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西門(mén)子變頻器上電運(yùn)行后，不論是空載運(yùn)行還是帶負(fù)載運(yùn)行都會(huì)在西門(mén)子變頻器上顯示過(guò)流報(bào)警，當(dāng)此類故障發(fā)生時(shí)一般意味著西門(mén)子變頻器中的IGBT功率部件損壞，應(yīng)當(dāng)對(duì)西門(mén)子變頻器中的功率部件及驅(qū)動(dòng)部分進(jìn)行詳細(xì)的測(cè)量，檢測(cè)存在問(wèn)題的功率及驅(qū)動(dòng)部件，更換新的部件后再詳細(xì)的測(cè)量后才能再次上電，如驅(qū)動(dòng)部分存在問(wèn)題將會(huì)導(dǎo)致西門(mén)子變頻器中新更換的IGBT在上電后再次燒毀。造成此類故障的原因主要是由于西門(mén)子變頻器在使用的過(guò)程中出現(xiàn)多次過(guò)載或是西門(mén)子變頻器長(zhǎng)時(shí)間處于電壓波動(dòng)較大的情況，從而導(dǎo)致西門(mén)子變頻器中的器件燒毀，針對(duì)這一情況需要對(duì)西門(mén)子變頻器的外側(cè)電路進(jìn)行檢測(cè)，檢測(cè)電機(jī)是否正常，并在西門(mén)子變頻器的進(jìn)線端加裝電壓保護(hù)裝置，以避免西門(mén)子變頻器燒毀。

西門(mén)子品牌的模塊我們回收了10多年，給出的價(jià)格也是給我們的許多老客戶能認(rèn)可的，所以如果大家手上有閑置的產(chǎn)品可以直接聯(lián)系我們，我們不會(huì)給你低價(jià)的，我們是希望長(zhǎng)期合作的。

在輸出電路中往往需要注意對(duì)驅(qū)動(dòng)電路和負(fù)載器件的保護(hù)：

1）對(duì)于繼電器這類電感性負(fù)載，必須安裝火花抑制器。

2）對(duì)于容性負(fù)載，應(yīng)在信號(hào)輸出負(fù)載線路中串聯(lián)限流電阻。電阻阻值應(yīng)確保負(fù)載承受的瞬時(shí)電流和電壓被限制在額定值內(nèi)。

3）在用晶體管輸出直接驅(qū)動(dòng)指示燈時(shí)，沖擊電流可能損壞晶體管。為此應(yīng)設(shè)置保護(hù)電阻以防晶體管被擊穿。

4）當(dāng)被驅(qū)動(dòng)負(fù)載是電磁開(kāi)關(guān)、電磁離合器、電磁閥線圈等交流負(fù)載，或雖是直流負(fù)載，但工作電壓或工作電流超過(guò)輸出信號(hào)的工作范圍時(shí)，應(yīng)先用輸出信號(hào)驅(qū)動(dòng)小型中間繼電器（一般工作電壓＋24V），然后用它們的觸點(diǎn)接通強(qiáng)電線路的功率繼電器或直接去激勵(lì)這些負(fù)載（見(jiàn)圖1）。當(dāng)然，如果所用PLC裝置本身具有交流輸入、輸出信號(hào)接口，或有用于直流大負(fù)載驅(qū)動(dòng)的接口時(shí)，輸出信號(hào)就不必經(jīng)中間繼電器過(guò)渡，即可以直接驅(qū)動(dòng)負(fù)載器件。

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6ES7332-5HD01-0AB0*銷售