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between 10 mA and 10.5 mA are interpreted as a value of 10
mA. The configured actuators remain at their corresponding
10 mA firing rate position until a new firing rate is accepted.
Increasing the hysteresis value may reduce the amount of
actuator dither/hunting and premature wear-out due to a noisy
environment or an intelligent firing rate controller continuously
attempting to satisfy a very precise setpoint.
Use the green LED buttons on the Hysteresis screen for large
changes to the hysteresis value (Fig. 77). Use the up/down
buttons on the bottom of the screen to slowly fine-tune the
desired hysteresis selection. Pressing the "Set Hysteresis"
button will cause the R7999 to reset and the new value will be
written into nonvolatile memory.
The user is asked to confirm setting the hysteresis to the new
value (Fig. 78). The "Reset to Current" button causes the
current value to be copied to the proposed new value field,
similar to an undo operation. See Fig. 77 and 78.
Fig. 77. Set Hysteresis.
Fig. 78. Confirm setting—Hysteresis.
Actuator
The status of each actuator can be viewed by clicking on the
icon on the Home page corresponding to that actuator. A
screen similar to that in Fig. 79 is displayed.
Fig. 79. Actuator status.
For Modbus™ burner systems, some of this information is not
available: Key, Stop Type, Close Direction, and State. This
information is blank on the screen in this case.
For actuators on the F/A Config port, the State status indicates
whether the actuator has been configured (key, stop type, and
close direction has been set) or not by displaying
"CONFIGURED" for its state. If the actuator has been
configured and also has its endpoints locked, the state
displays a "LOCKED" status.
Actuator fault history can be viewed by selecting the "Show
Faults" button (Fig. 80).
Fig. 80. Actuator fault history.
41
S7999B SYSTEM DISPLAY
65-0283—2
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