Siemens LMV5 Quick Start Manual page 69

Fuel-Air Ratio Curves (Combustion Curves)
On most new installations, the Fuel-Air ratio curves are not set by the burner OEM, and must be
set at start-up. If this is the case, the LMV5 will automatically set Point 1 (low fire) to the ignition
position that was previously set. Point 1 can be changed without changing the ignition position if a
low fire different from ignition is desired.
The Fuel-Air ratio curves are programmed by defining points for each actuator / VSD across the
firing range of the burner. These points (a maximum of 15 from low to high fire) are connected in a
"connect the dots" fashion to construct the Fuel-Air ratio curves. The following paragraphs outline a
method to define these points.
After selecting curve params on gas or curve params > curve settings on oil, select 'Point' by
pressing Enter. The cursor will move below the word point. Select which point is to be adjusted by
pressing the arrow keys. If no points exist, 'XXXX' will appear for the actuator positions.
Press Enter on the point to be adjusted. The AZL5 will prompt to change or delete the point. Press
Enter to change the point. The AZL5 will then prompt for followed or not-followed. If followed is
selected the actuators will move real-time when the point is adjusted so that the results of the
adjustment can be seen on a combustion analyzer.
IMPORTANT
: Using not-followed is possible but not recommended for most situations since the
actuators are not moved in real time, so the results of changing the point cannot
be seen real time on a combustion analyzer. When followed is selected, a carat
">" is shown when the actuator / VSD is moving to the displayed position. A colon
":" is shown when the indicated position is reached.
If the arrow key is pressed over to a point that is not defined yet (XXXX shown for the positions and
load), pressing enter will put in values for the positions and load from the last point. The load /
positions can then be adjusted for the new point by scrolling up or down with the arrows and
pressing enter on the load / position to be adjusted. The cursor will move to the number, and the
number can then be adjusted with the arrows, thus changing the position of an actuator / VSD.
Pressing Esc will bring the cursor back to the left, off of the numbers. Pressing escape again, while
off the numbers, will bring up a prompt to ask if the point is to be stored (press enter) or the
changes canceled (press escape). If store is selected, the LMV5 will take a few seconds to store
the point. A bar will rotate on the left hand side of the AZL5 display while the point is being stored.
IMPORTANT:
While the combustion curves are being set, the technician is solely responsible for
maintaining safe combustion conditions for the burner since he / she is in direct
control of the individual actuators. If an AZL5 arrow key is held down when
adjusting an actuator position, the position will be changed at a progressively
faster rate.
LMV5 QSG Rev 4 Sec 4 Pg 13 www.scccombustion.com