Cables - Siemens Desigo TRA Mounting And Installation Manual

Bus lines
Bus cable selection
Bus cable screening
Bus cable: KNX
specified.
Network with internal
PXC3 power supply
Network with external
power supply
Polarity
Siemens
Building Technologies
9.3

Cables

The bus lines (= wired pair) are connected via PL+ (red) and PL– (black).
PL+
PL-
Choose the bus cable as per country-specific offerings. Comply with values
indicated in this document under "Technical data PL-Link".
AC24V can be provided in the same (2 x 2 stands) or in a separate cable.
Recommended bus cable are available on the KNX homepage under Downloads /
Support – 06 KNX Certification – 02 KNX Certified Products – Cable:
http://www.knx.org/downloads-support/downloads/:
Commonly used cable sizes:
– 1 x 2 x 0.8 mm (e.g. Belden YE00819 or YE00905).
– 2 x 2 x 0.8 mm (e.g. Belden YE00820 or YE00906).
In TRA plants, bus cables without screen are permitted. The screens available for
bus cables do not need to be connected.
If interference is expected on the PL-Link (KNX) bus, use a cable with screen.
Connect the screen as per standard installation rules.
The indications for distances and line lengths in a network are designed for bus
cables specified by KNX.
Comply with the following distances for a PL-Link network with the PXC3 internal
power supply:
• Distance between bus device and internal supply
• Distance between bus devices
• Total length of all lines on one line
Comply with the following distances for a PL-Link network with external bus power
supply (PSU) (see Section 9.1.2):
• Distance PSU to PXC3 with switched off internal supply
• Distance bus device to next PSU
• Distance between two PSU operated in parallel
Min. 0 m for the new Siemens power supply modules recommended
in section Fehler! Verweisquelle konnte nicht gefunden werden..
• Distance between bus devices
• Total length of all lines on one line
Important: The bus conductors must NOT be inverted.
(terminals PL+ and PL–).
Mounting and installation
PL-Link room bus
PL+ AC 24 V
PL-
Max. 350 m.
Max. 350 m.
Max. 350 m.
Min. 0 m.
Max. 350 m.
Min. 200 m.
Max. 700 m.
Max.1000 m.
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2013-02-23