SMA SB 3300TL - Manual (Page 52)

Technical Documentation SMA Technologie AG
Page 48 SB3300TL-11:FE1905 Operating Instructions
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 permissible 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 grid’s 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 connecting the Sunny Boy to the grid. If the grid im-
pedance is out of range due to your local grid conditions consult
the utility company if it is possible to modify the utility conditions.
Failure Code Descripition