Step a) switch on the storage syste

Step a) switch on the storage system with AC voltage respectively less than 85% and greater than 110% of the nominal value Vn (while the frequency must be between 49.90 Hz and 50.10 Hz), and check that the unit prevents the parallel with the grid – no power supply/consumption according to network analyser reading.Step b) After at least 30 s from the time of start of the test referred to in point a), check the persistence of the state "open", i.e. absence of output power supply / consumption. At this point bring the voltage within the limits - 85 % Vn and 110 % Vn - and simultaneously disable the storage system. In these conditions then proceed to reset, while checking that the parallel with the network and the starting of the power supply/consumption does not take place before at least 30 s from the time the storage system is enabled.