| 摘要 |
<p>PROBLEM TO BE SOLVED: To avoid any water supply failure by continuing automatic operation without any trouble until the start of repair work as well as expediting quick repair when each sensor or a pressure tank is damaged. SOLUTION: Constitution is arranged in such a way that a motor-driven pump 4, a flow sensor 6 for outputting a specifics signal with a water quantity in use below a set value, a pressure sensor 9 for outputting a signal corresponding to the pressure on the pump delivery side and a pressure tank for restricting water pressure variation are provided, the pump is stopped after output of a particular signal of the flow sensor 6 and the pump is started when a pressure sensor output signal drops below its specific value so as to maintain the water supply pressure at the contact value. In this case, with regard to the pressure sensor 9, when its damage is determined, this trouble is announced to the outside and also after a pump stop lasting time after the damage determination passes a previously set time, the pump is started again, and with regard to the flow sensor 6, when its damage is judged, this event is announced to the outside and also the pump control is switched to a current control, and concerning the pressure tank, when its damage is judged, this trouble is announced to the outside.</p> |
