WAGNER Titanus Micro-Sens, Technical Manual

Page: 99 / 238

TITANUS
MICRO·SENS
® Design
06/13 99
NOTICE
The higher figure of the total current calculated (I
total
) is used to design the
power supply!
The power consumption of the TITANUS
®
can be found in Chapter, "Techni-
cal Data".
The maximum line length results from the permitted line drop on the feed.
The permitted line drop is the difference resulting from the stand-by accus
discharge voltage (21.5 V) and the lower operating voltage limit of the aspi-
ration smoke detection system.
2
max

  

total
I
A U
L

Lmax
=
Maximum line length in [m]
A = Wire cross-section in [mm²]
Itotal = Total current of the aspiration smoke detection system in [A]
γ = Conductivity: Cu=57m/ Ω mm²
∆ U = Max.line drop on the feed
To guarantee the tightness of the housing seal, the appropriate cable
throughput for the particular cable must be selected.
▪ M 25- cable throughput: ∅ 9 to 14 mm
▪ M 20- cable throughput: ∅ 8 to 12 mm
The nominal capacity is calculated by means of the following formula:
25 . 1 ) 5 . 0 (
min
     
h I t n I K
total quiescent al no
Knominal = nominal capacity of the emergency supply accumulators [Ah]
t = required bridging time [h]
The factor 1.25 in the equation is only to be observed if bridging times are
smaller equal to [sic] 24 hours.
Line calculation
Emergency Supply
Calculation