Power reduction due to the rotating field frequency

The specified nominal output current I_N of the inverter is the effective value. The increased load on the power semiconductors has to be considered especially for slow rotating fields and rotating fields at standstill. In case of a rotating field at standstill, direct current that can correspond to the peak value of the sine current depending on the phase position is flowing.

This consideration is particularly important for output frequencies f_A < 3 Hz (e.g. for small speeds or standstill).