SMA WB 5000A-11 Installation - Manual (Page 55)

SMA Solar Technology AG Commissioning
Installation Manual WB5A_6A-IA-IEN114540 55
6.4 Operating States of the Inverter
Startup Procedure
If the inverter has enough voltage and power, the three LEDs on the inverter light up simultaneously,
indicating that the startup process is ongoing.
As soon as the DC input voltage reaches the value configured for the parameter "Vpv-Start", the
inverter trips several self-tests, measuring procedures and synchronization with the power distribution
grid. This operating state is indicated on the inverter by the flashing green LED.
Once the DC input voltage has reached the "Vpv-Start" value for the time configured in "T-Start" and
all the tests have been completed successfully, the inverter connects to the power distribution grid and
the green LED comes on permanently. The inverter then switches to characteristic curve operation, and
regulates the input current according to the generator voltage.
Characteristic Curve Operation
After the startup procedure, the inverter switches to characteristic curve operation and regulates the
input current according to the generator voltage.
The inverter then begins to exert a load on the small wind turbine system, draws power from the small
wind turbine system according to the input voltage present, and then feeds it into the power
distribution grid. The maximum power output corresponds to the maximum AC power of the inverter.
However, it can be reduced using the "Pmax" parameter.
Shutdown Procedure
If wind strength is so low that the DC input voltage falls below an internally calculated value, the
inverter stops feeding power to the power distribution grid for the period defined in "T-Stop". As soon
as DC input voltage increases again, the inverter switches back to characteristic curve operation.
If the DC input voltage remains below an internally calculated value for the time set in "T-Stop", the
inverter will switch off.
If the DC input voltage is no longer sufficient to supply the on-board electronics with power, the
inverter switches off immediately.