Parameters With Optional Alignment; Initial Start-Up Of Multiple Inverter System; Multi-Inverter Settings; Assigning The Start-Up Order - DWT WaCS PWM Serie Instrucciones De Instalación Y Mantenimiento

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.
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
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