DAB AD 2.2 AC Instruction For Installation And Maintenance page 100

5.1.4 Setting the setpoint pressure
From the main menu, press and hold MODE and SET simultaneously until "SP" appears on display. In these conditions, buttons
"+" and "–" enable respectively increase and decrease of the required pressure value.
The regulation range depends on the sensor used.
Press SET to return to the main page.
5.1.5 System with flow sensor
From the installer menu (the same used to set RC, RT and FN) scroll through the parameters using MODE to reach FI.
To work with the flow sensor set FI to 1. Use MODE to scroll through to the next parameter FD (pipeline diameter) and set the
diameter in inches of the pipe mounting the flow sensor.
Press SET to return to the main page.
5.1.6 System without flow sensor
From the installer menu (the same used to set RC RT and FN) scroll through the parameters using MODE to display FI. To work
without the flow sensor, set FI to 0 (default value).
Without the flow sensor, there are two flow reading modes, both settable on parameter FZ in the installer menu.
Automatic (self-learning): the system automatically identifies the flow and automatically adjusts settings accordingly. To
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set this operating mode, set FZ to 0.
Minimum frequency mode: in this mode the shutdown frequency is set at zero flow. To use this mode, move to parameter
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FZ, close delivery gradually (to avoid generating overpressure) and read the frequency value at which the inverter is
stabilised. Set FZ at this value + 2.
Example: if the inverter stabilises at 35Hz, set FZ at 37.
An excessively low value of FZ can cause irreparable damage to the pumps, because in this case the inverter would
never stop the pumps.
An excessively high value of FZ can cause pump shutdown even when there is flow present.
Modifications to the pressure set point thus also requires adjustment of the FZ value.
On multiple inverter systems without the flow sensor, the only admissible method of setting the FZ value is in minimum
frequency mode.
The auxiliary set points are disabled if the flow sensor is not used (FI=0) and when FZ is used in minimum frequency
mode (FZ ≠ 0).
5.1.7 Setting other parameters
After the initial start-up procedure, the other pre-set parameters can be modified as required, by accessing the relative menus
and following the instructions for the specific parameters (see chapter 6). The most common parameters are: restart pressure,
regulation gain values GI and GP, minimum frequency FL, water failure time TB, etc.
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