SMA America, LLC Troubleshooting
Installation Guide SB30-40US-IUS103030 79
Disturbance Imax Over current on the AC side. This failure code is
indicated in case the current to the AC grid exceeds
the specification. This may happen in case of harmfull
interference on the grid. If you observe “Imax“ often,
check your grid. For assistance contact SMA.
Disturbance K1-Close Relay test failed. Contact SMA for assistance.
Error K1-Open, K2-Open
Disturbance MSD-FAC, MSD-Idif Internal measurement comparison error: The internal
BFS and SRR processors are measuring different
values. Contact SMA for assistance.
Error MSD-VAC
Disturbance OFFSET Grid monitoring self-test failed. Contact SMA for
assistance.
Error ROM The internal test of the Sunny Boy control system
firmware failed. Contact SMA in case you observe
this failure often.
Disturbance Shut-Down Internal over current continuous. Contact SMA for
assistance.
Disturbance Vac-Bfr, Vac-Srr The AC grid voltage is exceeding the allowable
range. (“Bfr“ or “Srr“ is an internal message and is
not important for the user.) Vac can also result from a
disconnected grid or a disconnected AC cable. The
Sunny Boy assumes that the public grid is down and
disconnects from the grid in order to avoid islanding.
If the grid voltage is within the tolerable range and
you still observe the failure message “Vac-Bfr“ or
“Vac-Srr“ contact SMA.
Disturbance VacL1-Bfr,
VacL2-Bfr,
VacL1-Srr,
VacL2-Srr
Voltage is too high or too low on the indicated leg.
Disturbance VpvMax
!PV Overvoltage!
!Disconnect DC!
DC input voltage above the maximum tolerable limit.
Disconnect DC immediately!
Disturbance Watchdog Watchdog for operation control triggered. Contact
SMA for assistance.
Disturbance XFMR_TEMP_F High transformer temperature. The inverter will remain
stopped until the transformer has cooled.
Error Type Error Code Description
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