DCS卡件Foxboro P0914XL FBM212 Differential 14 Input, Thermocouple I/A Series
DCS卡件Foxboro P0914XL FBM212 Differential 14 Input, Thermocouple I/A Series
DCS卡件Foxboro P0914XL FBM212 Differential 14 Input, Thermocouple I/A Series
軟啟動器的故障大體分如下幾種:
1、電動機起不來:
電動機起不來的原因大致分兩種情況:
一是六只可控硅的其中一只觸發(fā)不可靠或是不導(dǎo)通,此時一相電路通過的是半波直流,電動機的兩相繞組通過的直流對電動機起到了制動作用,不僅電機起不來,嚴(yán)重的還會燒毀電機和可控硅。
二是啟動參數(shù)或啟動曲線不合適造成電機起不來,這是常見故障。前者在使用過程當(dāng)中會發(fā)生,但幾率低于接觸器的故障率。后者多發(fā)生在*次投運調(diào)試,調(diào)試好以后就不會出現(xiàn)。多數(shù)的廠家不會出現(xiàn)此現(xiàn)象,啟動程序性能好,出廠值設(shè)定的適用性強。只有很少廠家的產(chǎn)品需要廠家自己去調(diào)試?! ?/span>
2、可控硅燒毀:
可控硅擊穿或爆炸,此類故障不分國內(nèi)外品牌,因廠家而易,但都比接觸器的故障率低,而且主要問題出現(xiàn)在餅式可控硅的安裝工藝上?! ?/span>
3、控制器燒損:
相對于軟啟動器來講,控制器燒毀故障是zui嚴(yán)重的。有的廠家此類故障造成的返修率已超過30%。進口的或合資的廠家此類問題不多見。主要是控制器的電源和觸發(fā)電路以及輸入電路三部分容易燒毀?! ?/span>
4、軟啟動器誤動作:
電動機在運行的裝態(tài)下因軟起動器受干擾而停機在停止?fàn)顟B(tài)下因軟起動器受干擾而起動是時有發(fā)生,前者較普遍,后者只有兩個品牌發(fā)生過。究其原因,一是產(chǎn)品質(zhì)量問題,二是和線路布局有關(guān)。但是凡是進口或合資的軟啟都沒有上述現(xiàn)象,國產(chǎn)品牌中此問題比較多。
5、軟啟動器內(nèi)部插接件接觸不良:
軟啟動器內(nèi)部插接件選用本來不是問題,這是國內(nèi)廠家容易忽略的問題,經(jīng)常出現(xiàn)故障。進口或合資廠家都不犯此類的錯誤。
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