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3.5 Enabling and disabling the motor
Once the first configuration has been performed with the wizard, the [RUN/STOP] key can be used to disable and re-
enable the motor control. If the inverter is running (green led ON yellow led ON) or is stopped (green led OFF yellow
led ON), the motor control can be disabled by pressing the [RUN/STOP] key.
When the inverter is disabled, the yellow led blinks and the green led is always off.
To re-enable pump control it is sufficient to press the [RUN/STOP] key again.
The [RUN/STOP] key can only disable the inverter, it is not a start command. The running status is decided only by
the regulating algorithms or by the inverter functions.
The key function is active on all the pages.
4 MULTI INVERTER SYSTEM
4.1 Introduction to multi inverter systems
A multi inverter system comprises a pump set made up of a series of pumps with delivery outlets all conveying to a
single manifold. Each pump of the set is connected to its own inverter and the various inverters communicate via a
special connection.
The maximum number of pump-inverter elements possible in a group is 8.
A multi inverter system is mainly used toper:
Increase the hydraulic performance with respect to a single inverter
Ensure operation continuity in the event of a fault on a pump or inverter
Partition maximum power
4.2 Setting up a multi inverter system
The pumps, motors and inverters in the system must be identical versions. The hydraulic system must be as
symmetric as possible in order to achieve a hydraulic load evenly distributed on all the pumps.
The pumps must all be connected to a single delivery manifold.
Since the pressure sensors are each inside the plastic body, you must take care not to place non-return
valves between one inverter and another, otherwise the inverters may read different pressures from each
other and give as a result a false mean value and an abnormal regulation.
For the operation of the booster set, the inverters must be of the same type and model; they must also be
the same for each inverter-pump pair:
type of pump and motor
hydraulic connections
rated frequency
minimum frequency
maximum frequency
4.2.1 Communication
The inverters communicate with each other through the dedicated 3-wire connection.
For the connection, see par. 2.3.6.
4.2.2 Remote sensor in multi-inverter systems
To use the pressure control functions with a remote sensor, the sensor can be only 1 connected to one of the inverters
present. Even several remote pressure sensors can be connected, up to one for each inverter. If several sensors are
present, the regulating pressure will be the mean of all the connected sensors.
To ensure that the remote pressure sensor can be visible by the other inverters, the multi-inverter communication
must be correctly connected and configured on all the inverters, and the inverter to which it is connected must be On.
4.2.3 Connection and setting of the optical coupling inputs
The inputs of the inverter are photocoupled (see para. 2.3.3 and 6.6.15) this means that galvanic separation of the
inputs from the inverter is guaranteed, to enable the functions for the float, auxiliary pressure, system disable, and low
pressure on intake. The functions are indicated respectively by the messages F1, Paux, F3, F4. If activated, the Paux
function boosts the pressure in the system to the set pressure, see par. 6.6.15.3. The functions F1, F3, F4 stop the
pump for 3 different reasons, see par. 6.6.15.2, 6.6.15.4, 6.6.15.5.
When using a multiple inverter system, the inputs must be used with the following settings:
the contacts that perform the auxiliary pressures must be connected in parallel on all the inverters so that the
same signal arrives on all the inverters.
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