Vertiv | Liebert® CRV4 | User Manual 69
Micro-Controller (Text-screen)
Chapter 7: Micro-Controller (Text-screen)
This chapter provides a detailed description on feature, appearance, color screen, control buttons, control
interface and menu structure of the Liebert® CRV4 precision air conditioner. It also helps the user gain insight
of the inner workings of the product which include the information such as system setup, alarm menus and
basic maintenance.
7.1. 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. It comprises a 128x64 dot matrix LCD screen with white backlight and an easy-to-use interface.
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 and low voltage protection, phase
loss and protection against phase-reversal.
5. It accurately displays the running time of critical components through menu operation.
6. The expert-level fault diagnosis system can automatically display the current fault information to facilitate
technician personnel in maintenance activities.
7. It can store up to 1000 historical alarm records.
8. Congure the RS485 interface, using MODBUS-RTU communication protocol.
7.2. Appearance
The micro-processing controller panel is shown in Figure 7-1.
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