Xylem HVS 1.1 - 3.4 - Manual (Page 3)

3
HYDROVAR sensorless
The idea is to control the pump speed
according to the power consumption of
the motor instead to the head of the
pump.
Each working point at a defined speed on
the curve of required pump head in the
hydraulic diagram (A,B,C) has also a
corresponding point in the electric
performance diagram (D,E,F).
Each of these points is defined by the
power consumption at the same speed.
All these points of power consumption at
different speeds results in a pretended
curve of power consumption at different
speeds.
If the controller varies the speed of the
pump at different flow values so that the
power consumption moves along this
curve and the working point of the pump
in the hydraulic diagram will also move
along the corresponding curve of pump
head but without measuring this head.
Energysavings