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Line filter
The line filter prevents crosstalk of the communication signals to other cables as well as
coupling of interference to the communication lines. This is particularly important when you
are supplying multiple segments from one carrier voltage or when you are operating multiple
carrier voltage transformers in a shared low-voltage network.
Figure 2-22
Application examples of the line filter
You must use a suitable line filter for decoupling the transformer from the segment.
Usually, one end on the filter is marked with "LINE" and the other with "LOAD". Connect the
end marked with "LOAD" to the powerline and the "LINE" end to the transformer.
Table 2- 9
Attenuation for common-mode signals and push-pull signals
between 1 MHz and 40 MHz
Output impedance (between 1 MHz and 40 MHz)
The isolation strength of the filter (especially against PE/FE) has to be matched to the isolation coor-
dination in the system.
NOTICE
In sliding contact systems with dangerous contact voltages, there is the risk of a short-
circuit between these voltages and the communication cables. This means you have to
design the isolation of all components to prevent such a situation.
The short-circuit mentioned above is then considered to be the first fault. It must not result
in a dangerous state.
The connected components must therefore have basic isolation. The dangerous contact
voltage is then considered the rated voltage.
Power Line Booster
Operating Instructions, 11/2019, A5E36203125A-AG
Requirements for the line filter
Device description
2.7 Accessories
≥ 50 dB
> 100 Ω
31
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