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To stabilize the pressure control operated by the CM module, it is suggested to put the
pressure sensor near the well exit, after the check valve.
Pressure sensor and power cables can be close but it is suggested to use a shield cable
connecting the shield to the sensor ground pin.
8.3 Minimum stop frequency at 0 delivery (f min Q=0) during constant pressure control.
Minimum stop frequency is the minimum frequency value that, while maintaining the p_set, water delivery is zero.
Below scheme graphically shows the function:
H
Progressively closing the water delivery valve reduces flow, causing CM to reduce the pump speed by reducing the
output frequency, to maintain a constant pressure (i.e. 3 bar).
Once the water flow stops (output completely closed), pump will run at minimum frequency to maintain the set
pressure.
Upon determining that the water requirement has stopped, CM stops the pump to save energy. Thus, the pump will
be stopped when minimum frequency is reached.
Once the pump is stopped at min. frequency value, set pressure is maintained in the system.
To maintain the pressure on the pump output line, it is necessary to install a small pressure tank able to compensate
for minor water leakage and to limit the number of pump restarts.
It is important to pinpoint that a particular set pressure corresponds to a single value of min. stop frequency.
If the end user wants to change the set pressure, a new value of min. stop frequency
should also be set.
12
100 Hz
80 Hz
76 Hz
40 Hz
p_set (es: 3 bar)
Q
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