7.8 Setup Operation
The Liebert AC4 operation features allow you to set up a rotation sequence to alternate which devices are
operating and which are placed on Standby, as well as test devices while in Standby mode and specify
what to do when a Standby device goes into alarm as it is powered up. You may also specify delay times
after an output changes state, directing the Liebert AC4 to wait before
acknowledging inputs or turning an output on or off.
To change any operation 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 Operation
• From the Setup System Menu, shown at right, use the arrows to
choose Setup Operation and press Enter.
• Use the steps following Table 7.7 below to access any of the Setup Operation options.
Table 7.7 below shows the default settings for operation options: automatic sequencing, standby testing,
failed standby, hold delay and restart.
Feature Default Other Options
AUTO SEQUENCING OFF (Deactivated) ON (Activated), 12h (Activated for 12-hour intervals)
STANDBY TESTING OFF (Deactivated) ON (Activated)
FAILED STANDBY N (Deactivated) Y (Activated)
HOLD DELAY 10:00 (No delay) Any time (in minutes and seconds) from 00:00 to 99:59
RESTART 00:06 (No delay) Any time (in minutes andseconds) from 00:00 to 99:59
Table 7.7
Default settings - operation features
7.8.1 Turn 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 Liebert
AC4 returns the standby device to operating mode and places one of the operating devices on standby.
When zones are used, the Liebert 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 Liebert 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.
Vertiv | Liebert® AC4 User Manual | 60
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