DCS卡件Foxboro FBM211 Differential 16 Input I/A Series PLC P0914TN FBM 211 Invensys
DCS卡件Foxboro FBM211 Differential 16 Input I/A Series PLC P0914TN FBM 211 Invensys
DCS卡件Foxboro FBM211 Differential 16 Input I/A Series PLC P0914TN FBM 211 Invensys
電機(jī)軟啟動(dòng)器的主接線方法：
1、在線型：
所有軟啟動(dòng)器的控制器都有電動(dòng)機(jī)過載保護(hù)，當(dāng)軟啟動(dòng)器在線運(yùn)行時(shí)軟啟動(dòng)器的控制器能對(duì)電機(jī)進(jìn)行過載保護(hù)，不要加裝熱過載繼電器。由于經(jīng)過可控硅后的電流諧波電流非常大，所以不能加裝電子式熱過載繼電器，否則熱繼的誤動(dòng)作使系統(tǒng)不能正常工作。由于可控硅比較昂貴而且更換困難，為了保護(hù)可控硅要用快速熔斷器防止軟啟動(dòng)器下口發(fā)生短路燒毀可控硅，圖4A是指在經(jīng)常使用的場(chǎng)所，軟起動(dòng)器的上口不加接觸器，圖4B是指不經(jīng)常使用的場(chǎng)所，在停車后將軟啟動(dòng)器的電源斷開?！ ?br />
2、旁路型：
旁路運(yùn)行軟啟動(dòng)器，離開旁路接觸器是無法運(yùn)行的，所以在兩種主接線方案里都有。對(duì)于軟啟動(dòng)器上口的接觸器的作用和在線運(yùn)行方式下作用相同在此不再重復(fù)。著重說明的是熱繼電器，把它安方在旁路接觸器的下口，不通過起動(dòng)電流好，尤其是電子熱繼電器，由于經(jīng)過軟啟動(dòng)器后電流諧波很大能干擾電子熱繼電器誤動(dòng)作而使電機(jī)停車。另外因?yàn)榭煽毓璧亩虝r(shí)工作沒必要安裝快速熔斷器，所以在主結(jié)線方案里沒有加裝快速熔斷器?！ ?br />
3、內(nèi)置旁路型：
它的主接線和在線型的大致相同，*的優(yōu)點(diǎn)是因?yàn)榭煽毓璧亩虝r(shí)工作沒必要安裝快速熔斷器?！ ‰妱?dòng)機(jī)的過載保護(hù)是有軟啟動(dòng)器的控制器實(shí)現(xiàn)的，它不僅在功能和性能上超過電子熱繼電器，而且不會(huì)因主回路的諧波電流及外界的干擾而誤動(dòng)作。
電機(jī)軟啟動(dòng)器的常見故障
目前國(guó)內(nèi)的軟起動(dòng)器生產(chǎn)廠家很多，大都是旁路型的，產(chǎn)品的可靠性與相比差距越來越小，*已經(jīng)超過國(guó)外品牌。本人多年來從事軟啟動(dòng)的應(yīng)用和研究，在大量的實(shí)踐中得到了一些體會(huì)，在此與大家分享。
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