Centrifugal pump with frequency converter
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For centrifugal pumps equipped with variable frequency drives, is it good to use the drive to regulate the outlet pressure? Is it good to operate the frequency converter frequently? Why?
The main function of an inverter is to regulate flow rate for energy savings. There is nothing wrong with frequently changing the frequency of an inverter, as long as the frequency does not drop too low. Generally, inverters with higher power levels tend to overheat when the frequency is below 20 Hz.
The frequency converter is set up to facilitate flow regulation, so there should be no problem with it.
The outlet pressure of the pump should be determined by the downstream system; typically, the outlet of an inverter-driven pump is kept fully open, and no outlet valve is used to regulate flow – instead, the speed of the pump is adjusted via the inverter to change the flow rate