13
11/2012
TCS TürControlSysteme AG, TCS Hotline Germany: +49 (0) 41 94/ 9 88 11 88
Subject to technical changes.
FAX: +49 (0) 41 94/ 9 88 129
Mail: [email protected]
PI_PUK-uk 1 A
General information on the conduit in TCS audio systems
The conduit is determined by structural conditions and is limited only by its length.
Observe when selecting the cable length: the
loop resistance must not exceed 20
Ω (table)
To keep the max. permitted loop resistance, the
cross-section of the wire can be doubled, that
means, for one wire two lines are used (illustra-
tion). The lines must be twisted.
when using shielded lines: connect the shields
with each other and connect one side to ground
(b-wire) at the power supply
optional strand or star formed wiring
Table: loop resistances
cable length
in m
cable 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
8.93
5.00
80
10.20
5.71
90
11.48
6.43
100
12.76
7.14
150
19.13
10.71
200
25.51
14.29
250
17.86
300
21.43
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).
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.
