SMA SB 4200TL Multi-String - Manual (Page 53)

SMA Technologie AG Technical Documentation
Operating Instructions SB4200-12:FE4804 Page 53
Uzwk Overvoltage on the DC input.
Disconnect the Sunny Boy from the PV Modules immediately! The
Sunny Boy can be severly damaged!
Have your plant configuration checked before you reconnect the
DC voltage.
Watchdog
Watchdog Srr Internal Watchdog function triggered.
Zac-Bfr/
Zac-Srr The AC grid impedance is exceeding the permissable range („Bfr“
or „Srr“ is an internal message and is not important for the user).
The Sunny Boy assumes that the public grid is down and disconnects
from the grid in order to avoid islanding.
The impedance is the sum of the grids internal impedance and the
impedance of the AC cable that connects the Sunny Boy to the grid.
Check the grid impedance and the grid cable connection in the Sun-
ny Boy enclosure. Use a cable with a higher cross section (=lower
impedance) for connection of the Sunny Boy to the grid. If the grid
impedance is out of range due to your local grid conditions contact
the utility company and ask if it is possible to modify the utility con-
ditions.
Failure Code Descripition