描述
老型號的晶體管變頻器主要有以下缺點:容易跳閘、不容易再啟動、過負載能力低。由于IGBT及CPU的迅速發(fā)展,變頻器內(nèi)部增加了完善的自診斷及故障防范功能,大幅度提高了變頻器的可靠性。
如果使用矢量控制變頻器中的“全領(lǐng)域自動轉(zhuǎn)矩補償功能”,其中的“啟動轉(zhuǎn)矩不足”、“環(huán)境條件變化造成出力下降”等故障原因,將得到很好的克服。該功能是利用變頻器內(nèi)部的微型計算機的高速運算,計算出當(dāng)前時刻所需要的轉(zhuǎn)矩,迅速對輸出電壓進行修正和補償,以抵消因外部條件變化而造成的變頻器輸出轉(zhuǎn)矩變化。
此外,由于變頻器的軟件開發(fā)更加完善,可以預(yù)先在變頻器的內(nèi)部設(shè)置各種故障防止措施,并使故障化解后,仍能保持繼續(xù)運行,例如:對自由停車過程中的電機進行再啟動;對內(nèi)部故障自動復(fù)位并保持連續(xù)運行;負載轉(zhuǎn)矩過大時,能自動調(diào)整運行曲線,能夠?qū)C械系統(tǒng)的異常轉(zhuǎn)矩進行檢測。
造成變頻器故障的原因是多方面的,只有在實際中,不斷摸索總結(jié),才能及時消除各種各樣的故障。
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