描述

在現(xiàn)在的維修中，我們有時(shí)排除以上這些原因可能還是解決不了問(wèn)題，OC故障仍然存在，當(dāng)然更換控制板也不是解決問(wèn)題的辦法，這時(shí)可以考慮一下驅(qū)動(dòng)電路是否存在問(wèn)題。三菱A500變頻器的檢測(cè)電路做的相當(dāng)強(qiáng)大，以上這些檢測(cè)點(diǎn)只要有任何一處有問(wèn)題都可能會(huì)報(bào)警，無(wú)法正常運(yùn)行。除了一般性驅(qū)動(dòng)電路所包括的驅(qū)動(dòng)電源，驅(qū)動(dòng)光耦隔離，驅(qū)動(dòng)信號(hào)放大電路，還包括輸出信號(hào)回饋電路等。在以前我們介紹的檢測(cè)手段無(wú)法解決問(wèn)題的情況下，要特別注意驅(qū)動(dòng)電路是否正常，檢測(cè)方向主要包括剛才介紹的三菱驅(qū)動(dòng)電路的幾個(gè)組成部分。
UVT故障。UVT為欠壓故障，相信很多客戶在使用中還是會(huì)碰到這樣的問(wèn)題，我們常見(jiàn)的欠壓檢測(cè)點(diǎn)都是直流母線側(cè)的電壓，經(jīng)大阻值電阻分壓后采樣一個(gè)低電壓值，與標(biāo)準(zhǔn)電壓值比較后輸出電壓正常信號(hào)，過(guò)壓信號(hào)或是欠壓信號(hào)。對(duì)于三菱A500系列變頻器電壓信號(hào)的采樣值則是從開(kāi)關(guān)電源側(cè)取得的，并經(jīng)過(guò)光電耦合器隔離，在我們的維修過(guò)程中，發(fā)現(xiàn)光耦的損壞在造成欠壓故障的原因中占有了很大的比重，這種現(xiàn)象在以前的變頻器維修中還是不多見(jiàn)的。

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