SMA Sunny Boy Control Light - Manual (Page 73)

Sunny Boy Control Light Chapter 7: Appendix
SUNBCL-11:NE
- 73 -
SMA Regelsysteme GmbH
In the following please find the most important causes for Powerline transmission
faults and an overview of possible counter-measures (interference suppression). In
case of transmission errors between Sunny Boy Control Light and the connected
devices please read this chapter first and try to find the failure source by carrying out
the steps described in chapter 7.2.2: "Interference Suppression".
Strong Damping of the Carrier Signal
Most frequently transmission errors result from carrier signal damping. The reason for
this may be a too long distance between the inverters and Sunny Boy Control Light
however, often there are electric devices connected to this cable. Devices with a high
input capacity may dampen the carrier signal strongly, and it is not necessarily
important whether the device is on or off. Examples are washing machines, electric
ranges, microwave ovens, PCs, fluorescent lamps etc.
The easiest counter-measure is to connect the respective electrical devices to
another line resp. to another phase. Another possibility is to install a special filter in
the power supply of the interfering electrical devices.
If, in extreme cases, the wiring length resp. wiring arrangement is the cause for a
disturbed communication, the installation of a separate line from the inverters to the
Sunny Boy Control Light can be necessary.