SMA SWR 850 - Manual (Page 9)

GB
The LEDs on the lid display the operating state the Sunny
Boy is in. For details please refer to the Sunny Boy 850
Technical Description. Description of the symbols used in the
following section:
Betrieb Operation
Erdschluss Earth Fault
Störung
Failure
Photovoltaik-Stringwechselrichter Photovoltaic string inver ter
SWR 850 Betrieb
Operation
Erdschluss
Earth Fault
Störung
Failure
LEDs on the front panel
Blink codes for failures
Grid failure:
The Sunny Boy displays a grid failure if the grid frequency,
grid voltage or the change of the grid frequency are out of
the tolerable range. Grid impedance too high:
The Sunny Boy has detected a failure based on non-per-
missible grid impedance values measured by the MSD.
Input voltage too high:
The Sunny Boy displays this blinking code if the PV input
voltage is above 250 V. Disconnect the grid and then the
PV-panels from the Sunny Boy immediately to prevent da-
mage! Device failure:
The Sunny Boy is in a condition that makes it impossible to
return to normal operation. It has to be checked by a qua-
lified technician.
LED off
LED blinks once per second
LED blinks fast (ca. three times per second)
LED is constantly on
not relevant
Operation
Earth Fault
Failure
Standby (night):
The input voltage is below 70 V and not yet
sufficient for normal operation.
Initialization:
The input voltage is not yet sufficient for
normal operation.
Stop:
The Sunny Boy is changing its operating
condition or is in a manually initiated con-
dition.
Waiting, checking grid:
Starting conditions are being checked.
Operation:
feeding grid, MPP or constant voltage
mode
Isolation failure:
earth fault of the PV-panels or failure of sur-
ge voltage protection (thermally monitored
varistors)
Failure:
internal or external failure, exact descrip-
tion depending on blink code