Automatic Frequency Adjustment - SMA Sunny Island 5048 Installation Instructions Manual

Inverter Operation
Messages can be displayed at any time while the device is in operation and they
have priority over the Home Screen display.

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.
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.
Page 84 SI5048-11:EE4206
SMA
Technologie AG
Technical Description