描述
所謂一次電路,是電動機(jī)繞組工作電流經(jīng)過的電路元件和導(dǎo)線:二次電路是保證設(shè)備正常運(yùn)行不可缺少的輔助電路.二次電路的主要功能有控制、測量、信號和保護(hù)等。使電動機(jī)啟動運(yùn)行和停止運(yùn)行的電路是二次電路的控制功能電路;電壓、電流、功率及功率因數(shù)等電參數(shù)的測量顯示是其測量功能;運(yùn)行和停止指示燈、異常報警聲響等是二次信號回路的電路元件:熱繼電器、電動機(jī)保護(hù)器等元件可以實(shí)現(xiàn)電動機(jī)保護(hù)功能。下面具體分析電動機(jī)直接啟動電路的工作過程。
三相電源的火線(相線)Ll、L2和L3接在隔離刀開關(guān)QS上端。QS的作用是在檢修時斷開電源.使受檢修電路與電源之間有一個明顯的斷開點(diǎn),保證檢修人員的安全。FU是一次回路的保護(hù)用熔斷器。準(zhǔn)備啟動電動機(jī)時,首先合上刀開關(guān)QS,之后如果交流接觸器KM主觸點(diǎn)閉合,則電動機(jī)得電運(yùn)行:接觸器主觸點(diǎn)斷開,電動機(jī)停止運(yùn)行。接觸器觸點(diǎn)閉合與否.則受二次電路控制。
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
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⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
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