Delta OHM HD45 Series Manual page 27

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Use the " " and " " keys to increment or decrement the value.
Confirm by pressing the MENU key, the cursor disappears.
At this point, you can scroll again through the parameter list with the arrow keys.
Changing the protection level
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When the full cursor flashes on the parameter value, press again the " " or " " keys
to move the full flashing cursor on the level value.
Press the MENU key, the cursor will move to the "underlined" mode.
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