Filter
Top Products
System and Control Options
35 Liebert
®
AC4
™
7.6.2 Define Operating or Standby Mode
Each output may be defined as Operating (OP), Standby (ST), or Not
Used (NU). This setting takes precedence over any setting in the
override menu (see 7.9 Override Output).
Default settings are:
• Outputs 1, 2 and 3 are in Operating (OP) mode
• Output 4 is in Standby (ST) mode
To change the mode:
• From the Setup Outputs Menu, shown at right, use the arrows
↑↓
to
choose Mode for the selected output and press Enter ↵.
• To change the output’s mode, use the arrows
↑↓ to choose one of
these options:
• OP (Operating)
• ST (Standby)
• NU (Not Used)
• Press Enter ↵.
7.6.3 Enable or Disable an Output Device in Alarm Status
You may choose whether to Enable or Disable an output when the
connected device is in alarm status. The default setting for all output
points is Enabled.
• From the Setup Outputs Menu, choose In Alarm, as shown at
right, and press Enter ↵.
• To make a change, use the arrows
↑↓ to choose E (Enable) or
D (Disable) to determine what happens when an alarm is detected
in the device.
• Press Enter ↵.
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 7.6.1 Define Output as Normally Open or Normally
Closed.
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 3.2.3 Setting the Digital Output Jumpers.
Setup Outputs Menu
SETUP DEVICE_1
NORM OPEN/CLOSE: NO
> MODE: OPERATING
↑↓=NEXT ↵=SELECT
IN ALARM: ENABLE
Set Mode
SET MODE: OP
↑↓=OP/ST/NU ↵=EDIT
Setup Outputs Menu
SETUP DEVICE_1
NORM OPEN/CLOSE: NO
MODE: OPERATING
↑↓=NEXT ↵=SELECT
> IN ALARM: ENABLE
Change State in Alarm
STATE OF DEVICE
IN ALARM: DISABLE
↑↓=E/D ↵=EDIT