Type / N.
Rev.
Data
Page
Total pages
EW095.605
5
November 2010
28
96
EsiWelma
s.r.l.
4.4
System structure
If the control unit UCE40
…
is fitted with the optional battery load and protection card, to
order at the same time as the actual control unit with code UCE40MPA-CPB, it can provide
a power supply to external devices up to a power consumption of 30W with a tolerance of
1W. Above that limit it is necessary to use an external uninterruptible power supply (UPS).
The first case is “basic structure”, the second is “extended structure”.
4.4.1
Basic structure
Fig. 4.10 shows a possible application of a basic structure including three methane gas
detectors, one carbon monoxide detector, one relay module, one audible alarm, one gas
shut-off valve and one visual alarm.
Fig. 4.10 – Basic structure of the system (example)
The electrical connections between control unit and field devices must be made as
shown in Figs. 4.1
÷
4.3; the power supply cable and the communication cable must be
connected according to the instructions shown in the figures dedicated to recognising the
terminal boards.
URG40..
(1,6W)
URG40..
(1,6W)
URG40..
(1,6W)
MAR40
(2,5W)
UCE40
Bus
+
URO40..
(0,7W)
7Ah battery
M
Boiler
Solenoid valve
12W
Siren
2W
Lamp
2W
12 Vdc
Power supply (12 Vdc)
