Principle Loop Resistance; Measurement Loop Resistance - TCS K30001 Product Information

 Please observe when selecting the length of the lines: the loop resistance a-b and M-P
must not exceed 8 Ω (table 1).
 Loop resistance > 8 Ω: plan multiple wiring of the strands (double twisted lines).
 Optional strand or star shaped wiring
 Do not use more than 20 video indoor stations per strand. For systems with more video
indoor stations, plan to use video distributors (FVY1200, FVY1400).
 Up to 64 front-door stations (16 of them video front-door stations) and almost an unlim-
ited number of indoor stations can be connected within one system polarity-free (a/b |
polarity-free only in 6-wire operation). Thus, a suitable power supply and control unit is
to be used.
Table 1: loop resistances
Length of the line a-b/ M-P
in m
10
20
30
40
50
60
70
80
90
100

Principle 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).
8 Ohm:
max. 65 m distance AS-VS by 0.6 mm diameter
max. 115 m distance AS-VS by 0.8 mm diameter
TCS TürControlSysteme AG, TCS Hotline Germany: +49 (0) 41 94/ 9 88 11 88
FAX: +49 (0) 41 94/ 9 88 129  Mail: hotline@tcsag.de
24
Line diameter
0.6 mm
Loop resistance in Ω
1.28
2.55
3.83
5.10
6.38
7.65

Measurement loop resistance

Rule:
 Switch off the 230 V / 50 Hz of the VS.
 Install a-b short-circuit at the VS.
 All other devices are not disturbing the measure-
ment and can stay connected.
 Measure the resistance at the last IS or AS at the
strand on a/b.
AS front-door station
VS power supply and control unit
IS indoor station
FE extended function
0.8 mm
0.71
1.43
2.14
2.86
3.57
4.29
5.00
5.71
6.43
7.14
short-circuit
a, b here
Subject to technical changes.
PI_K30001-30004_uk 1A
01/2013