Transitioning
from backup
power mode to
feeding energy
into the grid
1. The inverter is operating in backup power mode. The contactors K1 and K2 to the
public grid are open.
2. Public grid available again.
3. The Fronius Smart Meter monitors the grid parameters on the public grid and
passes this information to the inverter.
4. The stability of the returned public grid is determined by checking the measured val-
ues of the Fronius Smart Meter.
5. The inverter ends backup power mode and disconnects the outputs.
6. The inverter deactivates K3. Power is restored to contactors K1, K2, K4 and K5.
7. All circuits are reconnected to the public grid and are supplied by the grid. The in-
verter does not feed anything into the grid at this time.
8. The inverter can start feeding energy into the grid again after performing the grid
checks required by the relevant standard.
43
EN
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