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變頻器運行期間能否開合變頻器與電動機之間的開關?
不可以,某些情況下這樣做會損壞變頻器或電動機。比如
? 假如你在變頻器運行期間打開開關,自感可引起過電流或過電壓。
? 假如你在變頻器運行期間閉合開關,根據電機的狀態可引起過電流。
由于以上原因,我們建議通常不要在變頻器運行期間使用開關。
在特殊情況下偶爾使用開關時應注意以下幾點安全事項:
根據VDE(德國電工聯合會)規定,"緊急停車"功能可能是破壞性的。只能按以下步驟將電動機與變頻器斷開,你的"緊急停車"操作才是安全的。
1) 激活“OFF2”。
2) 約100ms后再打開電機接觸器 。
(變頻器運行時打開接觸器會因自感損壞主回路)
3) 只要電機轉動就必須避免重新閉合接觸器(電機的剩余電壓也可導致主回路損壞)。 所以這時同樣要避免使用再起動回路。
4) 如需重新將變頻器切回,必須先取消"ON"和"OFF"命令然后再重新發出"ON"命令。(接通禁止)。
對于檢修開關,可在打開或閉合接觸器之前,使用一個繼電器接點給數字量輸入端送出一個"OFF2"命令=禁止變頻器輸出。(自由參數化)。
變頻器將在100ms內停止輸出。通常,應注意此時所有繼電器和接觸器都應加裝RC元件,否則會損壞變頻器。
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