Inverter trips due to excessive current
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Our facility has a centrifugal pump used for pumping syrup; it is equipped with an 11KW, 4-pole motor. A Siemens 15KW frequency converter is used to regulate the liquid level by changing the frequency. However, once the frequency exceeds 35Hz, the pump shuts down due to excessive flow, even though the frequency converter itself isn’t damaged. I hope experts out there can help analyze this issue!
It’s likely that the optimization isn’t done properly; check if there are any issues with the settings for the rated current and overload current
I also think it might be that the parameters of the frequency converter aren’t set correctly!
Logically, using a 15KW inverter to drive an 11KW motor means there’s already a one-step increase in power, so it should be fine. Let’s take a look at the parameters first
Operate it directly at the power frequency, and check whether the motor current is within the rated range. Ideally, using a 15KW inverter to drive an 11KW motor means there is already a certain level of amplification, so there should be no problems.
First, check the parameter settings of the inverter, focusing on the rated values indicated on the motor’s nameplate; it is likely that there are no issues, and the parameters should be set before starting the machine. The issue with your question is likely related to the load; you can adjust the inverter to display the current value, and check whether the current indeed exceeds the rated value.
Based on the acceleration time and the rated current of the motor, as well as the setting value for the protection current specified in the new parameters, since it is difficult to transport viscous materials, rotor pumps are generally used, while centrifugal pumps usually operate in an overflow mode.