The technical standards for connection to the grid of photovoltaic systems (Ex.: VDE, CEI-021 etc..)require the inverters to disconnect from it when the frequency and voltage values are out of the connection range.
In this condition the inverters generate different warning signals, therefore it is necessary to check that the values it is working on during the signaling are within the parameters required by the standards and, if not, correct the system to be compliant to the guidelines.
REACT 2