6ES7 231-7PD22-0XA8 *熱電偶，模擬量

變頻器啟動加速時間設(shè)定太短；V/F特性電壓提升設(shè)定太大。

原因：變頻器啟動加速時間設(shè)定太短變頻器輸出頻率的變化遠遠超過電機轉(zhuǎn)速的變化（失速）；V/F電壓提升太大，變頻器輸出頻率已經(jīng)比較高了，而電機轉(zhuǎn)速還比較低（即電機轉(zhuǎn)速的變化滯后于變頻器頻率的變化），也會造成失速故障。這種“失速”就會導(dǎo)致變頻器過流故障。   對策：延長變頻器的加速時間設(shè)定；另外，低速電壓提升要也要在實際中反復(fù)實驗，不要設(shè)置太大，否則會導(dǎo)致變頻器一起動就發(fā)生過流故障。 

在變頻器的常見故障中，由其外圍電路引起的故障所占比例較大，在日常維護時，應(yīng)注意檢查電網(wǎng)電壓，改善變頻器、電機及線路的周邊環(huán)境，定期清除變頻器內(nèi)部灰塵，通過加強設(shè)備管理大限度地降低變頻器的故障率。

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