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In the particular case of inserting an inverter with default settings in the series (in the case of an inverter which
replaces an existing model or an inverter with restored factory settings), if the configurations applied, with the
exception of factory settings, are consistent, the inverter with the factory settings will automatically take on the
sensitive parameters of the series.
4.3.1.3 Parameters with optional alignment
These are the parameters that are admissible even if not aligned with other inverters. Each time these parameters are
modified, when SET or MODE is pressed, the request is displayed whether to modify the entire communicating
inverter series. In this way if the series has all the same settings, the same data does not need to be set on all
inverters.
List of parameters with optional alignment:
LA
Language
RC
Rated current
MS
Measurement system
FS
Maximum frequency
UN
Pump rated voltage
SF
Starting frequency
ST
Starting time
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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