SMA SUNNY BOY 5000-US Installation Manual page 79

SMA America, LLC
Error type
Interference
Interference
Interference
Interference
Interference
Warning
SB50US-80US-IA-en-36
Error code
VacL1-Ocu, VacL2-
Ocu, VacL1-Srr, VacL2-
Srr
VpvMax
!PV Overvoltage!
!Disconnect DC!
Watchdog
XFMR
XFMR_TEMP_F
XFMR_TEMP_W
Description
Voltage is too high or too low on the indicated
branch.
The DC input voltage is exceeding the maximum
tolerable value.
Disconnect the DC line immediately.
Watchdog for operation control triggered.
The transformer is connected to the wrong grid.
Check the connection of the transformer.
For grounded Delta grids: Monitor whether the
grid grounding conductor is connected to
terminal L2.
In the event of unbalanced load in 200 V and
240 V grids, swapping L1 and L2 may rectify the
fault.
High transformer temperature. The Sunny Boy
stops and the fans run at maximum speed.
After the reduction of the high transformer
temperatures, the Sunny Boy restarts. Monitor the
function of the fans.
SB50US-80US-IA-en-36
Troubleshooting
79