45
6 O
2
Trim
6.9.2.2 Correction Type 2
Correction type 2 is used where the correction is applied to a non-linear control element, e.g.
air damper. The curve's slope is taken into account before calculating the correction. A flatter
curve results in a smaller correction range, whilst a steeper curve results in wider range.
Correction mode: Effect to firing rate axis +60% to -40%
Fig. 6-3 Correction type 2
6.9.3 Setting the Correction Range
Use parameter 517 to adjust the correction range from 0 to 999.
Example: Ccorrection mode P 437 for O
2
trim is +60/-40
Correction range P 517 is 100 (digit).
This means:
The adjusting range of the setpoint which can be modified in correc-
tion mode should be between +60 (digit) and -40 (digit).
E.g. With a current setpoint of 200 digit, the modifiable by correction
adjusting range lies between 260 digit (excess air) and 140 digit (air
deficiency).
Recommendation: You should chose the correction mode and the correction range in
that way, that the correction effect on the O
2
value is -2 to 3 vol.% O
2
in direction excess air, and 1 to 1.5 vol.% O
2
in direction air deficiency.
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