Table of Contents
Advertisement
When choosing the cable length observe: the loop resistance a-b and M-P should not
exceed the maximum of 8 Ω (table 1).
If the loop resistance exceeds 8 Ω: plan multiple wiring of the lines (double twisted
strands).
Optional strand or star formed wiring.
Do not use more than 6 video indoor stations per strand. For systems with more video
indoor stations plan the use of video distributors (FVY1200, FVY1400).
Up to 64 front-door stations (16 of them with video) and almost an unlimited number of
indoor stations can be connected polarity-free (a/b) within one system (polarity-free only
in 6-wire operation). For this, a suitable power supply and control unit has to be used.
Table 1: loop resistances
cable length a-b/ M-P
in m
10
20
30
40
50
60
70
80
90
100
Principle loop resistance
Rule:
None of the devices (AS, IS or FE) should each be
8 Ohm
further than
away from the power supply
control unit (VS).
8 Ohm:
around 65 m distance AS-VS by 0.6 mm diameter
around 115 m distance AS-VS by 0.8 mm diameter
TCS TürControlSysteme AG
Mail: info@tcsag.de
4
cable diameter
0.6 mm
loop resistance in Ω
1.22
2.45
3.67
4.90
6.12
7.35
Measurement loop resistance
Rule:
Switch off 230 V / 50 Hz of the VS.
Install a-b short-circuit at the VS.
All other devices do not disturb the measurement
and can stay connected.
0.8 mm
0.69
1.38
2.07
2.76
3.44
4.13
4.82
5.51
6.20
6.89
short-circuit a, b
here
Subject to technical changes.
PI_IMM2300_Art0031160-uk.doc
09/2011
Advertisement
Table of Contents
