Grid Failure; Disturbances - SMA SUNNY ISLAND 4548-US Operating Manual

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14.2.7 Grid Failure

A grid fault is characterized by the voltage or frequency being outside of the permissible limits (see
Section 14.2.5 "Grid Reconnection", page 132) or the utility grid being disconnected. In this case,
the time limits are relevant: smaller deviations are permitted for longer than large deviations (see
Section 14.2.1 "Limits of the Voltage Range and Frequency Range", page 130).
In case of a grid fault/failure, the utility grid is disconnected and the inverter starts from silent mode.
Waking up from the silent mode
If the Sunny Island is in silent mode when there is a utility grid failure, there is a short grid failure
in the stand-alone grid (see Section 13.5.5 "Silent Mode", page 114).

14.2.8 Disturbances

Reverse Power
If the reverse power (parameter "232.09 GdRvPwr") set for the time "232.10 GdRvTm" is exceeded,
the generator is disconnected from the utility grid. After reverse power, connection is blocked for at
least "231.03 ExtLkTm".
Failure of the Utility Grid
If a grid failure is detected (failure on the master line conductor), the utility grid is disconnected
immediately.
Operating Manual
14 Connecting External Sources
SI4548-6048-US-BE-en-21 135