Italtecnica Sirio Manual Del Usuario página 23

5.5 Motor selection
5.6 Minimum voltage
5.7 Maximum voltage
5.9 Debug Variable
(1.2)Minimum frequency: this parameter defines the minimum frequency at which the pump starts up and stops. For
Min.fre.
three-phase pumps a value of 25Hz is advised, for single-phase pumps 30Hz.
25 Hz
Also consult the information supplied by the manufacturer of the electric pump to determine at what minimum frequency
value the connected electric motor can operate
(1.3)Stop frequency: only during operation without the flow switch, this parameter determines the minimum frequency
Stop fr
value below which the motor will stop. During adjustment, if the Pmax pressure value is reached and the frequency of
30 Hz
the motor is below this value, the inverter will attempt to stop the motor. If all the utilities are closed and the pressure
remains constant the pump will stop correctly. If the pump does not stop, try to increase this value. By contrast, if the pump carries out
continuous start-up and stop cycles, try to lower the stop frequency value.
(1.4)Nominal motor frequency: depending on which motor is used, it is possible to select a maximum nominal output
Nom.fre.
frequency from the inverter (50 or 60 Hz). Caution: an incorrect selection of the maximum frequency may cause damage
50 Hz
to the pump; consult the manufacturer's technical data carefully.
(1.5)Switching frequency: set the frequency of inverter switching. The selectable values are 3, 5 and 10 kHz. Higher
Swit.fr.
switching frequency values may reduce the noise of the inverter and allow a more fluid regulation of the motor but may
5 kHz
cause increased temperatures in the electronic board, an increase in electromagnetic disturbances and potential damage
to the electric motor (especially with long cables). Low switching frequency values are recommended for medium-large pumps, where
there is a long distance between the inverter and motor or high ambient temperatures.
(1.6)Frequency correction: this parameter enables entry of a deviation, positive or negative, of the maximum requency
Fre.cor.
compared to the set nominal value. It may be useful to set a negative deviation (up to –5Hz) where a limit to the
0 Hz
maximum power of the electric pump is wanted and to avoid possible overload. A positive increase (up to +5Hz) may
instead be necessary when a slightly higher electric pump performance is needed. While no particular precautions exist in lowering the
maximum frequency, its increase must be carefully evaluated after having consulted the manufacturer of the electric pump and taking
into consideration the maximum current supported by the inverter.
S.Start
(1.7)Soft-Start (progressive start-up): This screen enables the user to activate or deactivate "soft-start" function. When
ON
this function is active the pump starts up progressively; by contrast, the start-up is always at maximum revs for a period
of 1 second before the adjustment of revs begins.
(2.0)Flow sensor: this activates or deactivates operation of the integrated flow switch. The factory setting of the flow
Flow.se
switch is active, so that the pump will stop when the valves close, detecting a zeroing of the flow through the inverter.
ON
The same principle is used for the protection against dry-running. In any case, conditions may occur (for example, the
use of not perfectly clean water) which could impair correct operation of the flow switch preventing the pump from stopping correctly.
In these conditions, it is possible to deactivate the flow switch and operate the Sirio exclusively on the basis of pressure and frequency
information.
In this case it is essential to correctly regulate the parameters of the stop frequency and dry-running pressure for efficient operation of the
inverter. Furthermore, when the flow switch is deactivated, it is necessary to install an expansion tank immediately after the Sirio to help
regulate the pressure in the stop phase and avoid continuous restarts of the pump, taking care to periodically check the pre-load values.
(2.1)Command origin: selects the command source. If the parameter is set to pressure, the operation is regulated
Command
automatically based on the system pressure. Otherwise, if set to manual mode, it is possible to manually command start-
PRES
up, stop and the speed of the electric pump directly via the keyboard. Caution: in manual mode, the dry-running and
pressure limitation protections are not active. This mode should only be used temporarily and under the direct control of a person. Pay
maximum attention during these operations!
(2.2)Auxiliary contact: use this parameter to select the function to be associated with the auxiliary contact; the settable
Aux.con
values are as follows:
1 <->
"1 <->" the auxiliary contact is used for the connection of two Sirio devices in a twin pressurisation unit (factory
settings)
"2 <-" the auxiliary contact is used to remote control the start/stop of the motor pump.
"3 X2" the auxiliary contact is used to control a second pressure set-point (Pmax2).
In the section "AUXILIARY CONTACT CONNECTION" further information about the methods of electrical connection and three
different modes of operation is available.
Reserved for IPM motors (permanent magnets)
Minimum power supply voltage threshold
Maximum power supply voltage threshold
Debug variable selection for process value display
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IT EN PT RU DE ES FR RO