Siemens LMV 5 Series, Технические инструкции, Страница: 182 / 374

Technical Instructions LMV Series
Document No. LV5 ‐ 1000
Section 6 Page 10 SCC Inc.
NOTE: The %O
2
values read and displayed by the LMV52 system are always on a wet basis (%O
2
wet). Most if not all external exhaust gas analyzers read and display %O
2
and other gases on a dry
basis (%O
2
dry). All O
2
curves must be commissioned using %O
2
wet values as read by the LMV52.
The external exhaust gas analyzer is used to read CO, NOx, and also serves as a way to double
check the %O
2
wet values. Figure 6 ‐ 11 gives the approximate relationship between %O
2
wet and
%O
2
dry.
4. Make sure that the QGO20 O
2
sensor has been activated for at least 2 hours and is up to
temperature. This gives the Zirconium cell time to heat ‐ soak and also to burn off any contaminants.
The temperature of the cell can be checked if desired through the following menu path:
Params & Display > O2 Module > Process Data > QGO SensorTemp
5. With the burner off (Phase 12), set the fuel rich limit ( O2 Alarm value) for each point. This can be
done with the burner off since these values have already been found and recorded during Ratio
Control Curve commissioning (see above). Once into the O2 Alarm curve, simply enter in the
recorded value for each point and save each point. To access the O2 Alarm curve, use the following
menu path:
Params & Display > O2 Contr/Alarm > Gas Settings > O2 Alarm > O2 Alarm
6. With the burner off (Phase 12), set the fuel lean limit ( O2 MaxValue ) based on the values that have
already been found and recorded for Point 1 and Point 10 during Ratio Control Curve commissioning
(see above). To set the fuel lean limit, use the following menu path:
Params & Display > O2 Contr/Alarm > Gas Settings > O2 Alarm > O2 MaxValue
7. If the LMVx Curves spreadsheet is not being used, take the recorded O
2
Alarm values and add 0.5%
for each point. Take the "saved" %O
2
from the Ratio Control Curve and subtract 1.0% for each point.
This will provide a target band for setting the O
2
Control Curve points. Example: The O
2
Alarm value
is 2%. The Ratio Control Curve point "saved" is 4%. Add 0.5% to the O
2
Alarm = 2.5%. Subtract 1%
from the Ratio Control = 3%. For this point, the target for the O
2
Control is between 2.5% and 3%.
8. When it is safe to do so and when there is adequate load available, start the burner / boiler and let it
warm up to operating temperature.
9. Access the O
2
Ratio Control Curve and the O
2
Control Curve using the following menu path:
Params & Display > O2 Contr/Alarm > Gas Settings > O2 Control
10. Once the O
2
Control Curve is entered, Point 2 should be displayed. Pressing Enter again should drive
the burner to Point 2 if it is not already there. When the burner is driving to Point 2, a carat (>) will
be displayed. Once the burner is at Point 2, a colon (:) will be displayed. If the aux 3 actuator is used
for FGR and FGR ‐ Mode is not set for “Aux3onCurve”, a pound (#) indicates the aux 3 actuator has
not released to the curve.
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