Inverter Operation SMA Technologie AG
Page 84 SI5048-11:EE4206 Technical Description
12.5 Automatic Frequency Adjustment
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 5048, also
referred to as a tertiary control, allows the trouble-free use of grid-connected clocks in
these types of stand-alone systems. This function is activated using the "#270.08
TertCtlEna" parameter (activated by default).
The time difference is somewhat compensated on average.
Messages can be displayed at any time while the device is in operation and they
have priority over the Home Screen display.
The internal clock in the Sunny Island 5048 is quartz-controlled and thus operates
correctly (within the tolerance limits). The adjustment refers to externally connected
clocks that depend on the grid frequency.
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