140CPU31110
1、電機(jī)起不來(lái)
電機(jī)不能起動(dòng)的二種原因，一種是六種可控硅的其中一只觸發(fā)不可靠或是不導(dǎo)通，一相電路通過(guò)的是半波直流，電動(dòng)機(jī)的兩相繞組通過(guò)的直流對(duì)電動(dòng)機(jī)起到了制動(dòng)作用，不僅電機(jī)起不來(lái)，嚴(yán)重的還會(huì)燒毀電機(jī)和可控硅。二是啟動(dòng)參數(shù)或啟動(dòng)曲線不當(dāng)導(dǎo)致電機(jī)起不來(lái)，這是最為常見(jiàn)的故障問(wèn)題。
前者在使用中發(fā)生，但概率低于接觸器的故障率。后者多發(fā)生在第一次運(yùn)輸調(diào)整中，調(diào)整后不再出現(xiàn)。大多數(shù)軟啟動(dòng)器廠家的產(chǎn)品不會(huì)出現(xiàn)此問(wèn)題，啟動(dòng)程序性能好，出廠價(jià)值設(shè)定適用性強(qiáng)。只有很少制造商的產(chǎn)品需要制造商自己調(diào)整。
2、可控硅燒毀
可控硅破壞或爆炸，這種故障與國(guó)內(nèi)外品牌無(wú)關(guān)，但比接觸器故障率低，主要問(wèn)題出現(xiàn)在餅式可控硅的安裝技術(shù)上。
3、控制器燒損
與軟啟動(dòng)器相比，控制器燒損最嚴(yán)重。一些制造商出現(xiàn)這種故障，修理率超過(guò)30%。進(jìn)口和合資制造商此類(lèi)問(wèn)題很少見(jiàn)，主要是控制器的電源和觸發(fā)電路和輸入電路三個(gè)部分容易燒毀。
4、軟啟動(dòng)器誤動(dòng)作
電機(jī)在運(yùn)行裝置下軟啟動(dòng)器受到干擾停止?fàn)顟B(tài)下，軟啟動(dòng)器受到干擾啟動(dòng)時(shí)，前者普遍，后者只有兩個(gè)品牌。造成誤動(dòng)作的主要原因，一是產(chǎn)品質(zhì)量問(wèn)題，二是與線路布局有關(guān)。
5、軟啟動(dòng)器內(nèi)部插件接觸不良
軟啟動(dòng)器內(nèi)部插件的選擇本來(lái)不是問(wèn)題，這是國(guó)內(nèi)制造商容易忽視的問(wèn)題，故經(jīng)常發(fā)生故障。
140CPU31110
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140CPU31110
