EsiWelma Sensigas EW40, Инструкция по установке и эксплуатации

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Type / N.
Rev. Data Page Total pages
EW095.605 5 November 2010
24 96
EsiWelma
s.r.l.
The consumed power is calculated as follows:
P (total) = P1+P2+P3+ …… +Pn [Watt]
Current (total) = P(total)/12 [Amps]
The size of the power supply cable is calculated using the formula below, approximating to
the value closest to existing size. In all cases, the minimum distance must be no less
than 2.5mm²
Cable diameter = Current (total) / 3 [mm
²
]
If, for example, we consider the system in Fig. 4.10 fitted with:
•
three methane gas detectors
•
one carbon monoxide detector
•
one relay module
•
one solenoid valve
•
one siren
•
one visual alarm lamp
•
one buffer battery
The power and the consumed current are shown in table 4.3
CONSUMPTION Q.ty UNIT POWER TOTAL POWER TOTAL
CURRENT
URG40SS detector 3 1.6W 4.8W 0,4
URO40SS detector 1 0.7W 0.7W 0,058
Relay module MAR40 1 2.5W 2.5W 0,208
Solenoid valve 1 12W 12W 1
Siren 1 2W 2W 0,166
Lamp 1 2W 2W 0,166
Buffer battery 1 7W 7W 0,583
TOTAL 31W 2,581
Table 4.3 – Example of calculation of electricity consumption
The power supply cable size is:
S = 2.581 / 3 = 0.86 < 2.5mm²
Since the value calculated is lower than the minimum 2.5mm², the size of the selected cable
must be 2.5mm².
Since the total power of the system is
≤
30
±
1W, it is possible to power it through the control
unit fitted with optional load card and battery protection (control unit order number
UCE40MPA-CPB).