The controller controls the pump speed and thus the output of the pump. The input variables are given by various sensors, such as flow meters and level sensors. Then information triggers the pump controller, which then adjusts the speed of the pump to the optimal. A simple way of controlling pumps is the use of inverters, converters, or frequency inverters. The rotational speed is varied by controlling the amplitude, or by changing the frequency. By using the inverter, the control works very effectively and quickly, which is reflected in the good controllability of the pumping plants again.
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