SMA SB 3300TL - Manual (Page 51)

SMA Technologie AG Technical Documentation
Operating Instructions SB3300TL-11:FE1905 Page 47
L<->N L and N mixed up on AC connection. Have an installer check instal-
lation.
Offset Grid monitoring self-test failed.
Rechner Failure in operation of one of the two microcontrollers
Relais1
Relais2
Relais3
Relais4
L-Netz/
N-WR/
N-Netz Grid connection relay self test failed. The Sunny Boy checks the re-
lays that connect the Sunny Boy to the grid before it starts feeding
to the grid. In case the grid relays do not function correctly the safe
and reliable disconnection cannot be guaranteed and the Sunny
Boy does not connect to the grid. Contact SMA in case this failure
often occurs.
Riso The PV-system is not electrically separated from ground. The resis-
tance between one of the poles and ground is below a defined
threshold.
Shutdown Serious failure, device shut down until next switch-on.
ROM The internal test of the Sunny Boy control system firmware failed.
Contact SMA in case this failure occurs often.
Uac-Bfr/
Uac-Srr The AC grid voltage is exceeding the permissible range („Bfr“ or
„Srr“ is an internal message and is not important for the user). Uac
can result from:
• a disconnected grid (circuit breaker, fuse)
• a disconnected AC cable
• high-resistant AC cable
The Sunny Boy 3300TL assumes that the public grid is down and dis-
connects from the grid in order to avoid islanding. Check the grid
voltage and the grid cable connection in the Sunny Boy enclosure.
If the grid voltage is out of range due to your local grid conditions
consult the utility company if it is possible to modify the utility con-
ditions.
If the grid voltage is within the tolerable range and the failure mes-
sage „Uac-Bfr“ or „Uac-Srr“ is still displayed, contact SMA.
UDiff
Uzkposneg<10 Defective DC link. Contact SMA in case you observe this failure of-
ten.
Failure Code Descripition