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西門子變頻器上電運(yùn)行后，不論是空載運(yùn)行還是帶負(fù)載運(yùn)行都會在西門子變頻器上顯示過流報(bào)警，當(dāng)此類故障發(fā)生時(shí)一般意味著西門子變頻器中的IGBT功率部件損壞，應(yīng)當(dāng)對西門子變頻器中的功率部件及驅(qū)動部分進(jìn)行詳細(xì)的測量，檢測存在問題的功率及驅(qū)動部件，更換新的部件后再詳細(xì)的測量后才能再次上電，如驅(qū)動部分存在問題將會導(dǎo)致西門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子變頻器在使用的過程中出現(xiàn)多次過載或是西門子變頻器長時(shí)間處于電壓波動較大的情況，從而導(dǎo)致西門子變頻器中的器件燒毀，針對這一情況需要對西門子變頻器的外側(cè)電路進(jìn)行檢測，檢測電機(jī)是否正常，并在西門子變頻器的進(jìn)線端加裝電壓保護(hù)裝置，以避免西門子變頻器燒毀。

西門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，我們不會給你低價(jià)的，我們是希望長期合作的。

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

1）對于繼電器這類電感性負(fù)載，必須安裝火花抑制器。

2）對于容性負(fù)載，應(yīng)在信號輸出負(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)動負(fù)載是電磁開關(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輸出信號的工作范圍時(shí)，應(yīng)先用輸出信號驅(qū)動小型中間繼電器（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（見圖1）。當(dāng)然，如果所用PLC裝置本身具有交流輸入、輸出信號接口，或有用于直流大負(fù)載驅(qū)動的接口時(shí)，輸出信號就不必經(jīng)中間繼電器過渡，即可以直接驅(qū)動負(fù)載器件。

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