SMA Sunny Boy Control - Manual (Page 144)

Sunny Boy Control
SMA Technologie AG
User Manual SUNBC - 14 : NE0206 140
Multiple communication networks using the same frequency
The Sunny Boy Control uses a carrier frequency of 132 kHz for data transmission. If
other communication systems feed the same or a similar frequency into the power
network, exceeding a certain level, that may disturb the data transmission of the
Sunny Boy Control. Intercoms, baby monitors, etc. are possible culprits. Such devices
are also likely to interfere with each other.
In this case, as with devices that generate noise, the best solution is to separate the
transmission paths. However, in this case, it is not desirable to dampen the interfering
signal, since all communication systems have to be allowed to operate simultane-
ously. Instead, at least one of the communication systems should be restricted to one
phase or line. Installing a wave trap can then ensure that no high-frequency signals
are entering or leaving this part of the power network. In the presence of strong
phase coupling, each communication system may have to be isolated as described
above. Adding frequency dampers that complement the wave trap may further im-
prove the situation, but they should only be installed to parts of power network where
no transmission signals are desired.
Betrieb Opera tion Erdschluss
Earth Fault Störun g Failure
Photovoltaik -Stringwechselrichter Photovoltaic string inverter SWR 1100E Betrieb Operation Erdschluss Earth Fault Störung
Failure Photovoltaik -Stringwechselrichter Photovoltaic string inve rter SWR 1100E Betrieb
Operati on Erdschluss Earth Fault Störu ng Failure
Photovolt aik-Str ingwe chsel richte r Photovo ltaic string inve rter
SWR 1100E
PAC 1273 W
Sunny Boy
Control
Damping
module
D
Connection
to utility
Block filter
House distribution
Interfering device
Fig. 9.12: Suppressing interference from multiple communication systems