| 摘要 |
PURPOSE: To facilitate setting when a pump is installed in a jobsite, and carry out stable estimate terminal pressure constant control operation even if inflow pressure is fluctuated. CONSTITUTION: A directly connecting type variable speed water feed device for carrying out estimate terminal pressure constant control operation, is provided with a differential pressure detecting means for calculating the differential pressure signalΔP of a discharge pressure signal Pd and an inflow pressure signal Ps, and a means for writing the differential pressureΔP corresponding to a rotational speed in a data table 103 by increasing rotational speed Hz of a pump at a prescribed interval. It is also provided with an automatically setting operation mode 104 for rewriting the data table 103 automatically on the dates of rotational speed of a pump which is rotated at a prescribed interval at the time of pump shut-off operation and the differential pressureΔP, when a feed water device is adjusted for installation at a jobsite.
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