Honeywell S7999D1048 Manual page 41

Fig. 85. Fuel/Air Ratio Control Status.
The Fuel/Air Ratio Control faults history can be viewed by
selecting the "Show Faults" button (Fig. 86). This button has a
red color when the Fuel/Air Ratio Control is currently in a fault
condition. If audio alarm is enabled for fault conditions (see
"Setting up the S7999D display" on page 15), then an audio
alarm also sounds when the fault occurs. The audio alarm
continues to sound until either the fault is cleared (e.g., R7999
is reset), the fault history is viewed, the "OK" button is touched
in the Fault pop-up dialog box, or the "Alarm Bell" icon is
touched on the Home page.
Fig. 86. Fuel/Air Ratio Control—Fault History, left view.
NOTE: Timestamping Values are cleared after the
S7999D resets, or when switching to a different
burner system or from/to the local Fuel/Air Con-
trol.
S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY
Fig. 87. Fuel/Air Ratio Control—Fault History, right view.
Fuel/Air Ratio Control Configuration
Commission configuration selections and diagnostic
information about the Fuel/Air Ratio Control can be viewed by
selecting the "View Configuration" button on the Fuel/Air Ratio
Control page. A configuration page like the one in Fig. 88
displays to show this information.
Fig. 88. Fuel/Air Ratio Control Configuration.
Running Modulation Time is an accumulative time of how long
the Fuel/Air Ratio Control has been in a modulated state, i.e.,
when it has been controlling the actuators in an active run state
following a successful lightoff. This running time accumulates
over each cycle of the Fuel/Air Ratio Control and will stop when
the Fuel/Air Ratio Control is not in a modulate state.
The "Auxiliary Sensor" button displays configuration settings
made for the auxiliary sensor input to the Fuel/Air Ratio
Control. It also displays the current reading of the auxiliary
sensor. An Auxiliary Sensor must first be connected to the Fuel
Air Ratio controller to use this function.
The "Presets" button displays the actuator preset settings for
the currently selected fuel (Fig. 89). Presets are actuator
positions used for the three indicated states on the left side of
the screen.
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