Vertiv | Liebert® DM | User Manual 67
Microprocessor Controller
There are 4 types of indicators in the lower right corner of the color screen. The color and function descriptions of each case
are as follows according to Table 5-1.
Table 5-1 Indicator Function Table
Indicator Function Description
Blue The screen is starting.
Yellow The screen fails to communicate on the control panel or the system is shut down.
Green The system is running normally.
Red The system has an alarm and the buzzer sounds.
5.3. Control Interface
5.3.1. Color Screen Main Interface
After the start-up is completed, enter the main interface. The top part of the color screen displays the menu, first page, time,
date and unlock button options. User cannot enter the menus as the menu option is locked. Click the unlock button and
enter the correct password. The top part of the screen will display temperature / humidity setting option, graph option and
On/O option as shown in Figure 5-2. User can switch On/O by pressing the On/O button for at least 3 seconds.
As shown in the left half of Figure 5-2, the text on the left side of the arc indicates the humidity control mode (default is
return air humidity control), and the text on the right arc indicates the temperature control mode (default is return air
temperature control). The temperature value in the circle indicates the measured value of the return air temperature and
humidity. Two triangles on the circumference of the circle - the left side indicates the return air humidity setpoint and the
right side indicates the return air temperature set point. Click toggle button 1 to switch between graphics and list display.
Click the Settings button to enter the temperature and humidity settings interface to set the temperature and humidity.
As shown in the right half of Figure 5-2, the sensor data or alarm data is displayed. Click the toggle button 2 to switch
between the sensor data and the alarm data.
The unit provides the alarm self-diagnosis function. Click the alarm data to display the possible causes and treatment
measures of the listed alarms.
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