變(bian)頻(pin)器MDX61B0450-503-4-0T

變頻器MDX61B0450-503-4-0T

中海(hai)德（福(fu)建）工(gong)業設備有限公(gong)司是一(yi)家綜合性貿易公(gong)司，從(cong)事歐(ou)美工業自動化設備及配件。主(zhu)要經(jing)營來自歐(ou)洲，美國，日本(ben)等國電氣、液(ye)壓、機械傳動、儀器儀表、工具等。主要有 SEW，AB，ABB，施耐(nai)德，泰道，西門子，霍尼韋爾，力士樂，MOOG，SMC等。主(zhu)營產品有(you)從事國外的工控自動化產品進出口(kou)貿易，主(zhu)要(yao)經營歐美傳(chuan)感器，編碼器，泵閥，電機伺服，過濾設備等。

中海德（福建）工業設備有(you)限公司  

聯系(xi)人：田小(xiao)華

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過壓類故(gu)障

變頻(pin)器的(de)過電壓集中表現在(zai)直流母線的(de)支(zhi)流電壓上。正常情況下，變頻(pin)器直流電為三相:全波整流后的(de)平(ping)均(jun)值。若以380V線電(dian)(dian)壓計(ji)算，則平(ping)均(jun)直流電(dian)(dian)壓Ud=1.35 U線=513V。 在過電(dian)(dian)壓發生(sheng)時(shi)，直流母(mu)線的(de)儲能電(dian)(dian)容將被充電(dian)(dian)，當電(dian)(dian)壓上至760V左(zuo)右(you)時(shi)，變頻器(qi)過電(dian)(dian)壓保(bao)護(hu)動作。因此，變頻器(qi)來說，都有一(yi)個正常的(de)工作電(dian)(dian)壓范(fan)圍(wei),當電(dian)(dian)壓超過這個范(fan)圍(wei)時(shi)很可能損壞變頻器(qi)，常見(jian)的(de)過電(dian)(dian)壓有兩類。

1、輸入交流電源過(guo)壓

這種情況是指(zhi)輸入電(dian)壓超過正常范圍，一般發生(sheng)在節假(jia)日負載較輕，電(dian)壓升高或降低而線(xian)路出(chu)現(xian)故障，此時好斷開電(dian)源，檢查、處(chu)理。

2、發(fa)電類過電壓故(gu)障(zhang)

這種(zhong)情(qing)況出現的概率較高，主要是(shi)電機(ji)(ji)的同步轉(zhuan)速比實際轉(zhuan)速還(huan)高，使電動(dong)機(ji)(ji)處于發電狀(zhuang)態，而變頻器又沒有(you)(you)安裝制動(dong)單元，有(you)(you)兩起情(qing)況可以引(yin)起這一故障(zhang)。

(1)當(dang)變(bian)(bian)(bian)頻(pin)器(qi)拖(tuo)動(dong)(dong)大慣性負載(zai)時，其減(jian)速(su)時間(jian)設(she)的(de)(de)(de)比(bi)較(jiao)小，在(zai)減(jian)速(su)過(guo)程中(zhong)(zhong)，變(bian)(bian)(bian)頻(pin)器(qi)輸(shu)出(chu)(chu)的(de)(de)(de)速(su)度比(bi)較(jiao)快，而(er)負載(zai)靠本身阻力減(jian)速(su)比(bi)較(jiao)慢，使(shi)負載(zai)拖(tuo)動(dong)(dong)電(dian)動(dong)(dong)機的(de)(de)(de)轉速(su)比(bi)變(bian)(bian)(bian)頻(pin)器(qi)輸(shu)出(chu)(chu)的(de)(de)(de)頻(pin)率(lv)所對(dui)應的(de)(de)(de)轉速(su)還(huan)要高，電(dian)動(dong)(dong)機處(chu)于(yu)發(fa)電(dian)狀(zhuang)(zhuang)態，而(er)變(bian)(bian)(bian)頻(pin)器(qi)沒有(you)能量(liang)(liang)回(hui)饋(kui)單(dan)(dan)元，因而(er)變(bian)(bian)(bian)頻(pin)器(qi)支流(liu)直流(liu)回(hui)路電(dian)壓升高，超出(chu)(chu)保護值，出(chu)(chu)現故障(zhang)，而(er)中(zhong)(zhong)經(jing)常發(fa)生(sheng)在(zai)干燥(zao)部分，處(chu)理這(zhe)種故障(zhang)可(ke)(ke)(ke)以增加再生(sheng)制動(dong)(dong)單(dan)(dan)元，或者修改變(bian)(bian)(bian)頻(pin)器(qi)參(can)數,把(ba)變(bian)(bian)(bian)頻(pin)器(qi)減(jian)速(su)時間(jian)設(she)的(de)(de)(de)長--些。增加再生(sheng)制動(dong)(dong)單(dan)(dan)元功(gong)能包(bao)括能量(liang)(liang)消耗(hao)型(xing)，并(bing)聯(lian)直流(liu)母(mu)(mu)線(xian)吸(xi)收型(xing)、能量(liang)(liang)回(hui)饋(kui)型(xing)。能量(liang)(liang)消耗(hao)型(xing)在(zai)變(bian)(bian)(bian)頻(pin)器(qi)直流(liu)回(hui)路中(zhong)(zhong)并(bing)聯(lian)一-個制動(dong)(dong)電(dian)阻，通(tong)過(guo)檢(jian)測直流(liu)母(mu)(mu)線(xian)電(dian)壓來控制功(gong)率(lv)管的(de)(de)(de)通(tong)斷。并(bing)聯(lian)直流(liu)母(mu)(mu)線(xian)吸(xi)收型(xing)使(shi)用在(zai)多(duo)電(dian)機傳動(dong)(dong)系統，這(zhe)種系統往(wang)往(wang)有(you)一.臺或幾(ji)機經(jing)常工(gong)作于(yu)發(fa)電(dian)狀(zhuang)(zhuang)態，產生(sheng)再生(sheng)能量(liang)(liang)，這(zhe)些能量(liang)(liang)通(tong)過(guo)并(bing)聯(lian)母(mu)(mu)線(xian)被處(chu)于(yu)電(dian)動(dong)(dong)狀(zhuang)(zhuang)態的(de)(de)(de)電(dian)機吸(xi)收。能量(liang)(liang)回(hui)饋(kui)型(xing)的(de)(de)(de)變(bian)(bian)(bian)頻(pin)器(qi)網側(ce)變(bian)(bian)(bian)流(liu)器(qi)是可(ke)(ke)(ke)逆的(de)(de)(de)，當(dang)有(you)再生(sheng)能量(liang)(liang)產生(sheng)時可(ke)(ke)(ke)逆變(bian)(bian)(bian)流(liu)器(qi)就將(jiang)再生(sheng)能量(liang)(liang)回(hui)饋(kui)給電(dian)網。

(2)多個(ge)電(dian)動(dong)(dong)(dong)(dong)施(shi)動(dong)(dong)(dong)(dong)同一個(ge)負(fu)載時，也可(ke)能(neng)出現這一.故障， 主要由于(yu)沒有(you)負(fu)荷分配引起的(de)(de)(de)。以兩臺電(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)拖動(dong)(dong)(dong)(dong)-一個(ge) 負(fu)載為例，當一臺電(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)的(de)(de)(de)實際轉(zhuan)(zhuan)速(su)大于(yu)另一臺電(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)的(de)(de)(de)同步轉(zhuan)(zhuan)速(su)時，則(ze)轉(zhuan)(zhuan)速(su)高的(de)(de)(de)電(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)相當于(yu)原動(dong)(dong)(dong)(dong)機(ji)(ji)，轉(zhuan)(zhuan)速(su)低的(de)(de)(de)處于(yu)發(fa)電(dian)狀態，引起故障。在(zai)紙機(ji)(ji)經(jing)常發(fa)生在(zai)榨部及網部，處理時需(xu)加負(fu)荷分配控制。可(ke)以把(ba)處于(yu)紙機(ji)(ji)傳動(dong)(dong)(dong)(dong)速(su)度鏈(lian)分支的(de)(de)(de)變頻器特性調節軟一些。

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