Table 32 Automatic / Manual Control - Output Points; Override Output - Emerson Autochangeover Controllers AC8 User Manual

7.12

Override Output

The Override Output feature allows you to manually change the state of any digital output to ON or
OFF, overriding automatic control by the AC8 (the default setting for all outputs). This menu also
allows you to release the manual override, returning any output to automatic control.
There are two ways to override automatic control of outputs:
• Use the Override Output menu, as described in this section, to turn any output ON or OFF.
• Use the hardware switch on the AC8 circuit board to force all eight outputs ON at the same time
(see Item I - Manual Override Switch (outputs) in 1.7 - Controller Board Overview).
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 32 summarizes the four types of control, including the abbreviated message that appears on
the LCD and in log reports.
Table 32 Automatic / manual control - output points
Message
AUTO
FORCE ON
FORCE OFF
HW FORCE ON
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
Control, then press Enter
• Enter your password at the Login screen.
• From the System and Control Menu, use the arrows
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
Device_1—and press Enter .
Turn Output ON or OFF / Return to Automatic
• From the Override Output menu, use the arrows
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 .
Description
Controlled by AC8
Automatic
(default for all outputs)
Manually ON This output has been forced ON
(operating) or OFF via the Override
Manually OFF
Output menu
All outputs have been forced ON
(operating) via the hardware switch on
Manually ON
the circuit board (see Item I - Manual
(all outputs)
Override Switch (outputs) in 1.7 -
Controller Board Overview)
(see 7.1 - Login for help)
to choose the output you want—for example,
to choose System and
to choose
to choose one
75
System and Control Options
Main Menu
VIEW STATUS
> SYSTEM AND CONTROL
=NEXT =SELECT
Login
LOGIN
AAAA
=SELECT =NEXT/END
System & Control Menu
SETUP SYSTEM
> OVERRIDE OUTPUT
CLEAR ALARMS & LOGS
=NEXT =SELECT
Select Output
OVERRIDE OUTPUT
> DEVICE_1 AUTO
DEVICE_2 AUTO
=NEXT =SELECT
DEVICE_3 AUTO
DEVICE_4 FORCE ON
Override Output
SELECT DEVICE_1
FORCE ON
=SELECT =END