Max. reduction of primary air in FGR mode
Specifies the amount by which the primary air (fresh air)
can be reduced at maximum FGR primary air. Please note
that the reduction is dependent on the infeed level and that
the maximum reduction will not necessarily have been
achieved at the point when the parameter "CCT signal for
primary FGR stop" is reached. At full FGR primary air (=
Maximum FGR Primary) and maximum feed level, the
maximum reduction to the primary air will also be active.
FGR primary air delay
FGR activation delay to prevent vibration.
FGR power influence
Specifies as a percentage the influence that the current
infeed level has on the FGR primary air. If this parameter
is set to 100%, then the FGR primary air will adjust
downwards proportionally to the feed level. If this
parameter is set to 0%, then the FGR primary air is
adjusted according to the combustion chamber signal and
the calculated curve, and ignores the infeed level. At
minimum output, this may result in the primary air being
adjusted up to the maximum value. If the power influence
is set to a negative value, this function is inverted. For
negative values the FGR primary air is increased in
proportion to the infeed rate.
Prim. FGR increase curve
Specifies which curve will be used to control the FGR
primary air from the start point (“CCT signal for primary
FGR start” parameter) to the stop point (“CCT signal for
primary FGR stop” parameter).
Prim. FGR decrease curve
Specifies which curve will be used to control the FGR
primary air from the stop point until the maximum
combustion chamber temperature is reached.
FGR control after
Specifies after which temperature the FGR is controlled.
Max. increase of EGR control
Specifies the maximum speed of changes to the FGR
control. This results in an attenuation that prevents any
changes to the control being implemented too quickly.
Max. reduction of EGR control
Specifies the maximum speed of changes to the FGR
control. This results in an attenuation that prevents any
changes to the control being implemented too quickly.
FGR run-on stop at
When shutting down, the FGR remains active until the
combustion chamber temperature has fallen below this
value.
FGR flap max. time open
If the flap does not open after this time, a fault is issued.
Air vane max. time close
If the flap does not close after this time, a fault is issued.
Air flap primary FGR stop 0% opening
If the value is below this, the flap is detected as being
open. Due to tolerances in the return signal, an open flap
may return an opening of a few %.
Air flap primary FGR stop 100% opening
If the value is above this, the flap is detected as being
open. Due to tolerances in the return signal, an open flap
may return an opening of just under 100%.
Menus and parameters
5
Boiler
Service manual SPS 4000 | B0960622_en
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