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Change the contrast value with

/Up (higher contrast) and

/Down (lower contrast) keys.

The adjustment range is from approximately 70% to 100%.

The value 100 = a dark display.

The value 70 = a light display.

Note that a setting below approximately 70% will make it impossible to read the text. The

best contrast setting for the display is usually around 90% (default).

When the setting is OK press

and

/Exit. Unisab III will now be restarted with the new

settings.

The display contrast can be adjusted with the

keys to make the display lighter and the

keys to make the display darker. Hold down the

key while repeatedly press-

ing

to lighten or darken the display.

The Unisab III contrast setting system was originally set to a default value of 90. The contrast

value is stored in the controller memory. In some cases the user would like to increase the

contrast to a higher value than the maximum value of 100 so the contrast circuit was changed

leading to a new default value of 40.

The new contrast system was introduced with the revision F controller and revision F HMI. De-

fault values and combination of controllers and HMIs are shown in Table 1:

HMI Controller Before Rev. F From Rev. F

Before Rev. F 90 40

From Rev. F 90 40

The contrast range is between 0 (Light) and 100 (Dark).

If you experience a blank display after installation of a new software version or after replacing

the controller or HMI, proceed as follows:

Slowly adjust the contrast to a darker display, as described above, until you can see a picture.

If no picture appears in the display, the contrast may be set too high. Try to adjust the con-

trast slowly to a lighter display. Proceed until a picture appears in the display.

Unisab III (boot) and communication set-up

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Engineering manual - Unisab III 1.10

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Johnson Controls SABROE Unisab III Control User Manual

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