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How to Adjust the LCD contrast in P3U10, P3U20 and P3U30
Prerequisite: You have entered the correct password.
1. Press and adjust the contrast.
• To increase the contrast, press "UP" arrow
• To decrease the contrast, press "Down" arrow.
2. To return to the main menu, press "Home" button.
NOTE: By nature, the LCD display changes its contrast depending on the
ambient temperature. The display may become dark or unreadable
at low temperatures. However, this condition does not affect the
proper operation of the protection or other functions.

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