Reaching Of Maximum Inactivity Time; Reserves And Number Of Inverters Involved In Pumping; Power-Up And Start-Up; Initial Power-Up Operations - DAB AD x.x AC series Installations- Und Wartungsanleitungen

4.5.1.2

Reaching of maximum inactivity time

The multi inverter system has an anti-stagnant algorithm that is aimed at maintaining pump efficiency and
integrity of the pumped liquid. It acts by enabling rotation of the pump starting order to ensure a delivery to all
pumps of at least one minute of flow every 23 hours. This is implemented regardless of the inverter
configuration (enabled or reserve). Priority switch envisages that the inverter stationary for 23 hours is set to
maximum priority in the starting order. This means that it is the first to be started up as soon as flow delivery
is required. The inverters configured as reserve have priority over the others. The algorithm terminates action
when the inverter has delivered at least one minute of flow.
After the anti-stagnant interval, if the inverter is configured as reserve, it is set to minimum priority to avoid
premature wear.
4.5.2

Reserves and number of inverters involved in pumping

The multi inverter system reads how many elements are connected in communicating mode and calls this
number N.
Then, on the basis of parameters NA and NC it decides how many and which inverters must work at a given
time. NA represents the number of inverters involved in pumping NC represents the maximum number of
inverters that can run simultaneously.
In a series, if there are NA active inverters and NC simultaneous inverters, when NC is less than NA, this
means that a maximum of NC inverters will start up simultaneously, and these will switch between NA
elements. If an inverter is configured with reserve priority, it will set as last in the starting order, therefore for
example, if there are 3 inverters and one of these is configured as reserve, the reserve unit will start in third
place; otherwise if set to NA=2 the reserve will not start up unless one of the two active units sets to fault
status.
See also the explanation of parameters
NA: Inverter attivi par. 6.6.8.1;
NC: Inverter contemporanei par. 6.6.8.2;
IC: Configurazione della riserva 6.6.8.3.

5. POWER-UP AND START-UP

5.1 Initial power-up operations

On correct completion of installation of the hydraulic and electrical system (see chapter 2 INSTALLAZIONE)
and after reading the entire manual, the inverter can be powered up. Only in the case of initial power-up, after
the initial presentation, the display shows the error condition "EC" with the message informing the user to set
the parameters required for control of the electric pump; the inverter does not start up. To unlock the unit,
simply set the rated current value [A] of the electric pump used. Before start-up, if the system pump requires
special settings, other than the default versions (see par. 8.2) first make the modifications required and then
set the rated current value, to ensure start-up with the correct settings. The parameters can be set at any time,
but it is recommended to follow this procedure when the application is in operating conditions that may impair
integrity of the system components, such as in the case of pumps with a minimum frequency limit or do not
tolerate certain dry running times etc.
The following steps apply both in the case of systems with a single inverter and multi-inverter systems. In the
case of multi inverter systems, the relative connections of sensors and communication cables must be made,
after which one inverter at a time must be activated, performing the initial power-procedure for each. Once all
inverters are configured, all multi-inverter system elements can be powered up.
5.1.1

Rated current settings

From the page displaying the message EC, or more in general from the main menu, access the Installer menu
by pressing and holding the buttons "MODE" & "SET" & "- " simultaneously until "RC" appears on display. In
these conditions, buttons + and – enable respectively increase and decrease of the parameter value. Set the
current as specified in the manual or on the electric pump dataplate (for example 8.0 A).
ENGLISH
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