西门子变频器制动电阻的计算方法 A、接着计算制动电阻的阻值在制动单元工作过程中，直流母线的电压的升降取决于常数RC，R即为制动电阻的阻值， B为变频器内部电解电容的容量。这里制动单元动作电压值一般为710V。 C、后计算制动电阻的标称功率由于制动电阻为短时工作制，因此根据电阻的特性和技术指标，我们知道电阻的标称功率将小于通电时的消耗功率， 一般可用下式求得： 制动电阻标称功率=制动电阻降额系数X制动期间平均消耗功率X制动使用率%2.6制动特点能耗制动（电阻制动）的优点是构造简单，缺点是运行效率降低，特别是在频繁制动时将要消耗大量的能量，且制动电阻的容量将增大。
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