西門(mén)子 PS02-3001V5.00選擇合適的外部熔斷器,以避免因內(nèi)部短路對(duì)整流器件的損壞變頻器的型號(hào)確定后,若變頻器內(nèi)部整流電路前沒(méi)有保護(hù)硅器件的快速熔斷器,變頻器與電源之間應(yīng)配置符合要求的熔斷器和隔離開(kāi)關(guān),不能用空氣斷路器代替熔斷器和隔離開(kāi)關(guān)。
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2)選擇變頻器的引入和引出電纜根據(jù)變頻器的功率選擇導(dǎo)線截面合適的三芯或四芯屏蔽動(dòng)力電纜。尤其是從變頻器到電機(jī)之間的動(dòng)力電纜一定要選用屏蔽結(jié)構(gòu)的電纜,且要盡可能短,這樣可降低電磁輻射和容性漏電流。當(dāng)電纜長(zhǎng)度超過(guò)變頻器所允許的輸出電纜長(zhǎng)度時(shí),電纜的雜散電容將影響變頻器的正常工作,為此要配置輸出電抗器。對(duì)于控制電纜,尤其是I/0信號(hào)電纜也要用屏蔽結(jié)構(gòu)的。對(duì)于變頻器的外圍元件與變頻器之間的連接電纜其長(zhǎng)度不得超過(guò)10m。
3)在輸入側(cè)裝交流電抗器或EMC濾波器根據(jù)變頻器安裝場(chǎng)所的其它設(shè)備對(duì)電網(wǎng)品質(zhì)的要求,若變頻器工作時(shí)已影響到這些設(shè)備的正常運(yùn)行,可在變頻器輸入側(cè)裝交流電抗器或EMC濾波器,抑制由功率器件通斷引起的電磁干擾。若與變頻器連接的電網(wǎng)的變壓器中性點(diǎn)不接地,則不能選用EMC濾波器。當(dāng)變頻器用500V以上電壓驅(qū)動(dòng)電機(jī)時(shí),需在輸出側(cè)配置du/dt濾波器,以抑制逆變輸出電壓尖峰和電壓的變化,有利于保護(hù)電機(jī),同時(shí)也降低了容性漏電流和電機(jī)電纜的高頻輻射,以及電機(jī)的高頻損耗和軸承電流。使用du/dt濾波器時(shí)要注意濾波器上的電壓降將引起電機(jī)轉(zhuǎn)矩的稍微降低;變頻器與濾波器之間電纜長(zhǎng)度不得超過(guò)3m。
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