20If the equipment has external power, the working screen will appear directly.If the equipment is powered by batteries, the display will be off, and by pressing the (Escape)key for one second, the working screen will appear.The "Installation" option allows to configure the instrument, in order to obtain a correctindication. It is explained in Chapter 6 of this manual.The "Programming" option allows to program all parameters of the converter, as explained inChapter 7 of this manual.“Language” option selects the language in which all menus will be displayed.Number of menú itemsSelected itemThe options "Firmware Version" and "Serial Number" are informative and are discussed inChapters 8 and 9 of this manual.Finally, "Contrast" option allows to regulate the contrast of the information on the screen, toadapt it to the ambient light of each installation.5.1 Passwords to access the menusIt is possible to program a different password for the “Installation” menu and for the“Programming” menu.By default, the equipment is factory configured with the passwords disabled.Select the "ON" option and press the (Enter) key. The instrument will be ready for use.To return to the OFF mode, see point 6.7 on page 25.5 MAIN MENUTo access the main menu of the converter, press the (Enter) key. The following screen appears: