3.結(jié)束語
理論上的分析可以證實，該計劃思路是完全合理的。實踐中，變頻器選用直流制動并配適合當(dāng)?shù)闹绷髦苿訒r間，初步頻率和制動準(zhǔn)位所發(fā)作的電機剎車作用也比照明顯。
選擇精確的變頻器制動電阻是保證制動作用并避免設(shè)備損壞的必要條件：
首要要計算制動功率并制造精確的制動曲線；再根據(jù)制動曲線判定制動周期及制動功率；根據(jù)所判定的制動功率及制動周期，一同參看電壓、阻值等條件選擇適合的制動電阻；所選制動電阻阻值不能小于選型手冊中規(guī)矩的數(shù)值，否則將直接構(gòu)成變頻器損壞！這在電阻選型時應(yīng)予以說明。
有時候制動功率欠好判定，或為了保證安全，可選擇制動功率較大的電阻；西門子標(biāo)準(zhǔn)傳動產(chǎn)品供給的MM4系列制動電阻均為5％制動周期的電阻，所以在選型時應(yīng)加以留心；制動周期在參數(shù)P1237中選擇；一同應(yīng)將P1240設(shè)置為0用以禁止直流電壓控制器。
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