* Turn the backlight on by pressing an arrow button on the HMI. If the HMI panelis not used for approximately five minutes, the backlight is turned offautomatically.* Activating the power-saving built-in feature by pressing turns the backlightoff within 20 seconds.4.1.3.4. How to adjust the display contrastThe display contrast is dependent on the temperature. The relay automaticallyadjusts the contrast for optimum readability. When the display is in the idle mode,you can also adjust the contrast manually.* To increase the contrast, hold down and adjust the contrast using .* To decrease the contrast, hold down and adjust the contrast using .After power start up of the relay, the factory default value of the display contrast isautomatically restored.4.1.4. Main menuThe main menu contains six main groups:* OPERATION* MEASUREMENTS* RECORDED DATA* SETTINGS* CONFIGURATION* INFO* *#!* *#!A040228Fig. 4.1.4.-1 Display showing the first main menu group* Navigate between the main menu groups by using and .* Return the display to the idle mode by pressing .The display is returned to the idle mode on expiration of the time out.4.1.5. SubmenuThe menu structure contains several subgroups. The name of the main menu groupis always shown on the first line. The second line displays either the name of thegroup menu, the name of the parameter and the parameter value, or just theparameter value, in which case it is also the name of the parameter.18REU 610REU 610 Voltage Protection RelayOperator's Manual1MRS755770