ABB UNO-DM-3.3-TL-PLUS Product Manual page 129

Country Standard
By accessing to the Country Standard sub-menu you can modify the
grid standard within 24 hours while the inverter is operating.
After the grid standard was set you have 24 hours to make any changes to the grid standard
value; 24 hours later the Country Standard sub-menu will be locked, and any subsequent
changes can only be made accessing with Adim Plus privileges. Refer to the dedicated
section on this topic in the manual to know how to unlock the Country Standard sub-menu.
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7 - Operation