ABB BAILEY IMDSO14、INSEM11
1、变频器的载波频率可以改变，但是我不推荐你随便去改这个参数。
2、为了减小噪声，可以将变频器的载波频率适当设置得高些，但这时又会带来一些问题，如果载波频率调得太高，又会对其它设备造成干扰，尤其是当采用PLC通讯方式时。因此要根据现场的实际情况设置载波频率。
3、如果不是非常有经验的工程师，建议不要改动载波频率这个参数。
4、MM440变频器的载波频率参数是P1800。
MM440变频器载波频率参数是P1800。
P1800——设定变频器功率开关的调制脉冲频率。这一脉冲频率每级可改变2kHz。
***低的脉冲频率取决于P1082（***大频率）和P0310（电动机的额定频率）。
电动机频率的***大值（P1082）限定为脉冲调制频率P1800。
当变频器散热器的温度（P0614）超过了报警电平，将使调制脉冲的开关频率降低和/或输出频率降低。
如果增加脉冲调制频率，变频器的***大电流（r0209）可能要降低（降容）。降容特性决定于变频器的型号和功率大小。如果变频器运行时并不要求***地安静，可选用较低的调制脉冲频率，这将有利于减少变频器的损耗和降低射频干扰发射的强度。在一定的环境条件下，可以减少变频器的开关频率，为变频器提供过温保护，保证设备不致因过温而损坏。
但是，按理论上来说载波频率是越高越好，因为这样逆变出来的波形越接近正弦波。
同时，调整变频器的载波频率可降低机器的噪音，但是，并不是说可以消除干扰，只是可以降低机器震动的噪音。
而且，降低载波频率会引起谐波的增加，所以说实际上干扰会更严重，对电机没有什么好处。
总的来说，降低载波频率会引起谐波分量增加，这是不好的现象，好处是有可能降低机器震动产生的噪音。建议不要乱动这个值！
5、6SE70变频器的载波频率参数是P340。
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