Adjusting The Lcd Screen Contrast; Figure 45: Contrast Setting - ABB 266 MODBUS User Manual

Adjusting the LCD screen contrast

It may be necessary to adjust the contrast on the HMI display screen. If the screen is blank, go to section 6.2, Blank display
screen, to troubleshoot the issue. If the screen text is dim or the contrast is too high, the following procedure allows the user to
view the setting and make an adjustment if necessary. The LCD screen contrast should be set between 0 and 100, with the
highest possible contrast being 100.
WARNING – Bodily injury. When the housing covers are removed and power is still connected, there is a
potential for explosion. Failure to observe this safety information may result in death or severe injury.
Do not remove housing covers in hazardous (classified) areas or explosive environments unless the area is
known to be non-hazardous. Verify an explosive atmosphere is not present before removing the housing covers
and power is live.
This procedure requires the transmitter to remain powered up.
1. Do not disconnect power. This procedure requires the transmitter to remain powered up.
2. Use the instructions in section 5.2.1, Removing the housing cover, to remove the front housing cover, exposing the interior.
3. Press the right soft key and the left soft key simultaneously. This will reset the contrast to a default value of 50. If this
contrast setting works for this site, no further adjustments are needed. If further adjustments are needed, continue to the
next step.
4. Press the right soft key to access the main Menu on the HMI.
5. Use the key pad to locate and select Display > Contrast.
6. Verify that the contrast setting is set to a value of 50 (Figure 45). If the value is near 0 or 100, adjust the contrast that best
works for the site:
a. Select Edit to edit the new contrast value number.
IMPORTANT NOTES: The contrast field is defined as 6 digits, xxx.xxx. The Edit screen will open with the first
digit flashing and ready to be changed. If the contrast value is set to 100.000, it will be necessary to set the first
digit to 0 and then move to the second digit and so on. If the contrast value is a number less than 100.000,
press the left soft key (for Next) to move to the second digit.
Adjusting the screen contrast lightens or darkens the screen backlight, not the text. Decreasing the contrast
value lightens the screen backlight, which has the appearance of darkening the text. Increasing the contrast
value darkens the screen backlight, which has the appearance of lightening the text.
i. To enter a value, use the up or down arrow to locate the new value of the first digit. When selected, press the
left soft key for Next. This moves the cursor to the next digit.
Repeat this process for each digit until the entire new value is reflected on the screen. To change a digit's value
ii.
after moving past it, select the Next key until the cursor circles back to the incorrect digit then change it.
b. When the screen contrast is to a value that best works for the site, select OK.
7. Replace the front housing cover over the LCD assembly and secure the housing cover (go to section 5.2.2, Securing the
housing cover).
56 | 266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB

Figure 45: Contrast setting

5 Service and maintenance