After an output is forced manually ON or OFF through the Override Output menu, it remains in that state
until returned to automatic control through this menu.
Table 7.19 below summarizes the four types of control, including the abbreviated message that appears
on the LCD and in log reports.
Message Description
AUTO Automatic
Controlled by Liebert AC8
(default for all outputs)
FORCE ON Manually ON
This output has been forced ON (operating) or OFF
via the Override Output menu
FORCE OFF Manually OFF
HW FORCE ON
Manually ON
(all outputs)
All outputs have been forced ON (operating) via
the hardware switch on the circuit board (see
Controller Board Overview on page4)
Table 7.19
Automatic / manual control - output points
To force an output point ON or OFF or return it to automatic control:
Log In and Choose Override Output
• From the Main Menu, use the arrows to choose System and
Control, then press Enter (see Login on page53 for help).
• Enter your password at the Login screen.
• From the System and Control Menu, use the arrows to choose
Override Output, then press Enter.
Select an Output
The Select Output menu, shown at right, displays the current status of all
eight outputs.
• Use the arrows to choose the output you want—for example,
Device_1—and press Enter.
Turn Output ON or OFF / Return to Automatic
• From the Override Output menu, use the arrows to choose one
of these options:
• AUTO - return to automatic control
• FORCE ON - manually turn this output ON (operating)
• FORCE OFF - manually turn this output OFF
• Press Enter.
Vertiv | Liebert® AC8 User Manual | 104
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