SMA Sunny Boy Control - Manual (Page 143)

Sunny Boy Control
SMA Technologie AG
User Manual SUNBC - 14 : NE0206 139
Noise Signals in the Power Distribution
Data transmission uses a frequency of 132 kHz. If other devices generate signals in
the same range and above a certain level, they may interfere with the transmission.
Such noise signals can come from devices in your own household (e.g., poorly fil-
tered power converters), but also from devices in the neighborhood (e.g., high-
consumption power equipment).
Interference is best eliminated by isolating its source. Connecting the source of inter-
ference to another phase may be all that is needed. Alternatively, a wave trap may
be installed. Such a filter separates the part of the power network where the data
transmission takes place from the part of the power network where the interference is
generated. The efficiency of the wave trap can be further improved by installing a
frequency damper between the wave trap and the interfering device.
Betrie b Oper ation Erdsch luss Earth Fault Störun g Failure
Photovo ltaik -Strin gwe chselrichter Photovoltaic string inverter SWR 1100E Betri eb Operation Erdschlu ss Earth Fault Störun g Failure
Photovo ltaik -Stri ngwe chsel richter Photovoltaic string inverter SWR 1100E Betrieb
Operation Erdschlu ss Earth Fault Störung
Failure
Phot ovol taik-Stri ngwechselr ichte r Photo volta ic string inver ter
SWR 1100E
PAC 1273 W
Sunny Boy
Control
Damping
module
D
Connection
to utility
Block filter
House distribution
Fig. 9.11: Interference suppression in case of strong noise