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Microprocessor Control
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4.0 MICROPROCESSOR CONTROL
4.1 Feature Overview
The microprocessor control for the Liebert XDP features an easy-to-use menu-driven LCD. The
menus, control features and circuit board details are described in this section.
Figure 22 User interface
Active alarms are displayed on the LCD screen and sound an audible beep. To silence an alarm, press
the Alarm Silence/Help key as prompted on the display.
Setpoints, DIP switch settings and other selections were made during factory testing of the unit based
on typical operating conditions. (Other default selections were made according to options included
with the unit.)
ADJUST THE FACTORY DEFAULTS ONLY IF THEY DO NOT MEET YOUR SPECIFICATIONS.
Allowable ranges are displayed by pressing the Help key. A password will be required (if enabled) to
change setpoints, time delays, etc.
The display normally shows the leaving refrigerant temperature on the first line and alternates
between the dew point and the number of alarms present on the second line.
4.1.1 Display
To turn the unit On, press the On/Off (I/O) key after power is applied to the Liebert XDP.
To turn the unit Off, press the On/Off (I/O) key before power is disconnected.
Table 12 User interface keypad functions
Keypad Function
On/Off (I/O) Turns the unit On or Off (top far left keypad)
Menu Enables the user to access the program menu to change setpoints, alarms, etc. (top near left)
Up Arrow Key
Raises the value of displayed parameter while in a set mode (set points, time, etc).(arrow, top
near right)
Escape (Esc) Allows user to move back to a previous menu (top far right)
Alarm Silence
If an alarm is present, press this key to silence the alarm. Help text will appear if this key is
pressed when no alarm is present (bottom left)
Down Arrow
Key
Lowers the value of displayed parameter while in a set mode (set points, time, etc).(arrow,
bottom near right).
Enter
After setting a control value, press ENTER to store the information in the microprocessor
(bottom right).
Up Arrow Key
Status Display
On/Off Key
Alarm Silence Key
Down Arrow Key