SIEMENS PSCCM22AAN
SIEMENS PSCCM22AAN
SIEMENS PSCCM22AAN
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?,F(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。
在裝置內(nèi),有一臺(tái)75kW和一臺(tái)45kW摩擦式變速箱,能耗大,而且沒有滿負(fù)荷運(yùn)行,由于變頻技術(shù)的發(fā)展,采用可靠和相對(duì)便宜的變頻器來代替變速箱已成為可能,在變速箱出現(xiàn)故障,需要大修之際,對(duì)其進(jìn)行變頻改造。對(duì)裝置內(nèi)一臺(tái)75kW自清式氧化器的摩擦式變速箱采用變頻器替代,降低電動(dòng)機(jī)的運(yùn)轉(zhuǎn)頻率,減少了變速機(jī)的功率消耗,達(dá)到節(jié)能效果。
SIEMENS PSCCM22AAN
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