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Using adjust ratio mode to modify and existing oxygen profile manually, follow steps 1 -12
listed below.
To adjust an oxygen set point or enter an air flow value in the firing range, use the following procedure.
The manual calculation of the values to be entered here is covered in the next section.
1.
Enter adjust ratio mode (See section 5.6).
2.
Ensure oxygen trim is set to monitor only 30.5 = 0.
3.
Use the scroll keys to select the desired set point and move up and/or down (A4 for
example). The system will modulate to the selected set point and the number displayed will
flash to indicate that the drives are modulating.
4.
Wait for the number in the display to be illuminated steadily. This means that the drives have
arrived at the selected set point.
5.
The display will allow scrolling sideways to show flow and ‘O2’ in addition to the servo-motor
positions to indicate that the system is expecting a flow value and an oxygen set point to be
entered for the current profile set point.
To check the current oxygen measured value use
the engineer’s key EK44.
6.
Once the oxygen value is shown on the display use the scroll keys to position the ‘>’ pointing
to the ‘O2’ value use the UP/DOWN keys to adjust the oxygen setpoint as necessary. The
display will start flashing to indicate that a change has been made.
7.
If the new oxygen set point value is wanted, press the ENTER key. The value will be stored in
memory.
8.
If the new oxygen set point value is not wanted or an adjustment is not required, press the
NEXT
key to return to the value stored in memory.
9.
Once the flow value is shown on the display use the scroll keys to position the’>’ pointing to
the ‘FLO’ value use the UP/DOWN keys to adjust the flow value as necessary. The display
will show the air flow value, represented as a percentage of the air flow when the drives are
at the
HIGH FIRE
position. The display will start flashing to indicate that a change has been
made.
10.
If the new flow value is not wanted or an adjustment is not required, press the
NEXT
key to
return to the value stored in memory.
11.
If it is necessary to adjust another set point in the firing range, repeat the above procedure
from step 3.
CAUTION
When using the adjust ratio mode, it is not possible for the unit to check drive
positions at all times. It is the responsibility of the engineer to check that motors
and valves are responding correctly.
Summary of Contents for NEXUS NX6100 series
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