Introduction

1.8Typical Sequence

Figure 4 shows a typical sequence of how the AC4 functions after detecting a change in a monitored device. Many responses depend on configuration settings. This example shows what happens when a digital input changes state—assuming the input is defined as alarmable—and when the condition returns to normal.

Figure 4 Example of typical sequence

RESPONSES TO AN ALARM

RETURN-TO-NORMAL SEQUENCE

ALARM CONDITION DETECTED A device connected to the AC4 changes state.

The horn sounds (audible horn on the controller board—silence horn by pressing any key on the LCD keypad)

The LCD flashes

ESC

(except during setup)

ESC

RETURN TO NORMAL

The device that triggered the alarm returns to its normal state.

The alarm is cleared (automatically if Unlatched; must be cleared manually if Latched)

The horn stops sounding

(if user hasn’t silenced it)

The LCD stops flashing

DEVICE_1 ALARM

CONTACT CLOSED

30-SEP-04 16:23:04

DEVICE_1 ALARM

CONTACT CLOSED

DEVICE_4 STARTED

30-SEP-04 16:23:10

User setup determines output control (for example, the device in alarm might be disabled and a standby device set to operate)

Entry in Alarm Log

Condition (ALARM)

&state (CONTACT CLOSED)

Entry in Active Alarm Log

Condition (ALARM)

&state (CONTACT CLOSED)

Entry in Event Log

Status change

(DEVICE_4 STARTED)

ALARMS CLEARED

30-SEP-04 16:24:04

DEVICE_1 STARTED DEVICE_2 STARTED DEVICE_3 STARTED DEVICE_4 OFF

30-SEP-04 16:24:06

Entry in Alarm Log

(ALARMS CLEARED)

Entry in Event Log Actions in response to event

(DEVICE_1 STARTED, DEVICE_4 OFF)

7

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Liebert AC4 user manual Typical Sequence

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.