Vertiv | Liebert® CRV4 | User Manual 51
Micro-Controller (Color Screen)
Chapter 6: Micro-Controller (Color Screen)
This section introduces the controller features, control screen details, basic system maintenance, and routine
troubleshooting which enables the customer to understand the functioning of the unit. It helps user gain insight
into the inner workings of the product comprising the information such as System setup, Alarm menus, and
Basic operations of the controller interface.
6.1. Features
Following are the features of the micro-controller:
1. The micro-controller is used for monitoring and displaying the operation status of the Liebert® CRV4 unit to
keep the environment within a setting range.
2. The Liebert CRV4 air conditioning is congured with 7-inch HMI color screen, which makes user interface
operation simple.
3. It provides a three-level password protection to eectively prevent unauthorized operation.
4. It provides the functions, including self-recovery upon power failure, high voltage and low voltage protection,
phase loss and anti-phase protection.
5. User can accurately understand the main parameters and operating status of the system through menu
operation.
6. Real time display of measured Temp & Hum curves.
7. It accurately displays the running time of critical components through menu operation.
8. The expert-level fault diagnosis system can automatically display the current fault information to facilitate
maintenance personnel in servicing and repair.
9. It can store up to 1000 historical alarm records.
6.2. Appearance
The unit has a 7-inch HMI color display and its appearance is shown in Figure 6-1
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