SMA SB 2800i - Manual (Page 41)

Operating Instructions Technical Documentation
SB2800i-11:FE0504 SMA Regelsysteme GmbH 39
Failure Code Description
dZac-Bfr
dZac-Srr The rate of change of 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.
If you therefore often observe „ dZac-Bfr“ or „ dZac-Srr“ consult the utility
company and ask if it is permissable to change the grid monitoring parameters
of the Sunny Boy. Contact SMA about how to change the grid monitoring
parameters of your Sunny Boy.
Riso The electric isolation of the PV system to the ground is leaking. The resistance
between one of the poles and ground is below a defined threshold.
Have the plant checked for ground faults. This can be defective cable crimpings,
cracked modules (especially when moist) or similar.
Imax Overcurrent on the AC side. This failure code is indicated in case the current to
the AC grid exceeds the specification. Have your plant configuration checked.
UpvMax PV input voltage above the tolerable maximum value
NUW-Mess
NUW-FAC
NUW-UAC
NUW-ZAC Internal measurement comparison error: The Sunny Boy 2800i measured values
of BFR and SRR are too different from each other.
K1-Schliess
K1-Trenn Relay test failed
EEPROM Transition failure during reading or writing of data EPROM, the data is not
essential for safe operation - this failure does not effect performance.
EEPROM dBh Data EPROM defective, device is set to permanent disable due to the fact that the
data loss affects important functions of the Sunny Boy. Contact SMA.
Offset Grid monitoring self-test failed.
Rechner BFR or SSR controller failure
ROM The internal test of the Sunny Boy Control system firmware failed. Contact SMA
in case you observe this failure often.
Watchdog Internal Watchdog function triggered
Iac-DC-Offs DC injection to high
EeRestore One of the two data records of the EEPROM was defective and has been repaired
without loosing data.