西門子直流調速裝置啟動電流大；直流(liu)(liu)調(diao)速器勵(li)磁(ci)(ci)控(kong)制(zhi)方式(shi)由電(dian)(dian)流(liu)(liu)控(kong)制(zhi)改為電(dian)(dian)壓(ya)(ya)控(kong)制(zhi)后，機器能(neng)正常使(shi)用，然后去沒有檢測(ce)(ce)出更嚴(yan)重的問(wen)題。我們來到(dao)現場(chang)后，實測(ce)(ce)勵(li)磁(ci)(ci)電(dian)(dian)流(liu)(liu)33安，額定(ding)19.9安，測(ce)(ce)到(dao)勵(li)磁(ci)(ci)電(dian)(dian)壓(ya)(ya)175V，將(jiang)勵(li)磁(ci)(ci)改為電(dian)(dian)流(liu)(liu)控(kong)制(zhi)后輸出電(dian)(dian)壓(ya)(ya)23V，果斷判斷為電(dian)(dian)機勵(li)磁(ci)(ci)線圈匝(za)間絕緣老(lao)化，需(xu)要大修。就在報價處理過(guo)程中(zhong)現場(chang)繼續強行(xing)開機工作，導致(zhi)BC相拉(la)弧，燒壞(huai)電(dian)(dian)源(yuan)板(ban)、主板(ban)。該設(she)備是(shi)將(jiang)圓形銅條擠壓(ya)(ya)成型生產出配(pei)送電(dian)(dian)使(shi)用的標準銅排(pai)，正常工作電(dian)(dian)流(liu)(liu)約500A。

維修過程：

    先將這臺先鋒Z4-280-42 型(xing)(xing)250KW直(zhi)流(liu)電(dian)動(dong)機(ji)拆除吊裝(zhuang)送維修廠，拆開勵(li)磁(ci)線圈后銅線已經燒黑變形(xing)，經過(guo)三天嚴格的繞制、成型(xing)(xing)、安裝(zhuang)、浸漆、烤(kao)干(gan)、測試、老化等(deng)工藝后，順(shun)利修復，并(bing)對直(zhi)流(liu)電(dian)動(dong)機(ji)做(zuo)軸承磨損測試、碳刷壓力調整(zheng)(zheng)、整(zheng)(zheng)流(liu)子車平刻槽(cao)、電(dian)樞絕緣檢測、內(nei)部除塵等(deng)全面(mian)保(bao)養。

  由于直流(liu)調(diao)速器(qi)被交流(liu)拉弧擊壞，維修起來可就沒那么(me)順利了(le)。先是(shi)維修開(kai)關(guan)電(dian)(dian)(dian)源(yuan)(yuan)，主(zhu)要(yao)元件無(wu)一幸免(mian)，通(tong)(tong)(tong)電(dian)(dian)(dian)試機(ji)后發(fa)(fa)現(xian)檢測比較器(qi)全部冒煙(yan)，更換后測量+24V,+15V,-15V,+5V均已修復，接主(zhu)板(ban)后顯示(shi)屏不(bu)(bu)亮，面(mian)板(ban)指示(shi)燈長亮，測量主(zhu)板(ban)電(dian)(dian)(dian)壓正(zheng)常，CPU嚴重發(fa)(fa)熱，只(zhi)好(hao)更換主(zhu)板(ban)。更換主(zhu)板(ban)后接通(tong)(tong)(tong)220V工作電(dian)(dian)(dian)源(yuan)(yuan)，顯示(shi)CALIBRATION FAIL校(xiao)準失敗，然后約半分鐘后觸(chu)發(fa)(fa)板(ban)100歐(ou)電(dian)(dian)(dian)阻冒煙(yan)，正(zheng)常情況下直流(liu)調(diao)速器(qi)這(zhe)個時(shi)候應該(gai)要(yao)顯示(shi)正(zheng)常，不(bu)(bu)發(fa)(fa)熱不(bu)(bu)報(bao)警的(de)， 清理線路后結果如下，主(zhu)板(ban)觸(chu)發(fa)(fa)芯片2003輸(shu)出導(dao)通(tong)(tong)(tong)信號(hao)，經(jing)過(guo)(guo)電(dian)(dian)(dian)源(yuan)(yuan)板(ban)的(de)十二顆標(biao)記053的(de)三極管(guan)（NPN,基極觸(chu)發(fa)(fa)后將集電(dian)(dian)(dian)極對地，集電(dian)(dian)(dian)極接的(de)是(shi)脈(mo)沖變(bian)壓器(qi)的(de)一個引(yin)(yin)(yin)(yin)腳，另一個引(yin)(yin)(yin)(yin)腳通(tong)(tong)(tong)過(guo)(guo)100歐(ou)電(dian)(dian)(dian)阻接通(tong)(tong)(tong)24伏），放(fang)(fang)大導(dao)通(tong)(tong)(tong)脈(mo)沖變(bian)壓器(qi)，跟(gen)功(gong)放(fang)(fang)輸(shu)出繼電(dian)(dian)(dian)器(qi)一個控(kong)制方式(shi)。可逆式(shi)電(dian)(dian)(dian)源(yuan)(yuan)板(ban)插座排列：兩(liang)端(duan)共8個引(yin)(yin)(yin)(yin)腳是(shi)+24V，中間兩(liang)排共12個引(yin)(yin)(yin)(yin)腳為(wei)觸(chu)發(fa)(fa)脈(mo)沖，不(bu)(bu)可逆小插座：右(you)側4個引(yin)(yin)(yin)(yin)腳為(wei)+24V，左側6個引(yin)(yin)(yin)(yin)腳為(wei)脈(mo)沖。發(fa)(fa)熱冒煙(yan)的(de)原因(yin)是(shi)其中一跟(gen)三極管(guan)短路，相(xiang)當開(kai)脈(mo)沖變(bian)壓器(qi)初級得到了(le)24V直流(liu)電(dian)(dian)(dian)壓，所(suo)以(yi)限流(liu)電(dian)(dian)(dian)阻會(hui)過(guo)(guo)熱冒煙(yan)。

西門子直流調速裝置啟動電流大；

故障(zhang)報警意思為(wei)電(dian)(dian)流(liu)傳感器(qi)異(yi)常，但(dan)是此時三(san)(san)個(ge)電(dian)(dian)流(liu)傳感器(qi)都已經接好(hao)，線路(lu)也沒有(you)開路(lu)，三(san)(san)個(ge)電(dian)(dian)流(liu)傳感器(qi)有(you)三(san)(san)個(ge)引(yin)腳(jiao)相(xiang)連，另外三(san)(san)個(ge)引(yin)腳(jiao)送到藍色主板插頭旁邊的六只(zhi)二極管(guan)形(xing)成三(san)(san)相(xiang)橋式(shi)整流(liu)，通過LM324比較檢測(ce)。更換(huan)LM324后ACCTS FAILED故障(zhang)消失。開關變(bian)壓器(qi)上邊三(san)(san)個(ge)指示燈：FLD HS OT ,ARM HS OT ,PHASE LOSS，分別是勵磁超溫，電(dian)(dian)樞超溫，三(san)(san)相(xiang)電(dian)(dian)平低報警。當兩(liang)個(ge)溫度(du)燈異(yi)常點亮時測(ce)試方(fang)法：溫度(du)線插頭外的兩(liang)顆圓(yuan)形(xing)貼(tie)片(pian)電(dian)(dian)阻(zu)100歐兩(liang)端(duan)分別對地，1001（1K）方(fang)形(xing)貼(tie)片(pian)電(dian)(dian)阻(zu)為(wei)檢測(ce)腳(jiao)，此時如果兩(liang)個(ge)溫度(du)燈還異(yi)常亮起(qi)，說明檢測(ce)電(dian)(dian)路(lu)壞了。