Siemens LMV5 Series Basic Documentation page 268

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18.12 Setting notes
(Summary of the most important rules for setting O
18.12.1 Parameter settings
•
Parameterize all truly air-influencing actuators as air-influencing actuators
If changing the parameter settings, O
18.12.2 Setting O2 ratio control
•
Set sufficient excess O2
Set the amount of excess air of the ratio curve such that, whatever the
environmental conditions (combustion chamber and fuel pressure, temperature and
pressure of the combustion air), the set residual oxygen content will lie above the
O setpoints required by O
2
Example:
O (%)
2
1
6
5
4
3
2
1
•
Parameterized load proportional to the fuel rate
The burner load parameterized at the curvepoints must be proportional to the
actual burner load. To make the setting, determine the burner load with the help of
the fuel counter.
•
Curvepoint 1
The first curvepoint should have an adequate distance below curvepoint
means that the curve for reducing the air rate is also defined below point
guide value, point
be smaller than or equal to the low-fire load.
If, in the low-fire position, no further air reduction is possible (e.g. because the air
damper has already fully closed), curvepoint 1 must be selected as the low-fire
point. In that case, O2 trim control will only be performed up to curvepoint 2.
Basic Documentation LMV51...
18 Addendum 4: LMV52... with O2 trim control and O2 module
trim control must be readjusted.
2
trim control.
2
Stützpunkte
4
2 3
should lie at about half the load of point
trim control)
2
5
Veränderung des O
über Umgebungsbedingungen
O -Verbund
2
O -Sollwert
2
O -Minwert
2
Leistung (%)
100 %
. Point
-Verbunds
2
. This
. As a
should
CC1P7550en
01.10.2003