KL3468對(duì)于輕載負(fù)荷電動(dòng)機(jī)與變頻器選擇：由于變頻器輸出的電壓、電流中有高次諧波，這樣電動(dòng)機(jī)的功率因數(shù)、效率會(huì)有程度上的下降，而工作電流會(huì)增加10％，因此在選擇變頻器容量可按照以下公式計(jì)算：

Ife≥1.1Ie或者是Ife≥1.1Imax；式中的Ife為變頻器的額定輸

1769-IT6

1769-L16ER-BB1B

1769-L18ER-BB1B

1769-L18ERM-BB1B

1769-L23-QBFC1B

1769-L23E-QB1B

1769-L23E-QBFC1B

1769-L24ER-QB1B

1769-L24ER-QBFC1B

1769-L27ERM-QBFC1B

1769-L30ER

1769-L30ER-NSE

1769-L30ERM

1769-L31

1769-L32C

1769-L32E

1769-L33ER

1769-L33ERM

1769-L35CR

1769-L35E

1769-L36ERM

出電流，（A）；Ie為電動(dòng)機(jī)額定電流，（A）；Imax為電動(dòng)機(jī)實(shí)際運(yùn)行中的大電流，（A）。

對(duì)于重載啟動(dòng)和頻繁啟動(dòng)、制動(dòng)時(shí)的變頻器與電動(dòng)機(jī)配套選擇，則按照Ife≥（1.2~1.3）Ie計(jì)算。

對(duì)于多臺(tái)電動(dòng)機(jī)共用一臺(tái)變頻器容量選擇的計(jì)算，除上面幾點(diǎn)外，還要按各電動(dòng)機(jī)的電流總值選擇。設(shè)所有電動(dòng)機(jī)的功率相等，如有部分電動(dòng)機(jī)直接時(shí)，可按下式進(jìn)行計(jì)算容量：Ife≥N2Iq+（N1-N2）Ie/kf；式中的N1 為電動(dòng)機(jī)總臺(tái)數(shù)；N2為直接啟動(dòng)電動(dòng)機(jī)臺(tái)數(shù)；Iq為電動(dòng)機(jī)直接啟動(dòng)電流，（A）；kf為變頻器允許過(guò)載倍數(shù)，一般為1.5倍計(jì)算；這樣相對(duì)比采用多臺(tái)小功率的變頻器要節(jié)約投資。

當(dāng)幾臺(tái)電動(dòng)機(jī)功率差別大，并且不能同時(shí)啟動(dòng)，工作時(shí)不易采用一臺(tái)變頻器來(lái)拖動(dòng)幾臺(tái)電動(dòng)機(jī)，否則選擇的變頻器功率會(huì)很大，在經(jīng)濟(jì)上不劃算。

KL3468

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