Liebert AC4 用户手册

The audible alarm sounds after the AC4 detects an alarm condition in any input that has been 

defined as alarmable. Once the alarm is silenced, there are two options:

• By default, the common alarm remains energized until all input alarms are cleared.
• You may change this setting to de-energize the common alarm automatically once the alarm is 

silenced.

You might want to reset the common alarm with silence if an external alarm—for example, a horn—is 

connected to the common alarm output contacts.
You might not want to reset the common alarm contacts (let contacts reflect/track alarms) and simply 

silence the audible horn.
To change the common alarm setting:

• 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 Setup System, then press 

Enter

↵

.

• From the Setup System Menu, shown at right, use the arrows

↑↓

 

to

 

choose Setup Common Alarm and press Enter

↵

.

• By default, the common alarm is set up not to reset automatically 

when the alarm is silenced (N). To change this setting, use the 

arrows

↑↓

 to

 

choose Y (Yes - reset with silence) or N (No - not 

reset), then press Enter

↵

.

SETUP INPUTS

SETUP ZONES

↑↓

=NEXT

↵

=SELECT

SETUP OUTPUTS
SETUP SYSTEM INFO
SETUP OPERATION 

RESET COMMON ALARM
WITH SILENCE? N

↑↓

=Y/N

↵

=END