VMD421H-D-3 BENDER

After connecting the device for the first time, the nominal system voltage will be determined (PrE run), and the response values for overvoltage and undervoltage as well as for 

underfrequency and overfrequency will automatically be set. When no voltage is determined within a nominal system voltage range (PrE run), the response values will be set to 

the minimum or maximum voltage. In this case, the message “AL not SET” appears on the 

display. As long as no button is pressed, a nominal system voltage is being searched cyclically 

(PrE run). If a button is pressed, the search will be interrupted and the message “AL not SET” 

disappears. In this case, the appropriate response values have to be set in the menu. 

When activating the frequency monitoring function, the preset frequency will automatically 

be stored.

Description:

1 - Power On LED “ON” (green); lights when supply voltage is applied 

and flashes in the event of system fault alarm

2 - Alarm LED “AL1” (yellow), lights when the set response value 

>U/<f/>f is exceeded and flashes in the event of system fault 

alarm

3 - Alarm LED “AL2” (yellow), lights when the value falls below 

the set response vlaue <U/<f/>f and flashes in the event of 

system fault alarm

4 - Multi-functional LC display

5 - Test button “T”:

Arrow up button: To change the measured value display, 

move upwards in the menu or to change parameters.

 To call up the self test: press the button “T” >1.5 s

6 - Reset button “R”:

Arrow down button: to change the measured value indication, 

move downwards in the menu or to change parameters

 To delete stored alarms: press the button “T” >1.5 s

7 - “MENU” button:

Enter button: to confirm the measured value indication or to 

confirm changed parameters

 To call up the menu system, press the button “T” >1.5 s

 Press the ESC button >1.5 s to abort an action or to return to 

the previous menu level

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