Additional Functions
SMA Solar Technology AG
90
SI5048-TEN093630
Technical Description
12.4 Overload and Short-Circuit Behavior
The Sunny Island can be temporarily operated under overload conditions. It can also supply short-
circuit currents.
In case of overload, the Sunny Island supplies an output of 6500 W for 30 minutes and can supply
7200 W for 5 minutes. The device can even supply 8400 W of output power for one minute.
If a short circuit occurs, the Sunny Island provides current of max. 100 A (for 100ms). This is sufficient
to trigger commercial 16 A B-type circuit breakers.
12.5 Device Faults and Autostart
If a critical fault occurs, the Sunny Island automatically shuts down and displays the reason on the
display. If the autostart function is activated ("250.01 AutoStr" parameter) the Sunny Island can
confirm the failure automatically and restart on its own. If the failure persists the Sunny Island cannot
be started.
12.6 Automatic Frequency Adjustment (AFRA)
Clocks that depend on the stability of the grid frequency for their accuracy become increasingly
inaccurate when there are constant frequency deviations. Frequency fluctuations, i.e., deviations from
the nominal frequency occur, for example, in stand-alone grid systems that operate with a diesel
generator.
The "Automatic Frequency Adjustment (AFRA)" function of the Sunny Island (also referred to as tertiary
control) allows the use of grid-coupled clocks in these types of stand-alone systems. This function is
activated using the "250.11 TertCtlEna" parameter (activated by default).
The time deviation is compensated on average.
Automatic Start Counter
If the autostart counter has counted down to 0, the Sunny Island waits for 10 minutes
before attempting to restart automatically.
Display of messages
Messages can be displayed at any time while the device is in operation and they have
priority over the Home Screen display.
Quartz Clock in the Sunny Island
The internal clock in the Sunny Island is quartz-controlled and thus operates correctly
(within the tolerance limits). The adjustment refers to externally connected clocks that
depend on the grid frequency.
Summary of Contents for SI 5048
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