FX5-485-BD

FX5-485-BD

使用變頻器容易忽視的問題：

(1)用搖表檢測(cè)電機(jī)的絕緣性能時(shí)，要斷開電機(jī)與變頻器的連接;

(2)變頻器的額定輸出電壓與額定輸入電壓是一致的，即當(dāng)輸入電源為單相AC220V(L、N端)或三相AC220V(R、S、T端)時(shí)，輸出為三相交流220V(U、V、W端)，用于驅(qū)動(dòng)額定電壓為AC380V的三相異步電機(jī)時(shí)，電機(jī)應(yīng)采用△形連接，保證電機(jī)每相繞組電壓是220V，這樣才能輸出較大的額定轉(zhuǎn)矩。如采用Y形連接，則定子每相繞組電壓只有127V，而轉(zhuǎn)矩與定子每相電壓的平方成正比，因此輸出轉(zhuǎn)矩將大大減小，可能無法驅(qū)動(dòng)電機(jī)所帶的機(jī)械負(fù)荷;

(3)普通三相異步電機(jī)的散熱風(fēng)扇與電機(jī)同軸轉(zhuǎn)動(dòng)，在低速運(yùn)行時(shí)散熱效果很差。在頻繁調(diào)速，頻繁起停、制動(dòng)的場(chǎng)合及頻率常處于30HZ以下或50Hz以上時(shí)，應(yīng)選用調(diào)頻電機(jī)，調(diào)頻電機(jī)有獨(dú)立的軸流散熱風(fēng)扇。

(4)高海拔地區(qū)，空氣稀薄，風(fēng)冷效果變差，變頻器要降額使用。

(5)連接電機(jī)的電纜，對(duì)變頻器來說，是容性負(fù)載。電纜越粗、越長(zhǎng)則電容量越大，容抗越小，漏電流越大，易引起變頻器過流保護(hù)動(dòng)作。因此要設(shè)法縮短電纜，電纜截面積夠用就行，不能隨意加粗。

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