SMA SC 500HE-US - Manual (Page 19)

SMA America, LLC 3 Product Description
Operating Manual SC500HEUS-eng-BE-BUS120320 19
Stop
The Sunny Central is switched off. If the stop/start switch is set to "Start", the Sunny Central switches
to the operating state "Grid monitoring".
Grid Monitoring
The Sunny Central is in the operating state "Grid monitoring". The grid limits will now be monitored
continuously. If the grid limits are exceeded during the monitoring time, the Sunny Central will restart
"Grid monitoring".
If a grid fault does not occur during the grid monitoring time, the AC contactor closes and the
Sunny Central switches to the operating state "Grid monitoring time reached".
Grid monitoring time reached
The Sunny Central is in the operating state "Grid monitoring time reached". If the input voltage V
PV
exceeds the value of the parameter "PvVtgStrLevMin", the Sunny Central waits until the time specified
in the "PvStrT" parameter elapses. If the input voltage V
PV
does not fall below the value of the
parameter "PvVtgStrLevMin" during this time, the Sunny Central checks whether the power distribution
grid is connected. If a valid power distribution grid is available, the Sunny Central switches to the
operating state "Startup".
The value of the parameter "PvVtgStrLevMin" must be adjusted to conform to the PV array connected
to the Sunny Central.
Startup
The Sunny Central is in the operating state "Startup". The Sunny Central moves to its initial operating
point and begins the feed-in process.
MPP load operation
In the MPP range, the Sunny Central feeds into the power distribution grid and permanently works at
the maximum power point (MPP). If the measured power during the time interval "PvPwrMinT" is below
the value of the parameter "PvPwrMin" or the stop/start switch is set to "Stop", the Sunny Central
switches to the operating state "Shutdown".
Shutdown
The Sunny Central is in the operating state "Shutdown". If the stop/start switch is set to "Stop", the
Sunny Central switches to the operating state "Stop". The AC contactor and the DC contactor open
automatically.
If the Sunny Central shuts down because the feed-in conditions have not been met, the Sunny Central
switches to the operating state "Grid monitoring".
Fault
If a fault occurs during operation, the Sunny Central switches off and the fault is shown on the display
(see section 10 "Troubleshooting", page 55).