Regarding the commissioning of rotor pumps
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I’ve been in this industry for only a short time, and I’d like to ask some questions of the more experienced colleagues here. There’s a rotor pump in the factory today with a speed of 256 RPM; its motor has a power rating of 15 KW, and its displacement is 1.950. A pressure gauge rated at 1.6 MP is installed on the outlet pipe. Now, I want to keep the pressure at 0.4 MP, as the outlet leads directly to the filling workshop. How can this be achieved, given that the pump is equipped with an ABB frequency converter? Could you explain in detail how to debug it?
Rotary pump belongs to the category of positive displacement pumps; therefore, the volume of liquid delivered with each rotation of the rotor is constant. If you want to control the outlet pressure without altering the process piping, you can try adjusting the frequency of the ABB inverter by reducing it
First of all, thank you for replying to my post. So do I need to manually adjust it to 0.4 MPa to find this point before setting the frequency? Then, how to maintain it at this level (either increase or decrease it), and what height should the liquid level in the suction tank be at? Our tank has a capacity of 30 cubic meters
First, you need to determine the inlet pressure, then calculate the pressure difference between the inlet and outlet at full pump speed (50HZ/60HZ). After that, use the formula ΔP/ƒ_full × ƒ_actual = P_actual to determine the pressure by adjusting the frequency
The frequency converter has a PID control function, which allows you to regulate the outlet pressure within a certain range, in a manner similar to how constant-pressure variable-frequency water pumps work. Of course, this is only possible for range control; it’s not possible to achieve such precise control at 0.4 Mpa, as there are too many factors that can influence the pressure. . . . The PID of this frequency converter can help you achieve a range such as 0.35Mpa to 0.4Mpa