Siemens LMV3 series, Technical Instructions

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Technical Instructions LMV Series
Document No. LV3-1000
Section 4
Page 22 SCC Inc.
7. Still at P9 (high fire), hold the - button down until “CALC” is displayed.
NOTE: The CALC feature draws a linear curve between the point just set and either P1 (low
fire) or P9 (high fire). Holding the + button after setting any curve point will linearize the
curve from that point up to P9 (high fire). Holding the - button after setting any curve point
will linearize the curve from that point down to P1 (low fire).
At this point, a linear curve is entered between Point 1 (low fire) and Point 9 (high fire). Moving
now from Point 8 down to Point 1, continue to set each point at the calculated fuel flow (or
burner head pressure). After each point has been set to achieve safe, efficient combustion and
emissions compliance, hold the - key to perform the CALC function again and move to the next
point. After Point 1 has been set, press the Escape button.
8. Parameter 546 will be displayed. Parameter 546 sets the maximum fire rate of the burner.
Once this has been set, press the + button.
9. Parameter 545 will be displayed. Parameter 545 sets the minimum fire rate of the burner. Once
this has been set, press the Escape button.
NOTE: Parameter 545 can only be set as low as 20%. This does not mean that the turndown
of the burner is limited to 5:1. The LMV3 always denotes low fire as 20% load, even though
the actuator / VSD positions set at Point 1 can achieve a much lower fire rate.
10. Parameter 400 appears. Press Escape. If the curve was set up correctly, the display should now
show “oP” followed by the fire rate of the burner.
11. The following is a summary of what should be achieved for each point on the Ratio Control
Curve:
a. Safe, efficient combustion as verified by a calibrated stack gas analyzer
b. Emissions compliance
c. Smooth Ratio Control Curves (no sharp peaks and valleys)
d. VSD speed should increase with load in a linear fashion (if equipped)