Italtecnica Sirio SR23251 Serie Instrucciones Para El Uso página 28

S E T T I N G O F " A U X I L I A R Y C O N T A C T " P A R A ME T E R = " 2 " – Remote on/off control function
Wh e n t h e " A U X I L I A R Y C O N T A C T " p a r a m e t e r i s
s e t o n " 2 " t h e 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 o n e o r m o r e o f t h e s y s t e m ' s s o l e n o i d v a l v e s .
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.
S E T T I N G O F " A U X I L I A R Y C O N T A C T " P A R A ME T E R = " 3 " – Second set-point
(Pmax2) function
Wh e n t h e " A U X I L I A R Y C O N T A C T " p a r a m e t e r i s
s e t o n " 3 " t h e 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.
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EXTERNAL
CONTACT
EXTERNAL
CONTACT