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shjanny
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樓主  發(fā)表于: 2012-02-27 20:06
原先使用S540E變頻器，可以運轉在0-50hz之間。更換為D740后，同樣的運行模式（外部啟動(dòng)，電位器電壓調節式控制頻率），電位器轉到底，頻率也只能達到30不到。改為面板設置頻率可以運轉在50hz。請問(wèn)各位前輩這種情況是什么問(wèn)題？怎么解決？謝謝

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