電(dian)源(yuan)故障檢查：

故障狀態(tai)：上電(dian)后整機無反應，操縱(zong)顯示(shi)(shi)面板無顯示(shi)(shi)。丈量(liang)控(kong)制端子的(de)24V、10V控(kong)制電(dian)源都為O。 

故障實質(zhi)：變(bian)頻器的開關電源(yuan)沒(mei)有工作。

檢驗思路：1、開關電壓故障(zhang)；2、預充電回路故障(zhang)。

檢驗方法：

1、先(xian)(xian)查(cha)開關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的供電(dian)(dian)(dian)(dian)(dian)(dian)來源(yuan)(yuan)(yuan)，直流回(hui)路(lu)(lu)有無正(zheng)常530V電(dian)(dian)(dian)(dian)(dian)(dian)壓。直流回(hui)路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)(dian)壓為(wei)O，說明預(yu)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)回(hui)路(lu)(lu)故障(zhang)，充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)阻開路(lu)(lu)、半波整流電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)損(sun)壞、串進接觸(chu)器(qi)或繼電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)常閉(bi)點接觸(chu)不(bu)良，應將預(yu)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)回(hui)路(lu)(lu)先(xian)(xian)行修復，再檢查(cha)開關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的故障(zhang)。而往往修復預(yu)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)回(hui)路(lu)(lu)，變頻(pin)器(qi)也就修復了(le)。先(xian)(xian)不(bu)必在開關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)上大展拳腳；

2、開關電源(yuan)的(de)530V或300V直流供(gong)電都(dou)有(you)了，還是不要在(zai)其穩(wen)壓(ya)和(he)振蕩電路(lu)上下功夫(fu)，先檢(jian)(jian)測開關變壓(ya)器次級負(fu)載電路(lu)有(you)無(wu)(wu)短路(lu)等故障，如散熱風扇(shan)損壞，故障檢(jian)(jian)測電路(lu)中的(de)IC短路(lu)、整流二極管有(you)無(wu)(wu)擊(ji)穿等。開關電源(yuan)負(fu)載側的(de)故障率較高(gao)，振蕩和(he)穩(wen)壓(ya)環節的(de)題(ti)目倒(dao)少一些。

檢驗思(si)路和(he)檢驗次序，便決定了檢驗工(gong)作的(de)高(gao)效率和(he)低效率。而從整(zheng)機電路來看，開關電源不(bu)工(gong)作的(de)故障，檢查預充電電路則(ze)是一個非常重要的(de)環節，甚至是一位(wei)必須考慮到的環節。