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HIMA Z7136控制模塊工控卡件現(xiàn)貨

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HIMA Z7136控制模塊工控卡件現(xiàn)貨

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HIMA Z7136控制模塊工控卡件現(xiàn)貨 HIMA Z7136控制模塊工控卡件現(xiàn)貨
瑞昌明盛進(jìn)出口貿(mào)易有限公司
主營(yíng)DCS控制系統(tǒng)備件，PLC系統(tǒng)備件及機(jī)器人系統(tǒng)備件，
優(yōu)勢(shì)品牌：Allen Bradley、BentlyNevada、ABB、Emerson Ovation、Honeywell DCS、Rockwell ICS Triplex、FOXBORO、Schneider PLC、GE Fanuc、Motorola、HIMA、TRICONEX、Prosoft等各種進(jìn)口工業(yè)零部件
HIMA Z7136控制模塊工控卡件現(xiàn)貨 HIMA Z7136控制模塊工控卡件現(xiàn)貨 HIMA Z7136控制模塊工控卡件現(xiàn)貨

HIMA Z7136控制模塊工控卡件現(xiàn)貨

 一次線路圖1(單臺(tái)變頻驅(qū)動(dòng)) 由于一套裝置中采用了較多的變頻器，因此變頻器產(chǎn)生的諧波問(wèn)題就比較突出。為此在變頻器輸入側(cè)和輸出側(cè)均安裝了交流電抗器。輸入電抗器主要起抑制諧波對(duì)電網(wǎng)的污染并有效地改善功率因數(shù)的作用。輸出側(cè)電抗器則主要起抑制高次諧波的作用。變頻器輸出電壓中包含的高次諧波有兩個(gè)不利的影響:一是干擾弱點(diǎn)控制系統(tǒng)，二是在較長(zhǎng)的電纜中產(chǎn)生漏電流，這個(gè)漏電流有時(shí)足以使變頻器無(wú)法運(yùn)行。在沒有輸出濾波電抗器情況下，電機(jī)與變頻器之間的大允許導(dǎo)線長(zhǎng)度在100m左右，而使用輸出濾波電抗器時(shí)這個(gè)長(zhǎng)度可以達(dá)到600~800m。由于聚酯生產(chǎn)裝置往往比較龐大，電機(jī)與變頻器之間的距離都比較遠(yuǎn)，所以為了保險(xiǎn)起見需加裝電抗器。另外，輸出電抗器對(duì)保護(hù)電機(jī)絕緣也有好處。 轉(zhuǎn)貼于 中國(guó)論文下載中心 http://www.s上述一次線路構(gòu)成使用于漿料輸送泵、預(yù)聚物輸送泵、熔體輸送泵、消光劑輸送泵、預(yù)聚反應(yīng)器攪拌器電機(jī)等的變頻驅(qū)動(dòng)。對(duì)于后縮聚反應(yīng)器攪拌器出/入口電機(jī)的變頻驅(qū)動(dòng)來(lái)說(shuō)，由于電機(jī)無(wú)法備用設(shè)備，為了提高可靠性，采用兩套變頻器互為備用的方式，其一次線路圖如圖2所示。
5 控制方案
(1) 變頻器運(yùn)行/停止控制
圖2 一次線路圖2(變頻器互為備用) 聚酯生產(chǎn)過(guò)程是由一套DCS系統(tǒng)來(lái)控制的，因此對(duì)于不同傳動(dòng)部位的運(yùn)行/停止控制是由DCS系統(tǒng)來(lái)監(jiān)控的。另外在傳動(dòng)部位現(xiàn)場(chǎng)設(shè)置有起/停操作柱，可以現(xiàn)場(chǎng)起停變頻裝置。為了保證在電網(wǎng)瞬停故障情況下變頻器的正常操作，變頻器起停信號(hào)保持電源由UPS提供。另外，為了延長(zhǎng)變頻器主要元件的使用壽命，變頻器不運(yùn)行時(shí)其輸入側(cè)接觸器時(shí)斷開的，即變頻器在接收到運(yùn)行指令后才啟動(dòng)輸入接觸器。 (2) 頻率設(shè)定(轉(zhuǎn)速設(shè)定)信號(hào)的給定 DCS操作人員根據(jù)生產(chǎn)需要，在DCS操作室給出頻率(轉(zhuǎn)速)設(shè)定值(DC4~20mA)，該給定值經(jīng)裝置于變頻柜內(nèi)的信號(hào)隔離變換器轉(zhuǎn)變?yōu)镈C0~10V信號(hào)并送入變頻器。 (3) 變頻器運(yùn)行狀態(tài)的監(jiān)視 變頻器的運(yùn)行狀態(tài)包括開關(guān)量和模擬量?jī)煞N，開關(guān)量有:變頻器運(yùn)行(RUN)、故障(FAULT)等;模擬量有:變頻器運(yùn)行頻率、電機(jī)電流、電機(jī)轉(zhuǎn)矩等。 開關(guān)量以干接點(diǎn)的形式送往DCS，模擬量則經(jīng)信號(hào)隔離變換器轉(zhuǎn)變?yōu)?~20mADC標(biāo)準(zhǔn)信號(hào)送給DCS系統(tǒng)。如圖3所示。
圖3 變頻器運(yùn)行狀態(tài)監(jiān)視示意圖 (4) 變頻器備用的控制 對(duì)于后縮聚反應(yīng)器攪拌器電機(jī)，由于有2臺(tái)變頻器需要控制，并且要求在一臺(tái)變頻器運(yùn)行中發(fā)生故障時(shí)能迅速切換到另一臺(tái)備用變頻器繼續(xù)運(yùn)行，涉及的控制比較復(fù)雜，為此設(shè)置一套
PLC
系統(tǒng)來(lái)承擔(dān)控制任務(wù)。PLC實(shí)時(shí)監(jiān)測(cè)兩臺(tái)變頻器的狀況，在運(yùn)行變頻器出故障時(shí)，根據(jù)預(yù)設(shè)的控制程序自動(dòng)啟動(dòng)備用變頻器，同時(shí)切換相應(yīng)的開關(guān)量和模擬量。為了保證PLC故障情況下能起用變頻器，另設(shè)置應(yīng)急開關(guān)一套，此開關(guān)允許啟動(dòng)主機(jī)或備機(jī)，但不具備自動(dòng)切換功能。
6 結(jié)束語(yǔ)
上述聚酯裝置變頻調(diào)速系統(tǒng)已先后在遼化聚酯廠、浙化聚酯裝置中成功應(yīng)用，運(yùn)行情況良好。完全滿足生產(chǎn)工藝的要求。與成套引進(jìn)的系統(tǒng)相比較，具有如下明顯優(yōu)點(diǎn):(1)造價(jià)大為降低。成套引進(jìn)同類設(shè)備的價(jià)格在我們自行設(shè)計(jì)制造設(shè)備價(jià)格的2~5倍左右;(2)可維護(hù)性大大提高。成套引進(jìn)的設(shè)備往往備件價(jià)格極其昂貴，售后服務(wù)費(fèi)用很高，而且很難及時(shí)周到。由于我們選用的變頻器及其外圍元件均是國(guó)內(nèi)市場(chǎng)上很容易采購(gòu)到的，因而可大大降低運(yùn)行維護(hù)費(fèi)用。 Se cigarette part and max filter assembly. Its control system is composed of several small control systems that are independent and related to each other. Its functions are relatively concentrated. Figure 1.1 shows the distribution diagram of its control system (top view). As can be seen from the figure, the original control system is embedded in the whole production line and distributed around the production line, which is convenient for inspection and maintenance. The interconnection between each part of the control system is routed from the inside of the machine; Many sensors and actuators are irregularly distributed in all parts of the whole production line. There are air switches, contactors, circuit breakers and relays inside each control cabinet (except the cabinet where the electronic control card is placed). Most of the relays are used to realize simple logic functions (such as interlocking, interlocking, etc.). Only a few relays are reserved in the new design. The control logic is realized by PLC. The extra space after removing the relay is used as the sub site for PLC, PLC sub station mainly includes communication module, input and output module and special function module. The original control system is embedded into the machine, and each cabinet has been treated with corresponding ventilation and dust prevention. However, with the passage of time, the dust in the cabinet is still accumulating more and more, the temperature in the cabinet is always maintained at a relatively high level, and the circuit board in the control system is not specially protected. The circuit board works in a high temperature and dusty environment all year round, which accelerates the aging of electronic components and reduces the stability of the whole control system. When using PLC control system, we remove the electronic control card of the original control system, and its function is realized by PLC. The central processor of PLC is placed in a newly added control cabinet, which is conducive to the improvement of the stability of the control system. The original control system mainly adopts three power supply modes: 1. The main power supply adopts TN-S three-phase five wire AC power distribution: transformer and main power supply

electric machinery

, fan, oil pump, paper tray rotation motor, etc. provide electric energy; 2. Single phase AC power