制動周期的計算有時候簡略紊亂。實踐上，5%制動周期就意味著制動電阻可以在12秒鐘內消耗100%的功率，然后需求冷卻228秒鐘。當然假設制動的時間小于12秒鐘，或許消耗的功率低于100%是其他一種情況，變頻器會計算制動電阻的i2t。假設制動周期大于5％，440容許設置較高的制動周期，但實踐上很難精確地計算出制動的情況。比方說，一臺變頻器每分鐘制動5秒鐘，制動功率50%。在這種情況下，通常主張選擇比理論計算稍大一些的電阻，一同在參數(shù)P1237中相應地設置高一些的制動周期。
1、繞組接地缺點。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，這么的缺點稱為繞組接地缺點。
2、缺點表現(xiàn)。繞組接地時，假設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，用驗電筆檢驗，能看到驗電筆發(fā)光。若用手背剎那間觸碰機座，則會被電擊而感到手臂麻目，還或許會使變頻調速電機在工作中發(fā)作失常響聲、振動和過熱等景象，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)作接地缺點后，如變頻調速電機外殼維護接地不良機座會帶電。雖然變頻調速電機還能工作，當人體觸碰機座，電流就會進過人體與大地構成回路，對人的生命有危險。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(shù)減少，因而使相電流增加，致使三相電流不平衡。當一相繞組中有兩處一同接地時，該繞組接地的兩處之間被鐵心、機座短路。短路的線圈匝數(shù)越多，相電流增加就越大。若兩相繞組有兩處一同接地，會引起相間短路，焚毀線圈，甚至使變頻調速電機不能起動工作。
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