@ Hydtools:... i am changing the control set point, system will remains same.
@ Flash3780:.... I agree with your second paragraph thats correct. and VFD also controlling the speed of pump, it maintain the speed according to demand flow.
thanks for software.
lets keep away the VFD for a moment, and considering simple star delta connection as i know if the water has to be pumped at more than the designed head, definitely the flow will be less because pump has to apply more efforts. m i rite? but since the VFD has been introduced, save the energy...
I simply calculated the flow vs head from friction loss chart given by pipe manufacturer at longest point not branches, it shows 6.5 bar, but the flow meter showing the same as design flow rate at the discharge of pump line. the problem is that since the system is partially in operation so i am...
ya its variable frequency drive which connected with PLC, i have made a max pressure set point 5 bar instead of designed 7.5 bar, i think to cover up the flow, velocity may increase and that will be dangerous for pipes, as pressure is inversely proportion to velocity and flow is directly...
Hi guys, can nay one help me , that I have pumping station for large irrigation system controlled by VFD with 7.5 bar designed pressure, but i am going to reduced the pressure at 5 bar from 7.5, due to some problems, will any impact on flow and velocity and will i get the same flow as on 7.5 bar
