| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump numbers control system capable of efficiently operating a group of pumps when operating the group of pumps composed of a plurality of pumps. SOLUTION: This pump numbers control system is provided with a pressure transmitting device 2 transmitting pressure of the group of pumps composed of an inverter pump and a plurality of constant speed pumps, a PID adjusting gage 4 for pressure, and a controller 6 which receives output of an inverter and a current pressure value of the group of pumps, computes a set pressure value of the PID adjusting gage 4, adjusts capacity always by controlling the number of revolutions of the inverter pump, and controls the numbers of operated constant speed pumps. The controller 6 controls the inverter pump to operate it always for adjusting capacity by comparing the current pressure value with the set pressure value of the PID adjusting gage 4 and controlling the number of revolutions of the inverter pump, starts the next constant speed pump when the pressure value exceeds a rotation stop pressure value and the number of revolutions is above the rotation start set number of revolutions, and stops the next constant speed pump when the pressure value is above rotation stop set pressure and the numbers of revolutions is below the rotation stop set number of revolutions. COPYRIGHT: (C)2005,JPO&NCIPI
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