外文翻译

The supervising system of elevator base on PLC

1. Nessicery of the comtent and general situation

Coming into 90’s,with the development of technology and the abroad

application of computer ,people require more secure and reliable of the elevator,the
failing of relay control becomes more evident.PLC has developed basing on the
need of the order logical control,it is a electronic device of numeral operation.
Whereas its variety virtue, now the relay control mode has been replaced by PLC
gradually at the same time, because of the development of the technology has
gradually transited to AC frequency conversion speeding.So the technology of PLC
adding frequency speeding has became one hotspot in modern elevator industry.

PLC is a expert computer using for automatic control, virtually it belongs to

computer control mode. PLC control commonly has such point as high
reliability 、easy to operate、simple to maintain and program, strong agility and so
on .

Using PLC control and software to realize auto-control of elevator, reliability

is improved greatly. Structure of the system is simple and its external line is
predigested, In addition, the function can be increased or changed expendently.
Also trouble can be automatic checked and alarming can be showed, security of
moving is improved and examining and repairing is convenient.

With the rapid development of electronic technology, micro-electronic

technology and computer technology, the development of Acfrequency conversion
speeding is also rapid, The AC frepuency conversion speeding of electromotor is a
main measure of saving electricity 、 improving arts and crafts flow to improve
quality of the product、amending circumstance and driving technology to go-ahead.
Frequency conversion speeding is considered having developing future best of all
because of its excellent timing capability and starting and stopping capability, high
efficiency, high power factor and affection of saving electricity, broad applying
range and other many strongpoint.

Elevator of Frequency conversion speeding using advanced SPWM

technology, amends moving quality and capability of elevator apparently, its timing
range is vast and precision is high , dynamic of elevator apparently, its timing range
is vast and precision is high, dynamic capability is good, comfort, quiet, shortcut ,
it nearly can compare beauty with clectromotor of DC .Simultaneity it improves
quality of the power supply, reduces resonance wave, improves efficiency and
power factor, saves electricity obviously.