Siemens LMV 5 Series, Technical Instructions, Page: 138 / 374

Technical Instructions LMV Series
Document No. LV5 ‐ 1000
Section 4 Page 20 SCC Inc.
NOTE: When in a curve point on the right ‐ hand side of the AZL screen, pressing “Esc” will
bring the cursor back to the left, off of the numbers. Pressing “Esc” again while off of the
numbers will bring up a prompt to ask if the point is to be stored (press “Enter”) or the
changes canceled (press “Esc”). If store is selected, a bar will rotate on the left ‐ hand side of
the AZL5 display while the point is being stored.
NOTE: When putting in a new point that is not yet defined (XXXX shown for the positions and
load), pressing “Enter” will put in values for the positions and load from the previous point
based on load number. These values serve as a place to start for the new point.
9. With the Ratio Control Curves laid out on paper or with the spreadsheet, begin setting the curve
points from low fire (Point 1) to high fire (Point 10). The general procedure for each point is to
match the load number to the fuel flow while maintaining safe combustion. After this is
complete, adjust the air and / or FGR as necessary to achieve safe, efficient combustion and
emissions compliance on each point.
10. The following is a summary of what should be achieved for each point on the Ratio Control
Curve:
For standard burners (LMV51, or LMV52 without O
2
trim):
a. Safe, efficient combustion as verified by a calibrated stack gas analyzer
b. The % load matching the fuel flow within +/ ‐ 5%
c. Emissions compliance
d. Smooth Ratio Control Curves (no sharp peaks and valleys)
For standard nozzle mixing burners (no or low % FGR) and O
2
trim (LMV52):
e. All points a thru d above
f. VSD speed should increase with load in a linear fashion (if equipped)
g. The % load matching the fuel flow within +/ ‐ 3%
h. Find and record the %O
2
wet corresponding to the fuel rich limit ( O2 Alarm value) for
each point by probing*
i. Find and record the %O
2
wet corresponding to the fuel lean limit ( O2 MaxValue ) for
Point 1 and Point 10 by probing*
j. Last but not least, leave the curve points so that the %O
2
wet is 2% higher than the fuel
rich limit ( O2 Alarm value). Record this as the saved value for each curve point.
For pre ‐ mix mesh burners and nozzle mixing burners (high % FGR) and O
2
trim (LMV52):
k. All points a thru d above
l. VSD speed should increase with load in a linear fashion (if equipped)
m. The % load matching the fuel flow within +/ ‐ 3%
n. Determine the %O
2
wet corresponding to the fuel rich limit ( O2 Alarm Value) for each
point. Probing may or may not be possible depending on the burner design. Also, follow
burner OEM recommendations. Most mesh burner elements can be damaged if run too
fuel rich.*
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