Reaching Of Maximum Inactivity Time; Reserves And Number Of Inverters Involved In Pumping; Power-Up And Start-Up; Initial Power-Up Operations - DAB PWM II 230 D 4.7 Instructions Pour L'installation Et La Maintenance

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: Active inverters par. 6.6.8.1;
NC: Simultaneous inverters par. 6.6.8.2;
IC: Reserve configuration par. 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.
When switching on for the first time and then when restarting after resetting the factory values, a wizard is proposed to
help you set the most important parameters. It will not be possible to start the pump until the wizard procedure is
finished.
Pay attention to any limits of the electropump such as minimum frequency limit or maximum dry running
time, and make any necessary settings.
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.
Incorrect configuration of the electric motor with star or delta connection may cause damage to
the motor.

5.2 Wizard

The wizard offers an assisted procedure for setting the main parameters necessary at the first start of the inverter.
Table 16 sums up the sequence of parameters to be set for each type of inverter.
ENGLISH
Type M/M Type M/M
sizes 11A and size 8.5A
14A
LA
MS
SP
FN
UN
RC

Table 16: Wizard

Wizard
Type M/T and
T/T
all sizes
LA LA
MS MS
SP SP
FN FN
RC RC
RT
72