37
Table 3.1 Calculation of the cable signal delays
Radiator
number
Total cable
length L(m)
Cable length
difference L
MAX
-L(m)
Cable signal delay
per meter (ns/m)
Signal delay
difference (ns)
Delay switch
position
1
30+20=50*
50 - 50 = 0
5.0
0*5.0 = 0
0/25 = 0
2
30
50 - 30 = 20
5.0
20*5.0 =100
100/25 = 4
3
20+20=40
50 - 40 = 10
5.0
10*5.0 = 50
50/25 = 2
4
20
50 - 20 = 30
5.0
30*5.0 =150
150/25 = 6
5
30+20=50*
50 - 50 = 0
5.0
0*5.0 = 0
0/25 = 0
6
30
50 - 30 = 20
5.0
20*5.0 =100
100/25 = 4
* L
MAX
=50 m
3.7.2 System with two or more transmitters in
one room
When radiators in one multipurpose room are
connected to two transmitters, an extra signal delay is
added by:
Transmission from master transmitter to bypass
transmitter (cable signal delay)
Transmission through the bypass transmitter.
Use the following procedure to determine the delay
switch positions in bypass mode:
1
．
According to the procedures for a system with one
transmitter, calculate the cable signal delay for
each radiator in Hall-1 and Hall-2;
2
．
Calculate the signal delay between the master and
the bypass transmitter (Table 3.2);
3
．
Add the master-to-bypass signal delay to each
radiator connected to the bypass transmitter in
Hall-2;
4
．
Determine the maximum signal delay;
5
．
For each radiator calculate the signal delay
difference by subtracting the cable signal delay
from the maximum signal delay;
6
．
Divide the signal delay difference by 25. The
rounded off number is the signal delay switch
position for the radiator;
7
．
If needed, add delay switch positions to radiators
under a balcony (see section 3.7.3);
8
．
Set the delay switches to the calculated delay
switch positions.
Figure 3.17, table 3.2 and table 3.3 illustrate the
calculation of the extra master- bypass signal delay.
Note:
The used cable signal delay per meter is only serving as an example. For your calculation, use the
actual signal delay per meter value specified by the cable manufacturer.
Note:
If a master-bypass mode is used for two
rooms that are always separated, the delay
switch positions can be calculated separately
for each system and the delay caused by
transmission from master to bypass
transmitter can be ignored.
