SMA SUNNY ISLAND 5048-US - Grid Failure; Faults

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132 SI5048U-TUS121440 Technical Description
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128)) or the main power 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”Voltage and Frequency Limits” (page127)).
In case of a grid fault/failure, the main power grid is disconnected and the inverter is started from
silent mode.
14.2.8 Faults
Reverse Power
If the defined reverse power (”232.09 GdRvPwr” parameter) is exceeded for the time
”232.10 GdRvTm”, the grid is disconnected. After reverse power, connection is blocked for at least
”231.03 ExtLkTm”.
Grid Failure
If a grid failure is detected (failure at the master phase), the grid is disconnected immediately.
Grid Phase Failure
The failure of a phase (e.g. broken fuse) on a slave device is treated as a phase failure. The slave
device then disconnects this phase. If the phase is detected as being available again, it is reconnected.
The phase failure on the master device is treated as a grid failure (see above).
Slave Device Failure
If a slave device fails, the system continues to operate using the remaining devices of the cluster.
Waking Up from the Silent Mode
If the Sunny Island is in silent mode when there is a public grid failure, there is a short grid
failure in the off-grid power system (see section 13.4.5”Silent Mode” (page111)).