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Protect PV.500_MH Operating Instructions 
80000043212 BAL 
61 of 68 
Additional submenus are displayed on the left-hand side. All se-
lectable submenus are displayed in a frame. A black background 
indicates the current cursor position. The bottom line displays the 
current real time, which can be adjusted using the "Settings" 
On the right-hand side, the current key function is represented as a 
symbol which is displayed in a small framed area. You can move 
the cursor using the "<" and ">" keys to select the corresponding 
submenu. Use the ENTER key to activate a selected submenu. 
Using the "?" key, you can call up the "Help" menu, which de-
scribes all the various keyboard symbols. 
8.3.3 Operating 
You can call up the "Operating display" from the main menu. If the 
DOU has not been used for some time, the system automatically 
switches back to the operating display, no matter which menu it is 
The LCD background illumination is switched off if no further oper-
ations are carried out and the system is not in an abnormal status. 
In the event of a unit fault, the background illumination remains 
switched on until the fault is acknowledged.  If the inverter is in 
night mode, the content of the LCD is cleared and "Sleep mode" is 
displayed instead. The background illumination is also switched 
You can reactivate the DOU by pressing any key. 
Figure 27 
Operating display – Normal operation  
The "Operating display" consists of 3 parts: 
The left-hand side shows the current global unit status:  
Figure 28 
Operating display – Left-hand side