Fuel/Air Ratio Control Configuration; Fuel/Air Ratio Control—Fault History - Honeywell S7999B Manual

You can zoom in on the modulation curve by selecting the
magnifying glass icon in the lower left corner of the screen
(Fig. 69). Select the (-) magnifying glass icon to zoom out and
return back to the original status screen.
Fig. 69. Zoom in on the modulation curve.
The Fuel/Air Ratio Control faults history can be viewed by
selecting the "Show Faults" button (Fig. 70). 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
User's Preferences), 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) or the fault
history is viewed, or the Alarm Silence icon is pressed on the
Home page.
Fig. 70. Fuel/Air Ratio Control—fault history.
If timestamps are enabled (see User's Preferences), then the
time that the fault occurred is also displayed in the history
(Fig. 71).
NOTE: Timestamping Values are cleared after the S7999B
resets, or when switching to a different burner sys-
tem or from/to the local Fuel/Air Control.
Fig. 71. Fuel/Air Ratio Control—fault history with time.

Fuel/Air Ratio Control Configuration

Commission configuration selections and diagnostic
information about the Fuel/Air Ratio Control can be viewed by
selecting the "Fuel/Air Ratio Control Configuration" button on
the Home page. A configuration page like the one in Fig. 72
displays to show this information.
NOTE: Postpurge Time Out is available only for the local
Fuel/Air Control.
Fig. 72. 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.
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S7999B SYSTEM DISPLAY
65-0283—2