;西門子規(guī)范傳動(dòng)產(chǎn)品供給的MM4系列制動(dòng)電阻均為5%制動(dòng)周期的電阻,所以在選型時(shí)應(yīng)加以留意;制動(dòng)周期在參數(shù)P1237中挑選;一起應(yīng)將P1240設(shè)置為0用以禁止直流電壓操控器。
制動(dòng)周期的核算有時(shí)候簡(jiǎn)單紊亂。實(shí)踐上,5%制動(dòng)周期就意味著制動(dòng)電阻能夠在12秒鐘內(nèi)耗費(fèi)100%的功率,然后需求冷卻228秒鐘。當(dāng)然假如制動(dòng)的時(shí)刻小于12秒鐘,或許耗費(fèi)的功率低于100%是別的一種狀況,變頻器會(huì)核算制動(dòng)電阻的i2t。假如制動(dòng)周期大于5%,440答應(yīng)設(shè)置較高的制動(dòng)周期,但實(shí)踐上很難精確地核算出制動(dòng)的狀況。比如說(shuō),一臺(tái)變頻器每分鐘制動(dòng)5秒鐘,制動(dòng)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(shù)P1237中相應(yīng)地設(shè)置高一些的制動(dòng)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(jī)座相碰,并使電流與機(jī)座相通,這么的毛病稱為繞組接地毛病。
2、毛病體現(xiàn)。繞組接地時(shí),假如變頻調(diào)速電機(jī)外殼沒有接中性線或外殼的維護(hù)接地欠好,機(jī)座會(huì)帶電,用驗(yàn)電筆測(cè)驗(yàn),能看到驗(yàn)電筆發(fā)光。若用手背瞬間觸碰機(jī)座,則會(huì)被電擊而感到手臂麻目,還也許會(huì)使變頻調(diào)速電機(jī)在作業(yè)中發(fā)作反常響聲、振蕩和過(guò)熱等景象,嚴(yán)峻時(shí)使變頻調(diào)速電機(jī)不能起動(dòng)。
3、繞組接地的影響。繞組發(fā)作接地毛病后,如變頻調(diào)速電機(jī)外殼維護(hù)接地不良機(jī)座會(huì)帶電。盡管變頻調(diào)速電機(jī)還能作業(yè),當(dāng)人體觸碰機(jī)座,電流就會(huì)進(jìn)過(guò)人體與大地構(gòu)成回路,對(duì)人的生命有風(fēng)險(xiǎn)。當(dāng)一相繞組中有一處接地時(shí),該接地址就與機(jī)座構(gòu)成回路,使相繞組的線圈匝數(shù)削減,因而使相電流添加,致使三相電流不平衡。當(dāng)一相繞組中有兩處一起接地時(shí),該繞組接地的兩處之間被鐵心、機(jī)座短路。短路的線圈匝數(shù)越多,相電流添加就越大。若兩相繞組有兩處一起接地,會(huì)引發(fā)相間短路,焚毀線圈,乃至使變頻調(diào)速電機(jī)不能起動(dòng)作業(yè)。
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