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電動機軟啟動控制柜故障處理1例

2019-09-26

軟啟動控制柜故障處理:

  一(yi)臺(tai)SSI)一(yi)320軟(ruan)啟(qi)動(dong)控制柜,采用一(yi)拖(tuo)二(er)接線方式分別控制2臺(tai)280 kW機(ji)組向凈水(shui)廠(chang)供水(shui),在一(yi)次開(kai)機(ji)操(cao)作過程中,操(cao)作人員按規程合上自動(dong)開(kai)關QF、QF3、QF4,然后按“啟(qi)動(dong)' 按鈕(niu),SSD-320面(mian)板狀態指(zhi)示"ON/EXIERNAL FAULT"亮,KM3動(dong)作閉合,電機(ji)不轉(zhuan)動(dong),復位后重試,故障依舊(jiu),無法(fa)開(kai)機(ji)。軟(ruan)啟(qi)動(dong)器電氣接線如圖(tu)1所示。  

分析這起故障時,首先應考慮判斷是軟啟動控制柜自身故(gu)(gu)(gu)(gu)障(zhang)還是外(wai)部(bu)故(gu)(gu)(gu)(gu)障(zhang)。用(yong)(yong)萬(wan)用(yong)(yong)電(dian)(dian)(dian)(dian)表(biao)5 v檔檢測出軟啟(qi)(qi)動(dong)器(qi)(qi)(qi)(qi)(qi)輸出端(duan)(duan)v.v.w無電(dian)(dian)(dian)(dian)壓,接(jie)觸(chu)(chu)器(qi)(qi)(qi)(qi)(qi)KM3能(neng)可(ke)靠(kao)閉(bi)合(he),屏柜(ju)指(zhi)(zhi)示燈2HY1亮,因此故(gu)(gu)(gu)(gu)障(zhang)很可(ke)能(neng)在(zai)軟啟(qi)(qi)動(dong)器(qi)(qi)(qi)(qi)(qi)本(ben)身。根據(ju)面(mian)板(ban)狀態指(zhi)(zhi)示“ ON x一(yi)TERNAL FAULT(外(wai)部(bu)故(gu)(gu)(gu)(gu)障(zhang))"亮,應(ying)從以(yi)下3個(ge)(ge)方(fang)面(mian)進(jin)行(xing)查找(zhao),即軟啟(qi)(qi)動(dong)器(qi)(qi)(qi)(qi)(qi)是否(fou)過(guo)熱(re)、外(wai)部(bu)故(gu)(gu)(gu)(gu)障(zhang)輸人(ren)(ren)OE是否(fou)開(kai)路(lu)、微處理器(qi)(qi)(qi)(qi)(qi)是否(fou)出現(xian)故(gu)(gu)(gu)(gu)障(zhang)3個(ge)(ge)方(fang)面(mian)。通過(guo)分析,我們認(ren)為電(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)剛(gang)開(kai)機(ji)(ji)不(bu)存在(zai)過(guo)熱(re)現(xian)象,應(ying)重(zhong)點(dian)(dian)檢查外(wai)部(bu)輸人(ren)(ren)OE ()H的9一(yi)11端(duan)(duan)點(dian)(dian))是否(fou)開(kai)路(lu)。該點(dian)(dian)是通過(guo)電(dian)(dian)(dian)(dian)流互(hu)感器(qi)(qi)(qi)(qi)(qi)對(dui)電(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)運行(xing)做(zuo)過(guo)負載(zai)保護(hu)的熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)常(chang)閉(bi)觸(chu)(chu)點(dian)(dian),用(yong)(yong)于過(guo)載(zai)時防(fang)止軟啟(qi)(qi)動(dong)器(qi)(qi)(qi)(qi)(qi)繼(ji)續工作,導致(zhi)(zhi)設備(bei)故(gu)(gu)(gu)(gu)障(zhang)而(er)采(cai)取的保護(hu)措施。由于電(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)尚(shang)未(wei)轉(zhuan)動(dong),熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)不(bu)應(ying)動(dong)作,用(yong)(yong)萬(wan)用(yong)(yong)表(biao)檢查,KH的9· 11端(duan)(duan)點(dian)(dian)之間電(dian)(dian)(dian)(dian)阻(zu)為零(正(zheng)常(chang)) ,人(ren)(ren)工復位后(hou)重(zhong)試(shi),故(gu)(gu)(gu)(gu)障(zhang)雖未(wei)解決,但在(zai)多次操作中,偶爾成(cheng)功一(yi)次,說(shuo)明某點(dian)(dian)有接(jie)觸(chu)(chu)不(bu)良現(xian)象。根據(ju)面(mian)板(ban)狀態指(zhi)(zhi)示℃N/EXTERNAL FAULT(外(wai)部(bu)故(gu)(gu)(gu)(gu)障(zhang))"的提示,將重(zhong)點(dian)(dian)放在(zai)OE輸人(ren)(ren)回路(lu),利用(yong)(yong)局(ju)部(bu)短(duan)路(lu)測量法(fa),并(bing)用(yong)(yong)導線將OE兩端(duan)(duan)短(duan)接(jie)后(hou)再試(shi),故(gu)(gu)(gu)(gu)障(zhang)排除(chu),更換(huan)新的熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)后(hou)正(zheng)常(chang)使用(yong)(yong)至今。這是一(yi)起(qi)較為特殊的電(dian)(dian)(dian)(dian)氣線路(lu)故(gu)(gu)(gu)(gu)障(zhang),對(dui)拆下的熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)該組(zu)觸(chu)(chu)點(dian)(dian)進(jin)行(xing)測量,電(dian)(dian)(dian)(dian)阻(zu)為零(正(zheng)常(chang))。這起(qi)故(gu)(gu)(gu)(gu)障(zhang)成(cheng)因是由于元(yuan)器(qi)(qi)(qi)(qi)(qi)件的制(zhi)造質量較差(cha),造成(cheng)控制(zhi)柜(ju)在(zai)啟(qi)(qi)動(dong)過(guo)程(cheng)中遭(zao)受交(jiao)流接(jie)觸(chu)(chu)器(qi)(qi)(qi)(qi)(qi)的強(qiang)大振動(dong)力,導致(zhi)(zhi)該熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)瞬(shun)間開(kai)斷,給軟啟(qi)(qi)動(dong)器(qi)(qi)(qi)(qi)(qi)微電(dian)(dian)(dian)(dian)腦(nao)一(yi)個(ge)(ge)指(zhi)(zhi)令信號,造成(cheng)軟啟(qi)(qi)動(dong)器(qi)(qi)(qi)(qi)(qi)故(gu)(gu)(gu)(gu)障(zhang)停機(ji)(ji)。

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