Unigas C120A, Installation Manual

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34
10.6 Main parameter of the FGR function
Parameter Description
LMV50
LMV51.3
LMV52.2
LMV52.4..
.
DelaytimeFGR Gas
DelaytimeFGR Oil
Setting of delay time for auxiliary actuator 3 to be kept in the ignition position after entering phase
OPERATION
● ●
ThresholdFGR Gas
ThresholdFGR Oil
Setting of temperature that must not be exceeded so that auxiliary actuator 3 can be kept in the
ignition position
●
FGR-sensor
(
X86 PtNi1000 /
X60 Pt1000 /
X60 Ni1000)
Selection of temperature sensors for temperature-compensated flue gas recirculation (FGR)
● ●
Factor FGR Gas
Factor FGR Oil
Readjustment of calculated temperature-dependent position of auxiliary actuator 3.
The setting is made in steps of 1%.
100% means no readjustment.
Settings <100% reduce the amount of recirculate flue gas (moving the damper toward the fully
closed position).
The factor has an impact only when there is a deviation from the learned flue gas recirculation
(FGR) temperature.
This means that when reaching the initially acquired flue gas recirculation (FGR) temperature,
the stored position is approached, independent of the flue gas recirculation (FGR) factor.
See the
Examples of tables showing the damper positions with FGR
●
FGR MinPos
Minimum limitation of position of auxiliary actuator 3 for
temp.comp.
and
TCautoDeact
modes.
The setting is made as an absolute value and ensures that flue gas recirculation (FGR) always
operates with at least a minimum amount of flue gas.
The position is also used to ensure a defined damper position for emergency operation or
automatically deactivated flue gas recirculation (FGR)
●
FGR MaxPos Fact
Maximum limitation of the required position of auxiliary actuator 3 calculated from the current
temperature and the warm position.
The setting is made in steps of 1% and refers to the relevant curve-point.
Interpolation between the curve-points is linear
●
The parameter are in side the AZL menu with following structure:
1st level 2nd level 3rd level 4th level 5th level 6th level Description
Param & Display
Flue Gas Recirc
FGR-sensor
X60 Pt1000
X60 Ni1000
According to the available probe
ThresholdFGR Gas
ThresholdFGR Oil
0…850 °C According to the regulation needs
DelaytimeFGR Gas
DelaytimeFGR Oil
0…63 min According to the regulation needs
Factor FGR Gas
Factor FGR Oil
10..100% According to the regulation needs
FGR MinPos According to the regulation needs
FGR MaxPos Fact 0..100% According to the regulation needs
WARNING: Only in case of FGR temperature compensation function.
If the detected temperature value is lower than the value recorded during the curve setting, the AUX3 servomotor doesn’t reach
the set position, but it will be closer. In this condition flue gas recirculation flow could be not sufficient or too much.
NOx value could be different from the expected or the flame could be instable. Try to reduce the correction factor (“Factor FGR
Gas” or “Factor FGR Oil"). In case readjust the FGR curve. Probably the point was saved also if the flue gas temperature were
too far from the regime condition.