add the machine to constitute, mathematics that they

have the logic operation ability, and can read the procedure save the contents of the machine

to drive the homologous saving machine and I/ Os to connect after pass the calculation; The I/

O add inner part is tired the input and output system of the machine and exterior link, and

deposit the related data into the procedure saving machine or data saving machine; The saving

machine can deposit the data that the I/ O input in the saving machine, and in work adjusting

to

become

tired

to

add

the

machine

and

I/

O

to

connect,

saving

machine

separately

saving

machine RAM of the procedure saving machine ROM and dates, the ROM can do deposit of

the

data

permanence

in

the

saving

machine,

but

RAM

only

for

the

CPU

computes

the

temporary calculation usage of hour of buffer space.

1

The PLC anti- interference is very and excellent, our root need not concern its service

life and the work situation bad, these all problems have already no longer become the topic

that we fail, but stay to our is a concern to come to internal resources of make use of the PLC

to strengthen the control ability of the equipments for us, make our equipments more gentle.

PLC language is not we imagine of edit collected materials the language or language of

Cs to carry on weaving the distance, but the trapezoid diagram that the adoption is original

after the electric appliances to control, make the electrical engineering teacher while weaving

to write the procedure very easy comprehended the PLC language, and a lot of non- electricity

professional also very quickly know and go deep into to the PLC.

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

2

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

3

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

4