DAB AD 2.2 AC Instrucciones De Instalación Y Mantenimiento página 97

PR Pressure sensor
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PW Password Settings
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4.3.1.2.1 Automatic alignment of sensitive parameters
When a multi inverter system is detected, the unit checks for consistency of the set parameters. If the sensitive parameters are not
aligned on all inverters, the display of each inverter shows a message requesting whether to transfer the configuration of the specific
inverter to the entire system. On acceptance, the sensitive parameters on the inverter where confirmation is given are distributed to all
other inverters in the series.
If there are configurations incompatible with the system, the configuration cannot be aligned from these inverters.
During normal operation, modification of a sensitive parameter on an inverter will cause automatic alignment of the parameter on all
other inverters without any request for confirmation.
Automatic alignment of sensitive parameters has no effect on all other types of parameter
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
 SO Min. dry-running factor threshold
 AE Anti-blocking
 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.
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