System and Control Options

7.8.1Turn Automatic Sequencing On or Off

Use automatic sequencing to set up a schedule for rotation of redundant devices. For example, three devices might be in operating mode while a fourth device is in standby mode. Every two days, the AC4 returns the standby device to operating mode and places one of the operating devices on standby.

When zones are used, the AC4 manages the rotation sequence for each zone separately, so each zone might have one device in operating mode and one in standby mode.

Auto sequencing is OFF (deactivated) by default. When auto sequencing is activated (ON or 12h, for a

12-hour interval), the AC4 cycles devices at the specified interval and time of day as follows:

•An output device in Standby mode is returned to Operating mode.

•An output device that is Operating is put in Standby mode.

When more than one device is in Standby mode or turned On, the AC4 performs the operations in a sequence that rotates the order. For example, in a sequence set up to occur every two days:

• Monday:

Device 1 is placed on Standby, and Devices 2, 3 and 4 operate.

• Wednesday:

Device 2 is placed on Standby, and Devices 1, 3 and 4 operate.

• Friday:

Device 3 is placed on Standby, and Devices 1, 2 and 4 operate.

• Sunday:

Device 4 is placed on Standby, and Devices 1, 2 and 3 operate.

NOTE

The AC4 will not cycle outputs that have been manually forced On or Off through the Override Output Menu or the hardware switch (see 7.9 - Override Output).

To change the auto sequencing settings:

1.

From the Setup System Operation Menu, use the arrows ↑↓ to

 

choose Auto Sequencing, then press Enter ↵ .

2.

In the Activate / Deactivate screen, use the arrows ↑↓ to choose one

 

of three options:

a.ON for intervals of every 1 to 99 days, then press Enter ↵ and proceed to Step 3.

b.12h for an interval of every 12 hours, then press Enter ↵ and proceed to Step 4.

c.OFF to deactivate auto sequencing, then press Enter ↵ to return to the previous menu.

3.Select the interval for how often the sequencing should occur in the Every 03 Days field. The default is 3 days; valid entries range from 0 to 99 days.

• For each digit, use the arrows ↑↓ to choose a number from 0 to 9, then press Enter ↵ to advance to the next digit.

•When finished, press Enter ↵ to set the time of day.

4.Specify the time of day the sequencing should begin in the At 00:00 field. The format is HH:MM for hours and minutes.

•Use the arrows ↑↓ to choose from available entries for hours (00-23), then press Enter ↵ to advance to minutes.

•Use the arrows ↑↓ to select minutes (00-59).

•When finished, press Enter ↵ again.

Setup Operation Menu

> AUTO SEQUENCING OFF

STANDBY TESTING OFF FAILED STANDBY N ↑↓ =NEXT ↵ =SELECT

HOLD DELAY

:

10:00

RESTART

:

00:06

Activate / Deactivate

> AUTO SEQUENCING OFF

↑↓ =NEXT ↵ =EDIT

Set Interval & Start Time (1- to 99-Day Interval)

>AUTO SEQUENCING ON EVERY 03 DAYS

AT 00:00

↑↓ =NEXT ↵ =EDIT

Set Start Time

(12-Hour Interval)

> AUTO SEQUENCING 12h

AT 00:00

↵ =EDIT

↑↓ =NEXT

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Liebert AC4 Turn Automatic Sequencing On or Off, Activate / Deactivate, Set Interval & Start Time 1- to 99-Day Interval
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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.
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