西门子电源模块6SL3352-1AE33-8AA1

6SL3352-1AE33-8AA1

6SL3352-1AE33-8AA1

6SL3352-1AE33-8AA1

西门子公司不同类型的变频器，用户可以根据自己的实际工艺要求和运用场合选择不同类型的变频器。在选择变频器时因注意以下几点注意事顼： 1、根据负载特性选择变频器，如负载为恒转矩负载需选择西门子mmv/mdv、mm420/mm440变频器，如负载为风机、泵类负载应选择西门子430变频器。 2、选择变频器时应以实际电动机电流值作为变频器选择的依据，电动机的额定功率只能作为参考。另外，应充分考虑变频器的输出含有丰富的高次谐波，会使电动机的功率因数和效率变差。因此，用变频器给电动机供电与用工频电网供电相比较，电动机的电流会增加10%而温升会增加20%左右。所以在选择电动机和变频器时应考虑到这种情况，适当留有余量，以防止温升过高，影响电动机的使用寿命。 3、变频器若要长电缆运行时，此时应该采取措施抑制长电缆对地耦合电容的影响，避免变频器出力不够。所以变频器应放大一、两挡选择或在变频器的输出端安装输出电抗器。 4、当变频器用于控制并联的几台电动机时，一定要考虑变频器到电动机的电缆的长度总和在变频器的容许范围内。如果超过规定值，要放大两挡来选择变频器，另外在此种情况下，变频器的控制方式只能为v/f控制方式，并且变频器无法实现电动机的过流、过载保护，此时，需在每台电动机侧加熔断器来实现保护。 5、对于一些特殊的应用场合，如高环境温度、高开关频率、高海拔等，此时会引起变频器的降容，变频器需放大一挡选择。 6、使用变频器控制高速电动机时，由于高速电动机的电抗小，会产生较多的高次谐波。而这些高次谐波会使变频器的输出电流值增加。

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