ID-E270-011GB
45
C
72
min – minimum battery capacity ensuring the control panel operation for 72 h in the quiescent
mode and 0.5 h in the alarm mode.
Table 5.11 presents an exemplary calculation of the necessary battery cluster capacity depending on
the POLON 4900 control panel hardware configuration.
Table 5.11
Number
of MSL
modules
Number of
detection
lines
Current draw in
quiescent mode
Id
zew
= 0 A
Current draw in
alarm mode
Ia
zew
= 1 A
C
30
min
[Ah]
C
72
min
[Ah]
MSL-1M
1 X 20 mA
0.345 A
1.645 A
11.2
25.7
2 X 20 mA
0.370 A
1.670 A
11.9
27.5
3 X 20 mA
0.395 A
1.695 A
12.7
29
4 X 20 mA
0.420 A
1.720 A
13.5
31
MSL-1M,
MSL-2M
5 X 20 mA
0.525 A
1.825 A
16.7
38.7
6 X 20 mA
0.550 A
1.850 A
17.4
40.5
7 X 20 mA
0.575 A
1.875 A
18
42.3
8 X 20 mA
0.600 A
1.900 A
19
44
6 ADDRESSABLE DETECTION LINES
6.1 DETECTION LINE TYPES
The POLON 4900 control panel A type addressable detection lines are resistant to line wire faults
(short circuit or break). This immunity is ensured by: the loop-shaped line operation layout and built-
in short circuit isolators in the system addressable elements. Additionally, it is possible to connect a B
type (radial) open line, however, according to the applicable standards, more than 32 warning
devices must not be installed in this configuration.
In the loop-shaped layout, one line break does not eliminate any line element from operation. Having
detected a fault, the control panel indicates its occurrence and ensures the addressable detection
line is reviewed from both sides. After the break is removed, the signal informing about this fault is
automatically cleared.
A detection system operating in other layout than the loop is not resistant to line breaks. A break
results in disconnecting line elements from the fault location to the last element in the line.
As far as radial detection lines are concerned, in case a short circuit is detected, the isolator closest to
the short circuit is actuated and the line section behind this isolator is disconnected.
In the loop-shaped layout, if a line wiring short circuit is detected, two isolators in line elements
installed closest to the fault location are actuated, which triggers the disconnection only of the
