Vertiv | Liebert® DM | User Manual 66
Microprocessor Controller
Chapter 5: Microprocessor Controller
This chapter gives a detailed description on feature, appearance, LCD screen, control buttons, control interface and menu
structure of Vertiv™ Liebert® DM Series.
5.1. Features
The micro-processing controller features as follows:
1. Adopt menu operation. It can monitor and display the operation status of precision cooling AC unit to keep the
environment within the setting range.
2. Adopt a 7-inch HMI color screen, the user interface, which is easy-to-use.
3. Provide 3-level password protection to prevent unauthorized operation eectively.
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. The running status and setting parameters of the part can be displayed in real time.
6. The graphical representation of return air temperature and humidity can be displayed in real time.
7. Accurately know the running time of important components through menu operation.
8. The expert-level fault diagnose system can automatically display the current fault information of the unit to facilitate easy
maintenance.
9. Store up to 999 PCS historical alarm records.
10. Configured with a serial RS485 communications protocol for monitoring purpose, it meets all securities norms.
5.2. Appearance
The micro-processing controller panel is shown in Figure 5-1.
Figure 5-1 Appearance of Color Screen
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