Current selection for frequency converters
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Regarding the selection of current ratings for frequency converters: the starting current of many devices reaches 5 times their rated current, whereas frequency converters can only handle 2–3 times their rated current. This often leads to overloading during startup. How should this be addressed?
Verify whether the actual load at the load side exceeds the rated current of the inverter. If the load current is within acceptable limits, it is recommended to check whether the parameter settings of the inverter are appropriate (verify this carefully). You may also run the inverter without any load for a test run.
First, check whether the load is starting under heavy load; if so, verify whether the inverter’s capacity was undersized； If the inverter capacity has been selected correctly, check whether the start-up time setting is too short—that is, whether the acceleration is too rapid ； Additionally, it’s necessary to check whether the inverter has a torque boost function. If this function is enabled, it should basically resolve the problem.