Introduction

Table 1

Controller board components (continued)

 

 

 

 

 

 

Item

Description

 

For more information, see:

 

 

 

 

 

 

 

One of four output jumpers. Each digital output has a

 

 

 

 

jumper to set the fail-safeposition of the output point when

3.2.3: Setting the Digital Output

I - Digital output

power fails. The OFF position makes the contact Normally

 

Jumpers

loss-of-power

Open (factory default). The ON position makes the contact

 

7.6.4: Configure Output for Loss of

jumper

 

Normally Closed.

 

 

Power (“Fail-Safe”)

 

 

Note: The jumper position has no effect on the contact

 

 

 

 

 

 

 

when the AC4 has power.

 

 

 

 

 

 

 

 

 

Each of the four input connections is a two-state point: ON/

3.0:

Wiring and Connections

J - Digital input

OFF (energized/de-energized).

3.2.1: Connecting Digital Inputs

connectors

An example of a field digital input is a Liebert

5.4:

View Input Status

 

 

Environmental unit’s common alarm relay output.

7.3:

Setup System - Setup Inputs

 

 

 

 

K - Digital input

Each input has an LED to indicate its status: ON/OFF

1.7:

LED Indicators

status LEDs

(energized/de-energized).

 

 

L - Serial interface

Connection for laptop or video terminal. Used for

3.4:

RS232 Connector

configuration and monitoring using the Service Terminal

connector (RS232/

A.2:

Connecting to the Service

Interface. Requires a null modem cable for connectivity

EIA574)

 

 

Terminal Interface

 

(P/N 201258P1).

 

 

 

 

 

 

 

 

M - DIP switch 1

DIP switch used for resetting password to default.

7.7.1: Change Password

 

 

 

 

N - LCD connector

Connection for the LCD on the enclosure door.

N/A

 

 

 

 

 

O - LCD contrast

Adjustment contrast for the LCD on the enclosure door.

N/A

 

adjustment

 

 

 

 

 

 

P - 24VAC power

Power connection for the controller. Requires 24VAC.

2.4:

Connect Power to the AC4

connector

 

 

 

 

 

5

Page 11
Image 11
Liebert AC4 Description For more information, see, Connector RS232, EIA574, DIP switch, LCD connector, LCD contrast

AC4 specifications

The Liebert AC4 is a highly advanced cooling solution designed for critical environments, such as data centers and telecommunications facilities. As data demands rise and IT equipment generates significant heat, an effective cooling system is paramount to maintaining optimal performance and reliability. The Liebert AC4 stands out in this space, offering a blend of efficiency, flexibility, and innovative technology.

One of the main features of the Liebert AC4 is its adaptability to various configurations and applications. It can be deployed in both hot aisle and cold aisle containment setups, making it versatile for different data center designs. This flexibility allows facilities to implement cooling strategies that align perfectly with their specific layouts and operational requirements.

The Liebert AC4 employs cutting-edge, variable-speed fans that enhance energy efficiency. These fans adjust their speed according to the cooling load, ensuring that the system operates at peak efficiency while significantly reducing energy consumption. This feature is essential in critical environments, where minimizing operational costs is often as important as maintaining optimal temperatures.

In addition to energy-efficient cooling, the Liebert AC4 integrates advanced monitoring and control technologies. With built-in intelligence and compatibility with the Liebert SiteScan monitoring system, users can ensure real-time visibility into their cooling operations. This monitoring capability enables data center managers to make informed decisions and swiftly address any cooling anomalies, minimizing the risk of overheating and downtime.

Furthermore, the system is designed to be easy to install and maintain, reducing downtime during setup and upkeep. The modular design allows for scalability, enabling organizations to expand their cooling capabilities as their needs grow.

The Liebert AC4 also features a robust construction that enhances reliability and durability, making it an ideal choice for environments where equipment uptime is critical. Its streamlined design not only optimizes airflow and cooling distribution but also contributes to aesthetic considerations in professional settings.

In conclusion, the Liebert AC4 combines efficiency, versatility, and advanced technologies to deliver a reliable cooling solution for modern data centers and critical facilities. Its variable-speed fans, flexible configurations, and advanced monitoring capabilities position it as a leader in the competitive field of cooling solutions, ensuring that critical equipment remains operational and efficient. Organizations looking to enhance their cooling strategies will find the Liebert AC4 to be an invaluable asset in today’s fast-paced digital landscape.