雙(shuang)金(jin)屬(shu)(shu)型保護(hu)器實際上是一(yi)種用雙(shuang)金(jin)屬(shu)(shu)片(pian)制(zhi)成的(de)(de)(de)開關或繼電(dian)器，由(you)于價(jia)格低廉(lian)而(er)得到廣泛應(ying)用。雙(shuang)金(jin)屬(shu)(shu)片(pian)由(you)兩層熱膨脹系(xi)(xi)數(shu)不(bu)同的(de)(de)(de)合(he)(he)金(jin)疊(die)合(he)(he)而(er)成，其中(zhong)，膨脹系(xi)(xi)數(shu)較(jiao)大的(de)(de)(de)稱為主動層；膨脹系(xi)(xi)數(shu)較(jiao)小的(de)(de)(de)稱為被動層。由(you)于兩層材料(liao)膨脹系(xi)(xi)數(shu)不(bu)同，雙(shuang)金(jin)屬(shu)(shu)片(pian)在(zai)溫(wen)度(du)升高時會(hui)彎(wan)曲變(bian)形，而(er)溫(wen)度(du)降低后(hou)又會(hui)恢復原來的(de)(de)(de)樣(yang)子。人們(men)利用這一(yi)現(xian)象，制(zhi)作(zuo)出能夠在(zai)溫(wen)度(du)下閉合(he)(he)或斷開的(de)(de)(de)開關。

對于壓縮(suo)(suo)機(ji)(ji)電(dian)機(ji)(ji)而言，當繞組溫(wen)度(du)(du)升高到(dao)一定溫(wen)度(du)(du)時(shi)（比如110℃），需要及時(shi)斷(duan)開(kai)電(dian)源，以防燒毀(hui)；而當溫(wen)度(du)(du)降低到(dao)某個溫(wen)度(du)(du)（比如60℃）后又可自動復位，壓縮(suo)(suo)機(ji)(ji)恢復運(yun)轉(zhuan)。這就是(shi)雙金屬(shu)片保護(hu)器的工作(zuo)原理。

在工(gong)作停(ting)機后(hou)，按(an)移位鍵3秒(miao)顯示循環故障記錄，3秒(miao)后(hou)自動復位，按(an)數據鍵查詢電動機工(gong)作時間、運轉時間統(tong)計。

12）摸(mo)擬量DC4-20mA 接(jie)口：20mA對應(ying)于保護(hu)監控器默(mo)認為(wei)規格電流值。

例(li)：過電流設(she)定值為30A時(shi)，所對應的電流值30A*2=60A。

13）運運狀(zhuang)態按數(shu)據鍵(jian)查(cha)看工(gong)作電(dian)壓，軟啟動器(qi)FT-ZR-600KW配置參數(shu)，3秒后自(zi)動復位(wei)：按復位(wei)鍵(jian)輪流(liu)查(cha)看A、B、C三相工(gong)作電(dian)流(liu)；3秒后回(hui)到A相電(dian)流(liu)；按功能鍵(jian)可(ke)查(cha)閱(yue)設置參數(shu)但(dan)不能修改參數(shu)。上(shang)(shang)位(wei)機對下(xia)位(wei)機監控時面板上(shang)(shang)的通(tong)訊(xun)指示燈亮(liang)。

14）故(gu)障狀態：面板上(shang)的(de)對應指(zhi)示燈被點(dian)亮，顯示器(qi)顯示故(gu)障動作值(zhi)記錄，按復位(wei)鍵保(bao)護器(qi)進入復位(wei)。

運行操作(zuo)與故障指(zhi)示(shi)：設置完(wan)畢或保護(hu)器再次接入(ru)工(gong)作(zuo)電(dian)(dian)源(yuan)后，無自啟(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)功(gong)(gong)能(neng)時，顯示(shi)整(zheng)定電(dian)(dian)流值A，按數(shu)據鍵(jian)顯示(shi)電(dian)(dian)壓U3秒種自動(dong)(dong)(dong)(dong)(dong)返回：有自啟(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)功(gong)(gong)能(neng)時顯示(shi)自啟(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)時間(jian)(jian)。自啟(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)時間(jian)(jian)過(guo)后進(jin)入(ru)電(dian)(dian)動(dong)(dong)(dong)(dong)(dong)機(ji)(ji)啟(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)狀(zhuang)態，電(dian)(dian)機(ji)(ji)啟(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)且顯示(shi)啟(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)時間(jian)(jian)。啟(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)時間(jian)(jian)過(guo)后進(jin)入(ru)運行狀(zhuang)態。

電(dian)(dian)(dian)(dian)動(dong)機(ji)保護器(qi)(qi)(qi)(qi)由(you)三(san)相電(dian)(dian)(dian)(dian)流互(hu)感器(qi)(qi)(qi)(qi)、檢(jian)測(ce)、放(fang)(fang)大、、調(diao)整電(dian)(dian)(dian)(dian)路和(he)執(zhi)行繼電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)組成(cheng)。檢(jian)測(ce)電(dian)(dian)(dian)(dian)路檢(jian)測(ce)到電(dian)(dian)(dian)(dian)流互(hu)感器(qi)(qi)(qi)(qi)感應的電(dian)(dian)(dian)(dian)流缺相或(huo)大于(yu)設定值(zhi)時(shi)，經(jing)放(fang)(fang)大器(qi)(qi)(qi)(qi)放(fang)(fang)大，使繼電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)動(dong)作(zuo)(zuo)。繼電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)觸(chu)頭串(chuan)接(jie)于(yu)接(jie)觸(chu)器(qi)(qi)(qi)(qi)線圈供電(dian)(dian)(dian)(dian)回路中(zhong)，繼電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)動(dong)作(zuo)(zuo)后使接(jie)觸(chu)器(qi)(qi)(qi)(qi)斷電(dian)(dian)(dian)(dian)，起到保護電(dian)(dian)(dian)(dian)機(ji)作(zuo)(zuo)用(yong)。電(dian)(dian)(dian)(dian)路用(yong)于(yu)避開電(dian)(dian)(dian)(dian)機(ji)起動(dong)電(dian)(dian)(dian)(dian)流，其時(shi)長可調(diao)。調(diao)整電(dian)(dian)(dian)(dian)路用(yong)于(yu)根據被保護電(dian)(dian)(dian)(dian)機(ji)工作(zuo)(zuo)電(dian)(dian)(dian)(dian)流設置動(dong)作(zuo)(zuo)電(dian)(dian)(dian)(dian)流。

過(guo)流和過(guo)壓。綜(zong)合保護器(qi)配合交(jiao)流接觸(chu)器(qi)使用，【在正常工作的線(xian)路(lu)(lu)中】保護器(qi)有四個接線(xian)柱，1，2是(shi)電源與接觸(chu)器(qi)線(xian)圈(quan)并聯，3，4是(shi)開關(guan)，串(chuan)聯在控制回路(lu)(lu)中即可。再用表(biao)測額定電流，調適保護器(qi)檢測電流，已達到預期的效果