S7999B SYSTEM DISPLAY
65-0283—2
40
The “Auxiliary Sensor” button displays configuration settings
made for the auxiliary sensor input to the Fuel/Air Ratio
Control (Fig. 73). It also displays the current reading of the
auxiliary sensor.
Fig. 73. Auxiliary sensor status.
The “Presets” button displays the actuator preset settings for
the currently selected fuel (Fig. 74). Presets are actuator
positions used for the three indicated states on the left side of
the screen.
Fig. 74. Fuel preset settings.
The “Diagnostics” button displays diagnostic information
about the Fuel/Air Ratio Control (Fig. 75). Current hysteresis
value can be viewed or changed by selecting the “Hysteresis”
button. See the Set Hysteresis section for more information
regarding this button selection.
Fig. 75. Fuel/Air Ratio Control diagnostics.
The “Show Faults” button displays the Fuel/Air Ratio Control
fault history (Fig. 76) in the same manner that it does on the
Fuel/Air Ratio Control status page. This button provides
another place to display these faults.
Fig. 76. Fuel/Air Ratio Control fault history.
Set Hysteresis
This feature is available for all ControLinks™ Fuel/Air Ratio
Control software builds except 127, 140 and 176 (see Home
page screen for build number). The Fuel/Air Ratio Control
must be updated to use this feature. This feature is also only
available for the Fuel/Air Ratio Control attached to the F/A
Config. port.
The hysteresis value controls the amount of hysteresis for the
4 to 20 mA firing rate (CmA) input signal. Adjusting the
hysteresis value determines when the R7999 reacts to a firing
rate change in the opposite direction. The R7999 only reacts
to a firing rate change in the opposite direction when it has
increased/decreased more than the user-selected hysteresis
value. However, the R7999 always follows the firing rate
signal as it changes in the same direction.
For example: When a hysteresis value of 0.5 mA has been
selected and the firing rate drops from 12 mA to 10 mA, the
R7999 will not begin to follow an increased firing rate until it
increases to a value of 10.5 mA or higher. All firing rate values
