Initial Start-Up Of Multiple Inverter System; Multi-Inverter Settings; Assigning The Start-Up Order; Maximum Operating Time - DAB ACTIVE DRIVER PLUS M/T 1.0 Instructions D'utilisation

List of parameters with optional alignment:
 LA
Language
 RC
Rated current
 MS
Measurement system
 FL
Minimum frequency
 FS
Maximum frequency
 UN
Pump rated voltage
 SF
Starting frequency
 ST
Starting time
 AC
Acceleration
 AE
Anti-blocking
 AF
Anti freeze
 O1
Output 1 function
 O2
Output 2 function

4.4 Initial start-up of multiple inverter system

Make electrical and hydraulic connections of the entire system as described in para 2.2 and para 4.2.
Switch on one inverter at a time and configure the parameters as described in chapter 5 taking care that when turning
on one inverter, all others are switched off.
After configuring all inverters individually, all can be switched on simultaneously.

4.5 Multi-inverter settings

When a multi inverter system is switched on, the addresses are assigned automatically and, by means of an
algorithm, an inverter is nominated as the settings leader. The leader decides on the frequency and order of start-up
of each inverter in the series.
The settings mode is sequential (inverters start one at a time). When start-up conditions are enabled, the first inverter
starts, and when this reaches maximum frequency, the next one starts, and so on. The order of start-up is not
necessarily ascending according to the machine address, but depends on the hours of operation; see ET: Tempo di
scambio par. 6.6.9.
When the minimum frequency FL is used, and there is only one inverter operative pressure surges may occur.
Depending on the case, pressure surges may be inevitable and may occur at the minimum frequency when this value,
in relation to the hydraulic load, causes a pressure level greater than the required value. On multi inverter systems,
this problem remains limited to the first pump that is started up, as on the subsequent pumps the situation is as
follows: when the previous pump reaches the maximum frequency, the next one starts up at the minimum frequency
to then reach the maximum frequency. When the frequency of the pump at maximum is reduced (obviously through to
the minimum frequency limit) the pump activation overlaps, which while observing minimum frequency rates, does not
cause pressure surges.

4.5.1 Assigning the start-up order

Each time the system is activated, each inverter is associated a starting order. This setting establishes the order of
inverter start-up.
The starting order is modified during use according to requirements, by the two following algorithms:

Reaching of maximum operating time

Reaching of maximum inactivity time

4.5.1.1 Maximum operating time

According to parameter ET (maximum operating time), each inverter has an hour counter, and the starting order is
updated on the basis of these values according to the following algorithm:
- if at least half of the value ET is exceeded, priority is changed on the first shutdown of the inverter (switch to
standby).
- if the value ET is reached without stopping, the inverter stops unconditionally and this sets to the minimum
restart priority (switch during operation).
If parameter ET (maximum working time) is set to 0, exchange occurs on each restart.
See ET: Tempo di scambio par. 6.6.9.
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