CX8093外接主電路如圖1所示。三相交流電源經(jīng)斷路器QF、交流接觸器KM與變頻器的電源輸入端R、S、T連接;變頻器的輸出端U、V、W則與電動機(jī)直接相連,這時電動機(jī)的保護(hù)由變頻器完成。這里的斷路器作用有:一是變頻器停用或維修時,可通過斷路器切斷與電源之間的連接;二是斷路器具有過電流和欠電壓等保護(hù)功能,可對變頻器起的保護(hù)作用。而接觸器可通過按鈕開關(guān)方便地控制變頻器的通電與斷電,同時,當(dāng)變頻器或相關(guān)控制電路發(fā)生故障時可自動切斷變頻器的電源。
CX8093輸出端與電動機(jī)之間是否需要配置交流接觸器,這要根據(jù)具體的應(yīng)用環(huán)境來確定。一般情況下,一臺變頻器控制一臺電動機(jī),且不要求與工頻進(jìn)行切換時,變頻器與電動機(jī)之間不要使用接觸器,如圖1所示。而一臺變頻器驅(qū)動多臺電動機(jī)時,則每臺電動機(jī)有單獨(dú)控制的接觸器,并選配合適的熱繼電器FR對電動機(jī)進(jìn)行保護(hù),具體電路如圖2所示。有時雖然一臺變頻器僅驅(qū)動一臺電動機(jī),但有可能在變頻與工頻之間切換運(yùn)行,這時也應(yīng)在變頻器與電動機(jī)之間配置接觸器KM3和熱繼電器FR。如圖3所示。接觸器KM3在電動機(jī)工頻運(yùn)行時用于切斷變頻器輸出端與電源之間的連接;熱繼電器FR可在工頻運(yùn)行時對電動機(jī)進(jìn)行保護(hù)。
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