描述
交流電源的不正常主要是指欠壓、缺相和停電事故三種情況,有時(shí)是幾種情況的復(fù)合。電源故障的最重要原因是遭受雷擊,其次是供電系統(tǒng)的短路事故。有些地區(qū),因電力供應(yīng)不足采取自備發(fā)電機(jī)發(fā)電,則電壓波動(dòng)、頻率波動(dòng)的問題更易產(chǎn)生。但大多數(shù)事故是短暫發(fā)生(一般為數(shù)秒),一旦電源恢復(fù)正常,設(shè)備繼續(xù)運(yùn)轉(zhuǎn)。這時(shí),變頻器應(yīng)具備瞬時(shí)停電再起動(dòng)功能。具體對(duì)策如下。
①停電時(shí)間較長(zhǎng),變頻器附近又有直接起動(dòng)的電動(dòng)機(jī)或電爐的情況下,當(dāng)電網(wǎng)電壓降低時(shí),一般將變頻器從電源切除。
②停電是瞬時(shí)性的,設(shè)備要求連續(xù)運(yùn)轉(zhuǎn),這時(shí)對(duì)變頻器提出了較高要求。首先要了解拖動(dòng)負(fù)載的電動(dòng)機(jī)減速特性,用測(cè)速發(fā)電機(jī)測(cè)出在起動(dòng)時(shí)實(shí)際的轉(zhuǎn)速。這種控制稱為變頻器的瞬時(shí)停電再起動(dòng)功能。
③特別重要的設(shè)備,絕對(duì)不容許停轉(zhuǎn),而必須采用不停電電源(UPS)與變頻器自動(dòng)換接。
還有一種特殊情況是如果電源產(chǎn)生缺相,也能讓變頻器短時(shí)單相運(yùn)行。這時(shí),要不斷檢測(cè)整流器的過流狀況和電流紋波增大后對(duì)變頻器的可靠性與壽命的影響。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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LAM/BAY ADVANCED CYLINDER LIFTER 853-011661-001
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MAC Valves SOLENOID VALVE 5 3 WAY VALVES 20S CO11100120
Schumacher EMO Controller board 1730-3006 Rev.H
Allen-Bradley 32 Point Sourcing Input Card KC-1746-IB32
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Mykrolis Filter Intercept 0.2um,10″IHAG01P01K
Vero Power Supply,New,PK-120
MILLIPORE 10″FILTER CARTRIDGE,CTFA01P01
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