26 Chapter 5 Micro-Processing Controller
New Liebert_DM Series Air Conditioner User Manual
Chapter 5 Micro-Processing Controller
This chapter gives a detailed description on feature, appearance, LCD screen, control buttons, control interface and
menu structure of the Liebert_DM AC.
5.1 Feature
The micro-processing controller has the following features:
1. Adopt menu operation. It can monitor and display the operation status of precise cooling AC unit to keep the
environment within a setting range.
2. Adopt a 128 × 64 dot LCD screen with white backlight. The user interface is easy-to-use.
3. Provide three-level password protection to prevent unauthorized operation effectively.
4. Provide the functions, including self-recovery upon power failure, high-voltage & low-voltage protection, phase loss
protection and automatic phase-sequence switching upon anti-phase.
5. Accurately know the running time of important components through menu operation.
6. The expert-level fault diagnose system can automatically display the current fault information to facilitate
maintenance personnel in equipment maintenance.
7. Store up to 200 historical alarm records.
8. Configured with an RS485 port.
5.2 Appearance
The micro-processing controller panel is shown in Figure 5-1.
Figure 5-1 Micro-processing controller panel
5.3 LCD Screen
The LCD screen displays English menus with white backlight. When the system is operating normally, it displays the
current temperature & humidity (whether to display humidity is optional. Only the unit configured with a humidifier can
display humidity, see Select Options in 5.6.5 System Menu for details), unit output status (cooling, heating,
dehumidifying and humidifying), unit mode (single, lead, standby), unit operation status (running, standby, locked),
alarm information and current date & time, as shown in Figure 5-2.
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