ENGLISH
62
GB
”OUT” of face C. The power supply cable is for connection to the power
mains.
Face E:
the 4 brass threads form the seat for the 4 support feet in the case
of horizontal installation. The 1” cap has the main function of emptying the
system. There are also 2 ventilation grids.
Face F:
as indicated by the label to be removed, the 1” cap has a dual
function: in the case of horizontal installation, the outlet that is closed by
the cap acts as the system’s loading door (see below “loading operations”,
par. 2.2.3); in the case of vertical installation, the same outlet can act as
the input hydraulic connection (exactly like the one marked “IN” on face C
and as an alternative to it). The user interface panel is composed of a dis
-
play and a keyboard and its function is to set the system, query its status
and communicate any alarms.
The system can be installed in 2 different configurations: horizontal (Fig.4)
or vertical (Fig.5).
1.1 Description of the Integrated Inverter
The electronic control integrated in the system is of the type with inverter
and it makes use of flow, pressure and temperature sensors, also integrat
-
ed in the system.
By means of these sensors the system switches on and off automatically
according to the utility’s needs and it is able to detect conditions of mal
-
function, to prevent and indicate them.
Figure 4
Figure 5
The Inverter control ensures different functions, the most important of
which, for pumping systems, are the maintaining of a constant pressure
value in delivery and energy saving.
•
The inverter is able to keep the pressure of a hydraulic circuit con
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stant by varying the rotation speed of the electropump. In oper
-
ation without an inverter the electropump is unable to modulate
and, when there is an increase of the request for flow, the pressure
necessarily decreases, or vice versa; this means the pressures
are too high at low flow rates or too low when there is an increased
request for flow.
•
By varying the rotation speed according to the instantaneous re
-
quest of the utility, the inverter limits the power supplied to the
electropump to the minimum necessary to ensure that the request
is satisfied. Instead, operation without an inverter contemplates
operation of the electropump always and only at maximum power.
The system is configured by the manufacturer to satisfy the majority of
installation cases, that is:
•
Operation at constant pressure;
•
Set-Point (desired value of constant pressure:SP = 3.0 bar
•
Reduction of pressure to restart:
RP = 0.3 bar
•
Anti-cycling function:
Disabled
However, these parameters and others can be set according to the sys
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tem. All the settable values are illustrated in the par. 5-6-7: pressure, inter
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vention of protections, rotation speed, etc.
There are many other operating modes and accessory functions. Thanks
to the different possible settings and the availability of configurable input
and output channels, it is possible to adapt the inverter operation to the
requirements of various systems. See 5-6-7.
1.2
Integrated Expansion Vessel
The system is complete with an integrated expansion vessel with a total
capacity of 2 litres. The main functions of the expansion vessel are:
Summary of Contents for DAB E.SYBOX
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