SMA Sunny Boy Control - Manual (Page 140)

Sunny Boy Control
SMA Technologie AG
User Manual SUNBC - 14 : NE0206 136
9.2.1 Transmission Failures
Causes:
•
Transmission signal strongly dampened
− Transmission line too long
−
Adverse cable layout
•
Signal damping caused by other electrical devices
−
Anti-interference capacitors such as those found in fluorescent lamps
•
Insufficient phase coupling
−
Sunny Boy Control and Sunny Boy inverters connected to different phases
− Interference from external communication signals
−
Baby monitors etc. in the neighborhood
•
Interference from your own communication signals
−
Baby monitor
−
Intercom etc.
All of the above sources affect the quality of the transmission, but they do not neces-
sarily prevent Powerline communication. While in one household Powerline commu-
nication may be possible without a problem over several phases and a 90 m / 300 ft
line, in another one, there may be strong interference over a single phase and a
30 m / 100 ft line.
The following sections explain the most common causes for Powerline communication
failures and give possible countermeasures aimed at suppressing interference. In case
of a transmission failure between the Sunny Boy Control and a connected device,
refer to these sections first, and then try to find the source of the failure by carrying
out the steps described in section 9.2.2.