Liebert AC4 - Manual (Page 40)

System and Control Options
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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 over-
ride 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 con-
nected 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 Nor-
mally 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