| 摘要 |
<p>PURPOSE:To make an operator easily comprehend the propriety of control on the number of pumps being in operation and the time transition of their operating state by determining increase or decrease in the number of the pumps to be operated by comparing characteristics depending on an actual lift and discharge quantity with prescribed highly effective characteristics curve data end referring to the present number of the pumps being in operation, and indicating guidance informations on the above-mentioned increase or decrease in changing the number of the pumps being in operation. CONSTITUTION:A monitoring means 8 for highly effective operation compares characteristics depending on an actual lift and discharge. quantity with previously prescribed highly effective characteristics curve data, and determines increase or decrease in the number of pumps to be operated on reference to the present number of variable speed distribution pumps P1-P4 being in operation, end indicates guidance informations showing the above-mentioned increase or decrease to a display means 7 in changing the number of the pumps being in operation. An operator can therefore easily comprehend the propriety of control on the number of the pumps being in operation and the time transition of their operating state on the basis of the indicated operating state of the variable speed distribution pumps P1-P4 and the guidance informations in changing the number of the pumps being in operation for keeping the highly effective operation of the pumps.</p> |
