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)軟啟動器的主接線方法:
1、在線型:
所有軟啟動器的控制器都有電動機(jī)過載保護(hù),當(dāng)軟啟動器在線運(yùn)行時軟啟動器的控制器能對電機(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)常使用的場所,軟起動器的上口不加接觸器,圖4B是指不經(jīng)常使用的場所,在停車后將軟啟動器的電源斷開?! ?br />
2、旁路型:
旁路運(yùn)行軟啟動器,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。對于軟啟動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,不通過起動電流好,尤其是電子熱繼電器,由于經(jīng)過軟啟動器后電流諧波很大能干擾電子熱繼電器誤動作而使電機(jī)停車。另外因?yàn)榭煽毓璧亩虝r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。
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工作沒必要安裝快速熔斷器?! ‰妱訖C(jī)的過載保護(hù)是有軟啟動器的控制器實(shí)現(xiàn)的,它不僅在功能和性能上超過電子熱繼電器,而且不會因主回路的諧波電流及外界的干擾而誤動作。
電機(jī)軟啟動器的常見故障
目前國內(nèi)的軟起動器生產(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)超過國外品牌。本人多年來從事軟啟動的應(yīng)用和研究,在大量的實(shí)踐中得到了一些體會,在此與大家分享。
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