System and Control Options

7.9Override Output

The Override Output feature allows you to manually change the state of any digital output to ON or OFF, overriding automatic control by the AC4 (the default setting for all outputs). This menu also allows you to release the manual override, returning any output to automatic control.

There are two ways to override automatic control of outputs:

•Use the Override Output menu, as described in this section, to turn any output ON or OFF.

•Use the hardware switch on the circuit board to force all four outputs ON at the same time (see Item F - Manual Override Switch (outputs) in 1.6 - Controller Board Overview).

After an output is forced manually ON or OFF, it remains in that state until returned to automatic control through this menu.

Table 20 summarizes the four types of control, including the abbreviated message that appears on the LCD and in log reports.

Table 20 Automatic / manual control - output points

Message

 

Description

 

 

 

AUTO

Automatic

Controlled by AC4

(default for all outputs)

 

 

FORCE ON

Manually ON

This output has been forced ON

 

 

(operating) or OFF via the Override

FORCE OFF

Manually OFF

Output menu

 

 

 

 

 

All outputs have been forced ON

 

Manually ON

(operating) via the hardware switch on

HW FORCE ON

the circuit board (see Item F - Manual

(all outputs)

 

Override Switch (outputs) in 1.6 -

 

 

 

 

Controller Board Overview)

 

 

 

To force an output point ON or OFF or return it to automatic control:

Log In and Choose Override Output

• From the Main Menu, use the arrows ↑↓ to choose System and Control, then press Enter ↵ (see 7.1 - Login for help).

• Enter your password at the Login screen.

• From the System and Control Menu, use the arrows ↑↓ to choose Override Output, then press Enter ↵ .

Select an Output

The Select Output menu, shown at right, displays the current status of all four outputs.

•Use the arrows ↑↓ to choose the output you want—for example, Device_1—and press Enter ↵ .

Turn Output ON or OFF / Return to Automatic

• From the Override Output menu, use the arrows ↑↓ to choose one of these options:

•AUTO - return to automatic control

•FORCE ON - manually turn this output ON (operating)

•FORCE OFF - manually turn this output OFF

•Press Enter ↵ .

Main Menu

VIEW STATUS

> SYSTEM AND CONTROL

↑↓ =NEXT

↵ =SELECT

Login

LOGIN

AAAA

↑↓ =SELECT ↵ =NEXT/END

System & Control Menu

SETUP SYSTEM

>OVERRIDE OUTPUT

CLEAR ALARMS & LOGS ↑↓ =NEXT ↵ =SELECT

Select Output

OVERRIDE OUTPUT

> DEVICE_1 AUTO DEVICE_2 AUTO ↑↓ =NEXT ↵ =SELECT

DEVICE_3 AUTO DEVICE_4 FORCE ON

Override Output

SELECT DEVICE_1

FORCE ON ↑↓ =SELECT ↵ =END

46

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Liebert AC4 user manual Override Output
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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.

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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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