SMA Sunny Boy Control Light - Manual (Page 77)

Sunny Boy Control Light Chapter 7: Appendix
SUNBCL-11:NE
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SMA Regelsysteme GmbH
Parallel-Working Mains Communication
The data transmission of the Sunny Boy Control Light uses a carrier frequency of
132 kHz. If other communication systems also use this frequency on the mains, the
transmission may be disturbed when exceeding a certain level. This can be affected
by the carrier frequency of an interphone, a babyphone or similar. In such a case the
communication systems will disturb each other.
Similar to devices generating interferences, the best solution is to separate the
transmission paths. But contrary to the case in the previous chapter, the suppression
of interference is not the problem in this case, because both communication systems
have to work simultaneously. That is why at least one of the systems should be
restricted to one phase resp. one wiring. This part of the electric installation may then
be supplied via a stop filter, which ensures that neither high frequency signals are put
in nor that the own carrier signal leaves this part of the electric installation. In case of
a strong coupling such a limitation of the transmission path and the use of a stop filter
might be necessary for both installed communication systems. By damping modules,
a further improvement can be reached, which completes the effect of the stop filter,
because these filters especially damp high frequency signals. Such a suppression
module should only be installed in parts of electric installations where no
transmission signals are desired at all.