變頻(pin)器MDX61B0450-503-4-0T

變頻器MDX61B0450-503-4-0T

中海德(de)（福建）工(gong)業設備(bei)有限公司(si)是(shi)一家綜合性貿易公司(si)，從事(shi)歐美(mei)(mei)工業自(zi)動(dong)化設備及配件。主要經營來自(zi)歐洲，美(mei)(mei)國，日本等(deng)國電氣、液壓、機(ji)械(xie)傳動(dong)、儀器儀表(biao)、工具等(deng)。主要有(you) SEW，AB，ABB，施耐(nai)德，泰道，西門子，霍尼韋(wei)爾(er)，力(li)士樂，MOOG，SMC等。主(zhu)營產品有從事國外的(de)工控(kong)自動化產品進出口貿(mao)易，主(zhu)要經營歐美傳(chuan)感器(qi)，編碼器(qi)，泵(beng)閥，電機伺(si)服，過濾設備(bei)等。

中(zhong)海(hai)德（福建）工業設備有限公司  

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過壓類(lei)故障

變頻器的過電(dian)壓(ya)集中表現在(zai)直流(liu)母線的支(zhi)流(liu)電(dian)壓(ya)上。正常情況下，變頻器直流(liu)電(dian)為三相:全波整流后的平均值。若(ruo)以380V線電(dian)(dian)壓(ya)計算，則平均直流電(dian)(dian)壓(ya)Ud=1.35 U線=513V。 在過(guo)電(dian)(dian)壓(ya)發生時(shi)，直流母線的儲能(neng)電(dian)(dian)容將被充電(dian)(dian)，當(dang)(dang)電(dian)(dian)壓(ya)上至(zhi)760V左(zuo)右(you)時(shi)，變(bian)頻器過(guo)電(dian)(dian)壓(ya)保護動作。因此，變(bian)頻器來說，都有(you)一個(ge)正常的工作電(dian)(dian)壓(ya)范圍,當(dang)(dang)電(dian)(dian)壓(ya)超過(guo)這個(ge)范圍時(shi)很(hen)可能(neng)損(sun)壞變(bian)頻器，常見的過(guo)電(dian)(dian)壓(ya)有(you)兩類。

1、輸入交流電源過壓

這種情況是指輸入電壓超過正常(chang)范圍，一般發生在節假(jia)日負(fu)載較輕，電壓升高或(huo)降低而線(xian)路(lu)出(chu)現故障，此(ci)時(shi)好斷開電源，檢查、處理(li)。

2、發電(dian)類過(guo)電(dian)壓故(gu)障

這種情(qing)況(kuang)出(chu)現(xian)的概率較高(gao)，主要是電機的同(tong)步(bu)轉速比實際轉速還高(gao)，使電動機處于發電狀態，而變頻器又(you)沒有(you)安裝(zhuang)制動單元，有(you)兩(liang)起情(qing)況(kuang)可(ke)以引起這一故障。

(1)當(dang)變(bian)(bian)頻(pin)器(qi)(qi)拖動大慣性負(fu)載(zai)時(shi)，其減(jian)速(su)時(shi)間設的比(bi)(bi)較小，在(zai)減(jian)速(su)過(guo)(guo)(guo)程(cheng)中，變(bian)(bian)頻(pin)器(qi)(qi)輸(shu)出的速(su)度比(bi)(bi)較快(kuai)，而(er)(er)負(fu)載(zai)靠(kao)本身阻力減(jian)速(su)比(bi)(bi)較慢，使負(fu)載(zai)拖動電(dian)(dian)(dian)動機(ji)的轉(zhuan)速(su)比(bi)(bi)變(bian)(bian)頻(pin)器(qi)(qi)輸(shu)出的頻(pin)率(lv)所(suo)對應的轉(zhuan)速(su)還要高，電(dian)(dian)(dian)動機(ji)處于發(fa)電(dian)(dian)(dian)狀(zhuang)態(tai)，而(er)(er)變(bian)(bian)頻(pin)器(qi)(qi)沒有能(neng)量(liang)(liang)回(hui)(hui)饋單元(yuan)，因而(er)(er)變(bian)(bian)頻(pin)器(qi)(qi)支(zhi)流(liu)直流(liu)回(hui)(hui)路(lu)電(dian)(dian)(dian)壓升高，超(chao)出保護值，出現故(gu)障(zhang)，而(er)(er)中經(jing)常發(fa)生(sheng)(sheng)(sheng)在(zai)干燥部分，處理這(zhe)種(zhong)故(gu)障(zhang)可以增加再生(sheng)(sheng)(sheng)制(zhi)動單元(yuan)，或者修改變(bian)(bian)頻(pin)器(qi)(qi)參數,把變(bian)(bian)頻(pin)器(qi)(qi)減(jian)速(su)時(shi)間設的長--些(xie)。增加再生(sheng)(sheng)(sheng)制(zhi)動單元(yuan)功(gong)能(neng)包括能(neng)量(liang)(liang)消耗型(xing)(xing)，并(bing)(bing)聯(lian)(lian)直流(liu)母(mu)線(xian)吸(xi)(xi)收(shou)型(xing)(xing)、能(neng)量(liang)(liang)回(hui)(hui)饋型(xing)(xing)。能(neng)量(liang)(liang)消耗型(xing)(xing)在(zai)變(bian)(bian)頻(pin)器(qi)(qi)直流(liu)回(hui)(hui)路(lu)中并(bing)(bing)聯(lian)(lian)一(yi)-個(ge)制(zhi)動電(dian)(dian)(dian)阻，通(tong)過(guo)(guo)(guo)檢測直流(liu)母(mu)線(xian)電(dian)(dian)(dian)壓來控(kong)制(zhi)功(gong)率(lv)管的通(tong)斷。并(bing)(bing)聯(lian)(lian)直流(liu)母(mu)線(xian)吸(xi)(xi)收(shou)型(xing)(xing)使用(yong)在(zai)多電(dian)(dian)(dian)機(ji)傳動系統(tong)，這(zhe)種(zhong)系統(tong)往往有一(yi).臺或幾機(ji)經(jing)常工作于發(fa)電(dian)(dian)(dian)狀(zhuang)態(tai)，產(chan)生(sheng)(sheng)(sheng)再生(sheng)(sheng)(sheng)能(neng)量(liang)(liang)，這(zhe)些(xie)能(neng)量(liang)(liang)通(tong)過(guo)(guo)(guo)并(bing)(bing)聯(lian)(lian)母(mu)線(xian)被處于電(dian)(dian)(dian)動狀(zhuang)態(tai)的電(dian)(dian)(dian)機(ji)吸(xi)(xi)收(shou)。能(neng)量(liang)(liang)回(hui)(hui)饋型(xing)(xing)的變(bian)(bian)頻(pin)器(qi)(qi)網側變(bian)(bian)流(liu)器(qi)(qi)是可逆(ni)的，當(dang)有再生(sheng)(sheng)(sheng)能(neng)量(liang)(liang)產(chan)生(sheng)(sheng)(sheng)時(shi)可逆(ni)變(bian)(bian)流(liu)器(qi)(qi)就將再生(sheng)(sheng)(sheng)能(neng)量(liang)(liang)回(hui)(hui)饋給電(dian)(dian)(dian)網。

(2)多(duo)個電(dian)(dian)(dian)(dian)動(dong)施動(dong)同(tong)一(yi)(yi)個負(fu)(fu)載(zai)時(shi)，也可能出現(xian)這(zhe)一(yi)(yi).故(gu)障， 主要由于(yu)沒(mei)有(you)負(fu)(fu)荷(he)分(fen)(fen)配引起(qi)的(de)。以兩臺電(dian)(dian)(dian)(dian)動(dong)機(ji)拖動(dong)-一(yi)(yi)個 負(fu)(fu)載(zai)為例(li)，當一(yi)(yi)臺電(dian)(dian)(dian)(dian)動(dong)機(ji)的(de)實(shi)際轉速(su)(su)大于(yu)另一(yi)(yi)臺電(dian)(dian)(dian)(dian)動(dong)機(ji)的(de)同(tong)步轉速(su)(su)時(shi)，則轉速(su)(su)高的(de)電(dian)(dian)(dian)(dian)動(dong)機(ji)相當于(yu)原(yuan)動(dong)機(ji)，轉速(su)(su)低的(de)處于(yu)發(fa)電(dian)(dian)(dian)(dian)狀態，引起(qi)故(gu)障。在紙(zhi)機(ji)經常發(fa)生在榨部及網(wang)部，處理時(shi)需加負(fu)(fu)荷(he)分(fen)(fen)配控制。可以把處于(yu)紙(zhi)機(ji)傳(chuan)動(dong)速(su)(su)度鏈分(fen)(fen)支的(de)變頻器(qi)特性調節軟(ruan)一(yi)(yi)些。

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