Could an expert please explain the control principle of a feed pump driven by an inverter motor (for plate-and-frame sludge filter presses)?
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After the pump is started, once the pressure at the pump outlet reaches a certain level, the frequency drops to 22 Hz and the pump operates stably. Over time, the pressure at the pump outlet gradually increases; once it reaches a certain value, the pump stops operating automatically. How does an inverter control the frequency of the pump?
The frequency converter adjusts its output based on pressure
The frequency converter of the drive motor should be protected against operating at too low a frequency; there is a closed-loop control system that links the frequency to the pressure at the pump outlet. When the filter layer becomes dirty, the pressure rises, which leads to shutdown of the pump
The frequency converter is mainly used to adjust the pump speed, right? If a diaphragm pump is used as the feed pump, then frequency control is not necessary
The inverter has basic PLC functions