ENGLISH
19
5.3.
In most cases, the set does not need diaphragm expansion vessels. If it should be necessary to have a store of pressurised
water, it is possible to fit the vessel supplied with the set as follows:
1)
preload the vessel at a pressure 0.3 bar lower than the starting pressure of the pumps;
2)
fit the vessel onto the 1” couplings of the delivery manifold.
For sets with one pump, screw the T coupling, supplied with the set, into the delivery valve, then fit the tank onto the 1”
connector of the T coupling. If fitting the expansion vessel, set the Od parameter of the Active Driver at “2”.
For information on the Active Driver module, see the enclosed documentation.
5.4.
SET OPERATING LOGIC
The operating logic of the pump set you have bought is to supply
Constant Pressure as the water flow rate required by
the system varies
. This is made possible by the Active Driver module fitted on each pump.
It is advisable to set all the pumps at the same desired pressure value. At the first fall of pressure in the system, due to water
being drawn, the first pump starts. When the required flow rate rises, the second and/or the third pump starts in cascade.
The pumps stop in inverse order, after the decrease of the water flow rate.
At the second fall of pressure in the system, thanks to an alternating system in the starting of the pumps, the second pump
starts. When the required flow rate rises, the first and/or third pump starts in cascade. The pumps stop in inverse order, after
the decrease of the water flow rate.
For further information on the methods of alternation in the starting of the pumps, see the documentation enclosed with the
Active Driver module.
5.5.
CALIBRATION OF THE PRESSURE OF THE SET
a)
Switch on the pump 1 by means of the switch on the protection control unit (for sets with one pump it is sufficient to
insert the plug of the Active Driver module).
The display shows “
GO
” during operation and “
Sb
” when stopping.
b)
Press the
MODE / SET
keys simultaneously for a few seconds.
c)
The letters “
SP
” appear on the display, check whether the pressure value already set corresponds to the desired value;
otherwise change it, pressing the
+
or
–
keys
(range 1.0 / 9.0 bar).
d)
Press SET to return to normal operating status.
e)
Partly turn on the supply and check on the display or pressure gauge that the pressure remains constant when the water
supply increases or decreases (remaining within the limits of the pump’s performance).
f)
Repeat the procedure described in points a), b), c), d) e) for pump 2 and pump 3.
By pressing only the MODE key it is possible to view the following parameters:
Fr = pump operation frequency;
UP = instantaneous pressure (bar);
C1 = current absorbed by the pump (A).
For other operating parameters see the documentation enclosed with the Active Driver module.
5.6.
STOPPING OF THE PUMPS DUE TO AN ALARM
The pumps are stopped automatically in the following conditions:
1.
Lack of water at pump intake (dry running) for a time higher than 10 seconds (adjustable).
2.
Low supply voltage.
3.
Overheating of the internal components of the Active Driver.
4.
Excess current in the pump.
The pumps start again automatically when the conditions described above cease.
For further information see the documentation enclosed with the Active Driver module.
5.7.
If it should be necessary to stop the pumps when a certain pressure is exceeded, it is possible to install a pressure switch on
the delivery manifold, calibrated in such a way that it indicates when the pressure has been exceeded.
The contact of the pressure switch must be connected to the terminal board J22 of the Active Driver (inlet I3).
For further information see the documentation enclosed with the Active Driver module.
