Set Control Accuracy - Honeywell S7999B Manual

S7999B SYSTEM DISPLAY
Diagnostic information about the actuator can be viewed by
selecting the "Diagnostics" button. Diagnostic data for all
actuators display at the same time to give a quick snapshot of
all actuator activity. The data can be displayed in degrees
(Fig. 81) or in analog-to-digital counts (Fig. 82).
Fig. 81. Actuator diagnostics—in degrees.
Fig. 82. Actuator diagnostics—in A/D counts.
The button on the bottom of the screen toggles the user
between the formats to display the data in.
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Set Control Accuracy

The "Control Accuracy" button, if enabled, allows the user to
view the current control accuracy setting and change it, if
desired.
This feature is only available for Fuel/Air Control software
builds higher than 178. The Fuel/Air Control must be updated
to use this feature. The "Control Accuracy" button on the
Actuator screen is grayed-out when the Fuel/Air Control
software build is 178 or below (see Fuel/Air Ratio Control
Configuration page for build number).
The control accuracy setting controls how closely the
actuators follow the profile curve configured in a Fuel/Air
Control and defines the allowable tolerance for achieving
each commanded position. The R7999 system normally
drives the actuators to within 0.1 degree (default value) of the
programmed curve, but many applications may not require
this type of accuracy. Increasing the control accuracy value
may reduce the amount of actuator dither/hunting and
premature wearout due to a noisy environment or a
potentiometer.
When the "Control Accuracy" button is selected, a new page
(Fig. 83) is displayed. Pressing the Set Accuracy button
causes the Fuel/Air Control to reset and store the user-
selected value in the Fuel/Air Control nonvolatile memory.
NOTE: Setting the control accuracy to a value other than 0.1
degree disables 0.1 degree positioning commands
available by default when commissioning the curve.
This setting applies to all actuators, not just the
actuator that has its status displayed.
Fig. 83. Set Control Accuracy.
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