| 摘要 |
A method and arrangement for determining the flow rate ( Q ) produced by a pump, when the pump is controlled with a frequency converter, which produces estimates for rotational speed and torque of the pump, and the characteristic curves of the pump are known. The method comprising determining the shape of the Q H curve of the pump, dividing the QH curve into two or more regions depending on the shape of the Q H curve, determining on which region of the Q H curve the pump is operating, and determining the flow rate ( Q ) of the pump using the determined operating region of the characteristic curve. |
