48
7 O
2
Trim
7.9 Commissioning
You must set several of the O
2
parameters before you can program the O
2
curve. For param-
eter adjustment see chapter 6.1 Before Commissioning).
You will find a list of O
2
parameters in a separate document (DLT1045).
7.9.1 Setting the Correction Range and the Correction Mode
The correction value (control signal) transmitted to the electronic fuel/air ratio control is 0
…100% with a resolution of 0.1%.
0% corresponds to maximum excess air, 100% to minimum excess air. Factory setting is a
neutral value of +60% to -40%. This means that the control range in the direction of excess
air is 60% and in the direction of air deficiency it is 40%. The main focus of this base setting
is that contamination of the burner and the boiler during the operational period would result in
an increase in the installation's flow resistance. Thus a larger control range in direction excess
air could be an advantage.
If another correction mode is selected via p 437, the base setting also changes at the same
time:
Calling up the base setting (only when burner stationary).
Calling up the base settings (only when the burner is not running)
The correction mode specifies the correction’s effect. A variety of settings are possible.
7.9.2 Available Correction Modes
Correction type 1 is used when correction is applied to a linear control element, e.g. to the fre-
quency converter’s setpoint for adjusting the combustion air blower’s speed. The correction is
directly added to or subtracted from the setpoint.
Correction mode: Effect to the setpoint axis
In Correction Mode Base Settings
+50% .... -50% 50,0%
-50% .... +50% 50,0%
+60% .... -40% 60,0%
-60% .... +40% 60,0%
0% .... -100% 0,0%
-100% ..... 0% 100,0%
press "Reset"
press key 16 the display shows the firing rate values
press "Enter" the display shows the base settings
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