一、軟啟動器怎么測量好壞
1、第一步目測
通過目測可以觀察到軟啟動器是否有以下現象:軟啟動器強烈損(sun)(sun)壞(huai),損(sun)(sun)壞(huai)原因通常是碰撞(zhuang)、著火、進水、灰塵(chen)、負載短路等(deng)。
處理(li):可以(yi)寄回廠家(jia),根據損壞情(qing)況維修。
2、第二步嗅
無論(lun)軟(ruan)啟(qi)動器本體是(shi)否燒毀(hui),損壞通常是(shi)由于電(dian)流過(guo)(guo)大或(huo)負載過(guo)(guo)大造成(cheng)的。
處理:可以寄回廠家,根據損(sun)壞情況(kuang)維修。
3、第三步聽
如果軟(ruan)啟動(dong)器有任何異常(chang)聲(sheng)音,立即停止(zhi)。禁止(zhi)將功率因數補償(chang)電容器連(lian)接到(dao)啟動(dong)器輸出端。
二、軟啟動器使用需注意事項有哪些
1、軟啟動(dong)器的安裝和維護需由(you)合格的專(zhuan)業人員進行。
2、嚴(yan)禁使用高壓測試(shi)設備(如兆歐表)測試(shi)軟啟動器(qi)的(de)絕(jue)緣。
3、如(ru)果要(yao)求電動機(ji)可逆運行(xing),可以在進線側(ce)裝一個反轉接觸器(qi),注(zhu)意不(bu)要(yao)裝在軟起動器(qi)輸(shu)出側(ce)。
4、饒線型電動機轉(zhuan)子串入(ru)適當的起動(dong)(dong)(dong)機(ji)電阻以(yi)提高起動(dong)(dong)(dong)轉(zhuan)矩后(hou),軟起動(dong)(dong)(dong)器(qi)也可以(yi)用來起動(dong)(dong)(dong)饒線型電動(dong)(dong)(dong)機(ji),當電動(dong)(dong)(dong)機(ji)達到全速(su)并且穩(wen)定(ding)后(hou),起動(dong)(dong)(dong)電阻應該被旁路,減(jian)小功率(lv)損耗。
5、嚴禁將功(gong)率因(yin)數補償電容放在軟起(qi)動器的輸出側,且在起(qi)動期間不能(neng)切換電容。
6、軟(ruan)(ruan)起(qi)動器(qi)(qi)本身沒有(you)短(duan)路(lu)保護,為(wei)(wei)了保護其中的晶閘管,應該采用快速熔斷(duan)器(qi)(qi)。快速熔斷(duan)器(qi)(qi)應根(gen)據軟(ruan)(ruan)起(qi)動器(qi)(qi)的額(e)定(ding)電(dian)流來選擇。須指出,由于(yu)低壓斷(duan)路(lu)器(qi)(qi)開斷(duan)時間較長(chang)(約為(wei)(wei)0.1S)不宜用于(yu)晶閘管的保護。
7、當軟起(qi)(qi)動(dong)(dong)器使(shi)用(yong)(yong)電(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)制動(dong)(dong)停機(ji)(ji)時,只是由(you)于(yu)晶閘管(guan)不導通,使(shi)用(yong)(yong)電(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)的(de)輸入電(dian)(dian)(dian)(dian)壓為(wei)0V,但在(zai)電(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)與(yu)電(dian)(dian)(dian)(dian)源之間(jian)并沒有(you)形(xing)成電(dian)(dian)(dian)(dian)氣隔離,因此在(zai)檢修電(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)或線路時,必須(xu)切斷供電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)源。為(wei)此,應在(zai)軟起(qi)(qi)動(dong)(dong)器與(yu)電(dian)(dian)(dian)(dian)源之間(jian)增設斷器路。
8、當軟起(qi)(qi)(qi)動(dong)器功率(lv)較大或者臺(tai)數(shu)較多(duo)時(shi)(shi),產(chan)生的(de)高(gao)(gao)次諧波會對電(dian)網造(zao)成不良影響,并(bing)對電(dian)子(zi)設備(bei)產(chan)生干(gan)擾。為此,可在(zai)(zai)電(dian)動(dong)機(ji)在(zai)(zai)起(qi)(qi)(qi)動(dong)線(xian)路(lu)中裝設旁路(lu)接觸器,當電(dian)動(dong)機(ji)平穩起(qi)(qi)(qi)動(dong)至正常轉速(su)時(shi)(shi),旁路(lu)接觸器閉合,把軟起(qi)(qi)(qi)動(dong)器短接。即(ji)在(zai)(zai)起(qi)(qi)(qi)動(dong)完成之(zhi)后,大功率(lv)晶閘管不再工(gong)作,從而消除高(gao)(gao)次諧波對電(dian)網及電(dian)子(zi)設備(bei)的(de)干(gan)擾。
9、軟起(qi)動器內置有多種保(bao)(bao)護功(gong)能(neng)(如(ru)失速(su)及(ji)堵(du)轉測試、相(xiang)間平(ping)衡、欠載(zai)保(bao)(bao)護、欠電(dian)壓(ya)保(bao)(bao)護、過(guo)電(dian)壓(ya)保(bao)(bao)護等),具體應(ying)用時應(ying)根據實際需要(yao)通(tong)過(guo)編輯來(lai)選擇保(bao)(bao)護功(gong)能(neng)或使某(mou)些保(bao)(bao)護功(gong)能(neng)失效。比如(ru),在突然斷電(dian)比過(guo)負(fu)載(zai)造(zao)成(cheng)的損失更大(da)的場(chang)合,其(qi)過(guo)負(fu)載(zai)保(bao)(bao)護應(ying)作(zuo)用玞信(xin)號(hao)而不應(ying)作(zuo)用于切(qie)斷電(dian)路(lu)。
10、軟起動器的使(shi)用環境要求比較高,應做(zuo)好通風散熱工作,安裝(zhuang)時(shi)應在其上、下方(fang)留出一定(ding)空間,使(shi)空氣能流(liu)過其功率(lv)模塊。當軟起動(dong)器的額定(ding)電流(liu)較大時(shi),要采用風機降溫(wen)。