Special Function Curve Settings Farc - Siemens LMV5 Series Basic Documentation
Burner control with integrated fuel / air ratio control, burner control with load control and oxygen trim control for forced-draft burners
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Special function
curve settings FARC
Siemens Building Technologies
HVAC Products
The following section covers the parameter settings of the curves used by the basic unit
module «Fuel / air ratio control».
S e l e c t i o n m e n u « R a t i o c o n t r o l »
The selection menu looks as follows:
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Selection of 3) through 6) leads to standard parameter settings of the parameters
specified.
Selection of 1) leads to:
S e l e c t i o n m e n u « S e t t i n g s g a s »
Only the data associated with the currently active type of fuel can be parameterized.
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Calling up 1) (HomePositions, PrepurgePositions...), 3) and 4) leads to standard
parameter settings of the parameters specified.
Selection of 2) leads to:
S e l e c t i o n m e n u « C u r v e P a r a m » ( m o d u l a t i n g )
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In this example, the ignition positions are copied to the first point of the curve.
This is always made automatically when the ignition positions are defined but no point
on the curve has as yet been entered. The preliminary load value entered is the position
value of the fuel actuator.
This point is also automatically approached as the low-fire point.
If the installer attempts to reach submenu «Curve parameter settings» before the
ignition positions are defined, point number «1» appears. But the position fields display
«XXXX», indicating that the data are invalid.
When making the parameter settings, the installer is guided, starting with entry of the
ignition positions and coarse adjustment of the low- and high-fire positions to fine
adjustment of the curve settings with up to 15 curvepoints.
This setting of the curve can be made in 2 different ways:
1. Individual points are specifically entered.
2. Ratio control is operated manually until the value reached shall be stored as a new
point.
A more detailed description of both approaches is given below:
Basic Documentation LMV51...
7 Display and operating unit AZL5...
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CC1P7550en
01.10.2003
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