Xylem HVS 1.1 - 3.4 - Manual (Page 21)

21
5 Learning a System Curve to adapt the system’s requirements
CAUTION! Before you start the system, the pump has to be filled and all wiring and
piping has to be done!
The learning of the system’s required curve depends on the saved system points. It is
necessary to start at flow=0 and to save at least four system points up to a maximum
of 12 points.
Learning:
Before you start to learn, it is important that the motor was running with constant speed
to reach the operation temperature. Then you can choose between learning the first point
and select one of the pre programmed reference curves (only by using the external
programming unit) or learn 3 up to 12 points to run along the optimum system curve.
a) Using one of the pre programmed reference curves 2...7
1.) connect the external programming device to select your favourite reference curve
2.) Stop the pump while pressing the button ▼ on the HYDROVAR SENSORLESS.
3.) Press the ▲ and ▼ buttons together for 5 sec, the colour of the LED
changes from green to orange. The pump is now ready to learn.
4.) Set now the first system point at flow=0. You can change the speed of the pump
by using the button ▲ (higher frequency) or ▼ (lower frequency).
Check the difference pressure on an important point of the system to set the
required frequency.
On the display of the programming device, you can see the power and the
frequency.
5.) To save the learned point press the ▲ and ▼ buttons together, until the
LED will begin to start fast flashing. The Hydrovar sensorless stops automatically.
This saved point is now the min. point of your selected reference curve, but it can be used
for all other reference curves also.