描述

三、故障解決

當(dāng)用鑷子短接STOP/RESET按鍵時(shí)，聽到變頻器內(nèi)傳來“吧嗒”一聲響，是充電繼電器吸合的聲音。這是什么情況？還真不太清楚啊。隨后發(fā)生的事更是蹊蹺，重新將STF和SD端子短接，呵呵，變頻器居然有輸出電壓了，而且三相輸出電壓的對(duì)稱度很好！帶著興奮地心情，趕緊斷電，把測(cè)試小電機(jī)接入變頻器輸出端子，再上電起動(dòng)變頻器，呵呵，電機(jī)運(yùn)轉(zhuǎn)的很輕快，很穩(wěn)定，用鉗形電流表側(cè)三相輸出電流也很對(duì)稱，變頻器運(yùn)行無輸出電壓的故障就這么解決了??！說實(shí)話，解決的有點(diǎn)突然，解決的有點(diǎn)意外，解決的有點(diǎn)不太明白！

四、結(jié)語

這次三菱FR-S520S-1.5K-CH故障維修經(jīng)歷有點(diǎn)特殊，特殊在故障發(fā)生的原因和解決的方法讓人有點(diǎn)發(fā)蒙，有點(diǎn)云霧繚繞的感覺，問題是解決了，但總覺著有點(diǎn)意猶未盡。

事后猜測(cè)式分析如下，估計(jì)有某種未知的故障因素導(dǎo)致主回路充電繼電器上電不動(dòng)作，變頻器雖然接受到運(yùn)行命令，但變頻器就是沒有輸出電壓。當(dāng)變頻器RESET復(fù)位按鍵有效時(shí)，無意間解除了未知故障因素，充電繼電器也就隨之吸合動(dòng)作，變頻器恢復(fù)正常。

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