SMA SC 200 - Manual (Page 73)

SMA Solar Technology AG Islanding Detection (Anti-Islanding)
User Manual SC-BEN100262 73
13 Islanding Detection (Anti-Islanding)
In cases of grid failure the grid voltage drops. The Sunny Central detects this via grid monitoring and
switches off. In unfavorable circumstances there is the possibility that the Sunny Central is feeding the
grid with a certain output, for example 100 kW, while at the same time there is 100 kW load running
on the same grid branch. In this case, an island grid will be formed and the Sunny Central will supply
the 100 kW load. Here, the Sunny Central will measure its own voltage and, finding it equal to the
grid voltage, will not immediately disconnect from the grid. However, if the anti-islanding (island
detection) function is activated, the Sunny Central will detect the formation of an island grid and
disconnect from the grid within a few seconds.
DANGER!
Danger to life due to high voltages in the case of presumed disconnection from
the grid. Death or serious burns.
In a case such as that described above, voltage will still be present despite presumed
disconnection from the grid.
• SMA Solar Technology recommends activating the "Anti-islanding" option.
• Contact the Sunny Central Service if you wish to have the "Anti-islanding" option
activated.
• Always makes sure there is no voltage present before working on the Sunny Central
or the grid.