SMA SB 4200TL Multi-String - Manual (Page 50)

Technical Documentation SMA Technologie AG
Page 50 SB4200-12:FE4804 Operating Instructions
6.4.5 Failure Messages
In case of a failure the Sunny Boy 4200TL Multi-String generates the failure code ac-
cording to the operating mode and the detected failure.
Failure Code Descripition
CAN
Kom DC-BFS
DC-BFS-Startup Internal communication failure. Contact SMA in case you observe
this failure very often.
DC-A def.
DC-B def. DC input is defective. Contact SMA in case you observe this failure.
DCBFS Version The DC-BFS has a wrong firmware. Contact SMA in case you ob-
serve this failure.
Delta Bfr-Srr
NUW-dI
NUW-FAC
NUW-UAC
NUW-ZAC
NUW-Timeout Internal measurement comparison error: The Sunny Boy 4200TL
Multi-String measured values of BFR and SRR are too different from
each other.
dFac-Bfr
dFac-Srr The rate of change of the AC grid frequency is exceeding the per-
missible range („Bfr“ or „Srr“ is an internal message and is not im-
portant for the user). The Sunny Boy assumes that the public grid is
down and disconnects from the grid in order to avoid islanding.
Check the grid frequency and the rate of fluctuation. If the grid fre-
quency fluctuates often and you therefore often observe „dFac-Bfr“
or „dFac-Srr“ consult the utility company and ask if it is permissable
to change the grid monitoring parameters of the Sunny Boy. Con-
tact SMA about how to change the grid monitoring parameters of
your Sunny Boy.
dI-Bfr
dI-Srr The Sunny Boy 4200TL Multi-String has detected a drastic change
of the discharge current. As the Sunny Boy 4200TL Multi-String is a
transformerless inverter there is no electric separation. A sophistica-
ted and effective discharge current monitoring is an important ele-
ment of the personnel protection.
A drastic change of the discharge current can be the result of a mal-
function or a sudden dangerous ground fault and the Sunny Boy
disconnects all poles (DC and AC). Have a qualified technician
check the isolation and the ground connection in case you observe
„dI-Bfr“ or „dI-Srr“ without any obvious cause in your system.