195N2869 Invert summary：
When power is first applied to the frequency converter, it enters through the input terminals (L1, L2, and L3) and on to the disconnect and/or RFI filter option, depending on the unit's configuration.
Following the rectifier section, voltage passes to the intermediate section. This rectified voltage is smoothed by an sinewave filter circuit consisting of the DC bus inductor and the DC bus capacitor bank.
The DC bus inductor provides series impedance to changing current. This aids the filtering process while reducing harmonic distortion to the input AC current waveform normally inherent in rectifier circuits.
In the inverter section, once a run command and speed reference are present, the IGBTs begin switching to create the output waveform. This waveform, as generated by the Danfoss VVC+ PWM principle at the control card, provides optimal performance and minimal losses in the motor.
