Variable frequency control for motorized equipment
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I would like to ask, what is the optimal range for the proper control of frequency conversion in variable-frequency pumps/fans? What is the impact of a low level on pumps/fans or motors? Thank you all!
The flow rate of a centrifugal pump is proportional to its rotational speed, while the head is proportional to the square of that speed. When the frequency is reduced, it is necessary to check whether the characteristic curve of the pump after frequency conversion intersects with the characteristic curve of the pipeline; if they do not intersect, the pump will be unable to transport liquid. For example, if the maximum head of the pump after frequency conversion drops from 100 meters to 50 meters, and the starting point of the pipeline’s characteristic curve is at 75 meters, then there will be no flow rate at all after frequency conversion
The frequency conversion level is too low; there may be a protection setting in place that causes the system to shut down – check how low it is
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