SMA SC 500HE-20 - Manual (Page 18)

3 Product Description SMA Solar Technology AG
18 SCxxxHE-20-BE-BEN111210 Operating Manual
Stop
The Sunny Central is switched off. "Stop" or "Remote control disconnection active" appears on the
display.
If the key switch is set to "Start", the Sunny Central switches to the "Grid monitoring" operating state.
Grid monitoring
The Sunny Central is in the "Grid monitoring" operating state. "Wait. valid AC grid" appears on the
display.
The grid limits will now be monitored continuously. If a grid fault does not occur during the grid
monitoring time, the AC contactor closes and the Sunny Central switches to "Grid monitoring time
reached" operating state.
If the grid limits are exceeded during the monitoring time T
grid monitoring
, the Sunny Central will
reactivate "Grid monitoring".
Grid monitoring time reached
The Sunny Central is in the "Grid monitoring time reached" operating state. "Wait. for PV voltage" or
"Warten auf EVU"* appears on the display.
If the input voltage U
PV
exceeds the start voltage "PvVtgStrLevMin", the Sunny Central waits until the
time specified in the "PvStrT" parameter elapses. If the input voltage U
PV
does not fall below the start
voltage "PvVtgStrLevMin" during this time, the Sunny Central checks whether the AC grid is connected.
If a valid AC grid is available, the Sunny Central switches to the "Startup" operating state.
The start voltage "PvVtgStrLevMin" must be adjusted to conform to the PV array connected to the
Sunny Central. Check and adjust the start voltage as necessary.
Startup
The Sunny Central is in the "Startup" operating state. "Operation" appears on the display.
The Sunny Central moves to its initial operating point and begins the feed-in process.
MPP Load Operation
In the MPP operating state, the Sunny Central feeds power into the grid and operates permanently at
the Maximum Power Point (MPP). "Operation" and the amount of fed-in power appears on the
display.
If the measured power PPV during the time interval T
Stop
is less than P
pvStop
or the key switch is set to
"Stop", the Sunny Central switches to the "Shutdown" operating state.
Shutdown
The Sunny Central is in the "Shutdown" operating state. "Operation" appears on the display.
If the key switch is set to "Stop", the Sunny Central switches to the "Stop" operating state. If the
Sunny Central shuts down because the feed-conditions have not been met, the Sunny Central switches
to the "Grid monitoring" operating state.
* The inverter is waiting for feed-in authoriziation from the grid operator.