7.6.4 Configure Output for Loss of Power (“Fail-Safe”)
Each output has an associated jumper that can help prevent undesired effects when the controller board
loses power. For example, without the proper fail-safe jumper setting, a loss of power might close a switch
that is Normally Open (NO)—perhaps shutting off an environmental unit or a fan or closing a valve.
This fail-safe jumper setting is unrelated to configuring an output as Normally Open (NO) or Normally
Closed (NC), as described in Define Output as Normally Open or Normally Closed on the previous page.
To configure a digital output jumper for a loss of power:
• Set the jumper in the “OFF” position (factory default) to make the output Normally Open(NO).
• Set the jumper in the “ON” position to make the output Normally Closed(NC).
For more information, see Setting the Digital Output Jumpers on page23.
7.7 Setup System - Setup System Info
The Setup System Info options allow users to:
• Change Password—used for access to system setup functions
• Set Date & Time/Automatic Daylight Saving Time—used to set the Liebert AC4 date and time
and to enable automatic time change for Daylight Saving Time
• Setup Site ID—the Liebert AC4’s location to differentiate among sites if more than one Liebert
AC4 is in use
• Backup and Upload Configuration File (Service Terminal Interface only)—permits the user to
copy the Liebert AC4’s configuration settings and to upload the file to the Liebert AC4
• Factory Defaults—returns the Liebert AC4 to its factory settings
• Perform Firmware Update (Service Terminal Interface only)—changes the Liebert AC4’s
firmware to newest version
To change any Setup System Info features:
Log In and Choose Setup System
• From the Main Menu, use the arrows to choose System and
Control, then press Enter (see Login on page41 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.
Select Setup System Info
• From the Setup System Menu, shown at right, use the arrows to
choose Setup System Info and press Enter.
• Use the following steps to access any of the Setup System Info options.
Vertiv | Liebert® AC4 User Manual | 52
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