SCHNEIDER PC-0984-785
SCHNEIDER PC-0984-785
SCHNEIDER PC-0984-785
選用工作時(shí)產(chǎn)生諧波較小的交流變頻調(diào)速器及增加電感或電容濾波器。使用時(shí)發(fā)生交流變頻調(diào)速器找不到電機(jī)的故障,特別是停機(jī)時(shí)間較長問題更突出。分析原因?yàn)榻涣髯冾l調(diào)速器與電機(jī)之間連接電纜過長所致。安裝要求電纜不超過ZOOm,實(shí)際電纜長度超過30m。從而導(dǎo)致交流變頻調(diào)速器發(fā)出的信號(hào)衰減嚴(yán)重,交流變頻調(diào)速器接收不到反饋信號(hào),造成故障。將探測(cè)信號(hào)設(shè)置值加大,運(yùn)行近Za,該故障未再出現(xiàn),問題得到解決。
在現(xiàn)場(chǎng)直接停機(jī)或電網(wǎng)波動(dòng)造成停機(jī)時(shí),交流變頻調(diào)速器發(fā)生直流母線過電壓故障,無法再起動(dòng)。分析其原因?yàn)轱L(fēng)機(jī)屬于大轉(zhuǎn)動(dòng)慣量性質(zhì)的設(shè)備,停機(jī)時(shí)風(fēng)機(jī)中儲(chǔ)存的動(dòng)能通過電機(jī)轉(zhuǎn)換為電能回饋給交流變頻調(diào)速器,當(dāng)停機(jī)過快時(shí)將導(dǎo)致電機(jī)回能量過大,造成交流變頻調(diào)速器直流過電壓。將交流變頻調(diào)速器停機(jī)減加速設(shè)置時(shí)間由原來的3min改為4min,運(yùn)行至今該故障未再出現(xiàn),問題得到解決。
電網(wǎng)發(fā)生波動(dòng)時(shí),雖然電機(jī)可自起動(dòng),但造成工藝停車。其原因?yàn)榻涣髯冾l調(diào)速器停機(jī)信號(hào)是通過運(yùn)行信號(hào)繼電器(KA2)送至工藝連鎖停車,因此當(dāng)交流變頻調(diào)速器停止運(yùn)行時(shí),停車信號(hào)立即發(fā)出,導(dǎo)致工藝連鎖停車。現(xiàn)將停車信號(hào)由KAZ改為KTI輸出,KTI整定時(shí)間為45,這樣只要在45內(nèi)電機(jī)再起成功,就可以保證工藝不停車。修改后,在去年一年的幾次電網(wǎng)波動(dòng)中,未造成工藝停車,保證了連續(xù)生產(chǎn)降低。
SCHNEIDER PC-0984-785
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