;西門子規(guī)范傳動產品供給的MM4系列制動電阻均為5%制動周期的電阻,所以在選型時應加以留意;制動周期在參數P1237中挑選;一起應將P1240設置為0用以禁止直流電壓操控器。
制動周期的核算有時候簡單紊亂。實踐上,5%制動周期就意味著制動電阻能夠在12秒鐘內耗費100%的功率,然后需求冷卻228秒鐘。當然假如制動的時刻小于12秒鐘,或許耗費的功率低于100%是別的一種狀況,變頻器會核算制動電阻的i2t。假如制動周期大于5%,440答應設置較高的制動周期,但實踐上很難精確地核算出制動的狀況。比如說,一臺變頻器每分鐘制動5秒鐘,制動功率50%。在這種狀況下,通常主張?zhí)暨x比理論核算稍大一些的電阻,一起在參數P1237中相應地設置高一些的制動周期。
1、繞組接地毛病。在三相繞組中,有一處或多處絕緣損壞,使繞組中的鐵心、機座相碰,并使電流與機座相通,這么的毛病稱為繞組接地毛病。
2、毛病體現。繞組接地時,假如變頻調速電機外殼沒有接中性線或外殼的維護接地欠好,機座會帶電,用驗電筆測驗,能看到驗電筆發(fā)光。若用手背瞬間觸碰機座,則會被電擊而感到手臂麻目,還也許會使變頻調速電機在作業(yè)中發(fā)作反常響聲、振蕩和過熱等景象,嚴峻時使變頻調速電機不能起動。
3、繞組接地的影響。繞組發(fā)作接地毛病后,如變頻調速電機外殼維護接地不良機座會帶電。盡管變頻調速電機還能作業(yè),當人體觸碰機座,電流就會進過人體與大地構成回路,對人的生命有風險。當一相繞組中有一處接地時,該接地址就與機座構成回路,使相繞組的線圈匝數削減,因而使相電流添加,致使三相電流不平衡。當一相繞組中有兩處一起接地時,該繞組接地的兩處之間被鐵心、機座短路。短路的線圈匝數越多,相電流添加就越大。若兩相繞組有兩處一起接地,會引發(fā)相間短路,焚毀線圈,乃至使變頻調速電機不能起動作業(yè)。
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