First, the frequent pre-charge, will lead to pre-charge resistance heat accumulation, and finally burned. So the provisions of a shortest cycle, is to resist the heat.

Second, the frequent pre-charge and discharge, DC bus capacitor life will be affected. Fold life. w25q80bvssig

Precharge and motor has nothing to do with the frequent start and stop, it is mainly for the inverter input power and said. Is the thyristor rectifier power supply, although you can not pre-charge resistance, but the second, the capacitor is also very worthy of concern. Frequent charge and discharge, will lead to the capacitor quickly finished.

By reason, the rectifier part of the current balance is based on the main circuit of the inverter current to calculate the pre-charge current is much smaller, should not cause too much impact. Even if the thyristor rectifier circuit, the number of starts can not be too much, the general number of normal thyristor circuit is not more than 6 times per hour, but this is not normal start, because this time the fan is not working, plus start Specific resistance to the inductive load is much greater than the current impact, heat accumulation is inevitable, but relative to the resistance to be worse. adum1200

Therefore, the rectifier part is also a factor in the impact.