Frequency inverter breakdown(1)

Overvoltage fault

The over-voltage of the inverter is concentrated on the DC voltage of the DC bus. Under normal circumstances, the inverter DC three-phase full-wave rectified average. If 380V line voltage calculation, the average DC voltage Ud = 1.35 U line = 513V. When an overvoltage occurs, the storage capacitor of the DC bus will be charged. When the voltage reaches about 760V, the inverter will overvoltage protection. Therefore, the frequency converter, has a normal operating voltage range, when the voltage exceeds this range is likely to damage the inverter.