《IC697BEM733》
《IC697BEM733》
空開跳閘,有時(shí)是某一臺(tái)變頻起動(dòng)就跳閘,有時(shí)是兩臺(tái)起動(dòng)跳閘。檢查所有接線、變頻參數(shù)設(shè)定及硬件都沒用問題,到廠家總空開處看發(fā)現(xiàn)他們的空開是臨時(shí)借用的,地線和中線短接且有漏電保護(hù)作用,只有30mA。而技術(shù)使用手冊(cè)上標(biāo)明每臺(tái)變頻都會(huì)有不大于30mA的漏電流。將對(duì)地漏電保護(hù)線拆除就好了。
過載時(shí)保護(hù),空載運(yùn)行就沒有問題,量三相也平衡。檢查了外部線路,操作臺(tái)都正常,變頻器三相也正常,電路板上的電流檢測(cè)電路也沒有什么問題,那故障出在那里了,想到霍爾傳感器,霍爾線,測(cè)量傳感器阻值是正常的,可能就是霍爾線不良了,取下來(lái)用萬(wàn)用表測(cè)量,發(fā)現(xiàn)還真是有一根信號(hào)線斷了,用電烙鐵焊好后運(yùn)行變頻器就正常了。此變頻器就安裝在電機(jī)旁邊,可能是振動(dòng)引起的吧!當(dāng)然變頻器安裝在電機(jī)旁邊本來(lái)就是不合理的,希望大家注意了。跟據(jù)這個(gè)現(xiàn)場(chǎng)經(jīng)驗(yàn),建議我們的用戶在安裝變頻器時(shí),對(duì)線路走線,安裝都要考慮是否符合安全規(guī)范,有條件套PV管或銅、鋁、鐵管,這樣即可保護(hù)好線路又可以屏蔽,如有條件建議安裝旁路,這樣就避免不少麻煩。
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