Italtecnica Sirio Manuel D'instructions page 8

SETTING OF "AUXILIARY CONTACT" PARAMETER = "2" –Remote on/off control function
When the "AUXILIARY CONTACT" parameter is set on "2" the Sirio is set to be
switched on and off by remote control according to the system requirements. This function
is useful when there is the need to programme the start of the motor pump at the same time
as other devices connected to one same control unit, for example in irrigation systems
where the pump is switched on only when the irrigation control unit activates one or more
of the system's solenoid valve. Connect the device according to the wiring diagram shown
here, bearing in mind that when the external contact is open the Sirio shall not start the
pump even if the system reaches the Pmin value, while when the external contact is closed
the device shall operate according to the values set.
SETTING OF "AUXILIARY CONTACT" PARAMETER = "3" ––Second set-point(Pmax2) function
When the "AUXILIARY CONTACT" parameter is set on "3" the Sirio is set to adjust the
rotations of the motor pump in accordance to the Pmax2 pressure value. This function is
useful when the device must temporarily work at a different pressure to the one set in the
Pmax parameter, for example if distributors requiring different pressures are used. Connect
the device according to the wiring diagram shown here bearing in mind that when the
external contact is open the Sirio shall adjust the pump rotations according to the Pmax
pressure value , while when the external contact is closed the device shall adjust the pump
speed according to the Pmax2 value.
ATTENTION: incorrect wiring of the auxiliary contact may cause the low voltage circuit to short circuit with
consequent blowing of the fuse! Carry out the connection with particular care.
AUXILIARY I/O BOARD
To insert the auxiliary I/O board, use a flat screwdriver to lift and break the plastic window as shown in the following figure.
Then insert the expansion board, taking care to align it perfectly with the display board pins.
The connection terminal is removable and may be connected to the I/O board after having carried out the electrical connections.
The expansion board provides an auxiliary input and output. Refer to the documentation supplied with the board for the
electrical characteristics and method of connection.
CAUTION: The auxiliary I/O board is separated from the main network through a "principal" insulation type (basic
insulation according to EN 60730-1). Any circuit connected to this terminal will acquire the same level of insulation with
respect to the mains power supply. For this reason the connections must be carried out with a cable type that guarantees
the additional insulation.
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EXTERNAL
CONTACT
EXTERNAL
CONTACT