10/2012
9
TCS TürControlSysteme AG, TCS Hotline Germany: [email protected]
Subject to technical changes.
FAX: +49 (0) 41 94/ 9 88 129
PI_AVC11010-uk 1A
Do not use more than 20 video indoor stations per strand. In systems with more video
indoor stations plan to use video distributors (FVY1200, FVY1400).
Up to 64 front-door stations (16 from them video front-door stations) and an unlimited
number of indoor stations can be connected polarity-free (a/b) in one system (polarity-
free only with 6-wire operation). Therefore a suitable power supply and control unit is to
be used.
Table 1: Loop resistances
line
length
a-b/ M-P
in m
line diameter
0.6 mm
0.8 mm
loop resistance
in
Ω
10
1.28
0.71
20
2.55
1.43
30
3.83
2.14
40
5.10
2.86
50
6.38
3.57
60
7.65
4.29
70
5.00
80
5.71
90
6.43
100
7.14
Principle loop resistance
Measure loop resistance
None of the devices (AS, IS or FE) should be fur-
ther than 20 Ohm away from the power supply and
control unit (VS).
Rule:
Switch off the 230 V / 50 Hz of the VS.
Install a-b short-circuit at the VS.
Other devices are not disturbing the measure-
ment, they can stay connected.
Measure the resistance at a/b at the last IS or AS.
8 Ohm:
max. 65 m distance AS-VS by 0.6 mm diameter
max. 115 m distance AS-VS by 0.8 mm diameter
AS front-door station
VS power supply and control unit
IS
indoor station
FE
extended function
a, b short-circuit
here
