Italtecnica Sirio Manuel D'instructions page 15

OPERATION: at the time of power-on the first device that gets the control over the other becomes the MASTER while the other
functions as the SLAVE. When user services are opened the MASTER device starts the pump and when the maximum rotation speed is
reached and the system pressure is lower than the preset Pmin value, it transfers control to the second inverter, which becomes the new
MASTER, while the first inverter becomes the SLAVE and its rotation speed remains fixed. With the progressive closing of the user
services the second device stops the pump and control is again transferred to the first inverter, which will stop the electric pump when
the water demand is reduced to zero after complete closing of each user. After the electric pump has been stopped MASTER status is
again transferred to the other device to ensure constant changeover of the pump that is started first. In the event of a fault or error on
one of the two inverters, the healthy device will automatically assume MASTER status and start operating in stand-alone mode. To
activate the changeover function it is not necessary to set any parameters in the menu because Sirio automatically detects the presence
of a secondary device once the electrical connection has been made.
The "Pmin" and "Dp start" values set must be the same for both devices.
SIRIO X4
It is possible to connect up to 4 Sirio inverters through the "Sirio X4" interface module. In this case, the communication cables are not
directly connected between the two inverters but are all connected to the interface module which enables them sequentially.
PROTECTION MODULE
To avoid damage to the inverter a protection module is available and may be installed on the power supply line. This will automatically
disconnect the Sirio from the electrical network in the case of power supply anomalies. Contact an authorised dealer for further
information.
Installation and connection in twin booster sets
INSTALLATION: install each Sirio unit on the pressure line of the
corresponding electric pump. Connect the outlet union of each inverter to the
delivery manifold without interposing a check valve. Connect the suction of the
electric pumps to the common intake manifold, interposing a check valve for
each pump to prevent it from emptying when stopped. Sirio is compatible with
both vertical and horizontal installation.
CONNECTION: the two Sirio units are connected by an unshielded 4x0.5
mm2 cable as shown in the diagram beside. The maximum cable length is 100
cm including stripped ends.
Customers can order a preassembled connection cable with terminals and cable
numbering - Ref. SR-CBL4X05-100). If no cable is connected the device will
function in stand-alone mode.
MASTER STATUS: when the device works as a
MASTER it is sensitive to pressure changes in the plant
and thus capable of starting and stopping the pump unit
and modulating pump rpm in accordance with water
demands from the plant.
SLAVE STATUS: when the device works as a SLAVE
two capital S characters appear on the display bottom
line; in this condition if the pump is running the speed
remains constant, while if the pump is stopped its
starting is inhibited even when the taps are opened.
16
1.0 BAR
[ 40Hz]
1.0 BAR
S 40HzS