METHOD AND DEVICE FOR CONTROL OF PUMP UNIT Russian patent published in 1997 - IPC

FIELD: pump engineering. SUBSTANCE: method comprises measuring the pressure in the delivery pipe line when the electric drive is disconnected, comparing this value with a reference minimum pressure corresponding to the bottom lever of water in a water tower, and turning on the electric drive of the pump unit at a pressure that does not exceed the reference minimum pressure. After a given laps of time equal to the duration of hydraulic transient processes in starting the value of pressure is stored and added to a given pressure drop between the top and bottom water levers in the water tower. The resulting value of pressure corresponding to the top lever of water in the tower is stored and current value of pressure, when the unit is in operation, is subtracted from this value. If the resulting value is negative the unit is turned off. EFFECT: enhanced reliability. 4 cl, 4 dwg