Siemens FS20 Planning Manual page 80

Planning detector lines
7
Planning an FDnet detector line
80 | 242
Building Technologies
Fire Safety
Verification
Verify the ↑ maximum current connection factor reserve by means of the diagram.
To do so, proceed as follows:
1. In the diagram for four loops, draw a vertical line at the address connection
factor AK = 18.
2. Draw a horizontal line in the intersection point with the 150 ohm curve.
3. Determine the maximum current connection factor reserve (MK_res). In this
example, it is 258.
4. Check whether the maximum current connection factor reserve (MK_res) is
higher than the calculated maximum current connection factor (MK). In this
example, the maximum current connection factor reserve (MK_res = 258) is
higher than the maximum current connection factor (MK = 200).
a The line may be operated in this way.
Exemplary diagram for a ↑ line card with four loops
MK_res
350
300
258
250
200
150
100
50
0
0
10
Figure 25: Example for the verification of the ↑ maximum current connection factor reserve (MK_res)
Information
The intersection point of AK and the resistance curve must be below the line
'MK_limit' (admissible range for the ↑ maximum current connection factor). Any
intersection points above that line are inadmissible.
If the maximum current connection factor reserve (MK_res) is lower than the
calculated maximum current connection factor (MK), the line must not be operated.
In that case, you will have to change the line assignment and calculate again.
30
18 20 40 50
008843_v_en_--
2015-12-15
60 AK