Regarding the issue of pump frequency conversion
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When a variable-frequency centrifugal pump is installed, why does the current drawn by the pump increase when the frequency of the pump is reduced? How to reach the most energy-efficient point?
I didn’t understand; please explain in more detail.
As the frequency of the pump is adjusted, the speed should decrease; thus, the pump does less work and the current also decreases, right? But the electrician said that after dropping to a turning point, the current would actually increase. I don’t understand
I have many variable-frequency motors here, and I’ve never heard of such a problem occurring with either high-power or low-power ones. However, I don’t have any centrifugal pumps here. It also depends on the settings of the variable frequency drive you use; I have centrifuges here, with Siemens variable frequency drives paired with Siemens motors, and they work normally – the lower the frequency, the lower the speed
It’s necessary to provide detailed information on the condition of the inverter in order to analyze it!