... power factor of more than 0.95 with the load of 20~100%, very low harmonic voltage/current ... off. The mature technology of cascade-connected power cells keeps the good output waveform, which protect the ... VFD to continue operating when one or two power cells are in failure. Auto re-start [OPTIONAL ... voltage, over current, low voltage, phase loss, over load, over heat, earth fault, and short circuit. The ...