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變頻器功率的選用 系統(tǒng)效率等于變頻器效率與電動機效率的乘積,只有兩者都處在較高的效率下工作時,則系統(tǒng)效率才較高。從效率角度出發(fā),在選用變頻器功率時,要注意以下幾點: 1、變頻器功率值與電動機功率值相當(dāng)時合適,以利變頻器在高的效率值下運轉(zhuǎn)。 2、在變頻器的功率分級與電動機功率分級不相同時,則變頻器的功率要盡可能接近電動機的功率,但應(yīng)略大于電動機的功率。 3、當(dāng)電動機屬頻繁起動、制動工作或處于重載起動且較頻繁工作時,可選取大一級的變頻器,以利用變頻器長期、安全地運行。 4、經(jīng)測試,電動機實際功率確實有富余,可以考慮選用功率小于電動機功率的變頻器,但要注意瞬時峰值電流是否會造成過電流保護動作。 5、當(dāng)變頻器與電動機功率不相同時,則必須相應(yīng)調(diào)整節(jié)能程序的設(shè)置,以利達到較高的節(jié)能效果。 Golebo Blickschutzfolie rot für Olympus ? 7030 (mju 7030) De Alemania Ex-Pro® Black Model 677 Camera Case for Olympus Mju 7030, ?7030 De Reino Unido ADVENT 5711 INTERNAL TOUCHPAD BOARD - 920-000241-02 Rev A De Reino Unido Golebo Blickschutzfolie pink für Olympus ? 7030 (mju 7030) De Alemania MATROX P650 64MB AGP 8x DVI or VGA Dual Monitor Card De Reino Unido Golebo Blickschutzfolie blau für Olympus ? 7030 (mju 7030) De Alemania Philips PD7030 Tragbarer DVD Player 18 cm (7 Zoll) LC-Display, DivX B-Ware De Alemania Heki HO 7030 Major Construction Set Placas Accesorias 1-6 mm Nuevas con Caja* De Alemania Pantalla 17.3" N17306-L02 Rev. 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