SMA America, LLC
12 Additional Functions
Technical description
SI4548_6048-US-TB_en-13
105
12.6 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
(parameter "250.01 AutoStr")
the Sunny Island can confirm
the fault automatically and restart on its own. If the fault persists, the Sunny Island cannot be started.
12.7 Automatic Frequency Synchronization
Clocks that depend on the stability of the power 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 off-grid systems that operate with a diesel generator.
The automatic frequency synchronization (German: AFRA) function of the Sunny Island allows the use
of clocks in these types of off-grid systems. This function is activated using the "250.11 AfraEna"
parameter.
The time deviation is compensated on average.
12.8 Time-Controlled Standby
You can set the Sunny Island to standby mode in a time-controlled way. Activate the time-controlled
standby using the parameter "250.13 SlpAtNgt". Set the parameter to "Enable".
After activation, set the start time and the stop time for standby. Carry out the setting using the
"250.14 SlpStrTm" and "250.15 SlpStpTm" parameters.
12.9 Behavior in the Event of a Failure in a Three-Phase System
You can influence how the Sunny Island reacts to failures occurring in a three-phase system using the
"250.30 RnMod" parameter. The parameter is set to "RunAlways" at the factory. This means that the
master ignores all faults at the slave devices.
If you set the parameter to "StopAlways", the system will be put in standby mode upon detection of a
fault at the slave devices. Faults which can be removed via an autostart are not included.
Automatic start meter
If the autostart meter has counted down to zero, the Sunny Island waits for ten minutes before
attempting to restart automatically.
Displaying messages
Messages can be displayed at any time while the device is in operation and they have priority
over the "Home Screen" display.
Quartz-controlled 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 power frequency.
Summary of Contents for Sunny Island 4548-US
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