FMS Commissioning
O regulation
2
Automatic functions control
during operation
The monitoring bands can be parameterised for 2 fuels, oil/gas, referenced
to each fuel (parameters 923 to 934). In the case of more than 2 curve sets,
these can be assigned to the individual curves via the parameters 912 and
913. The permitted deviation is calculated as a percentage of the target
value. Two separate percentages can be specified for basic load and full
load. The range between those is interpolated linearly.
Monitoring/shut-down times:
1st monitoring band 120 seconds; active
after "Regulator on”
2nd monitoring band 30 seconds; active
after "Burner on”
Factory settings:
1st monitoring band in the upper direction
Basic load
(parameters 923/925)
60%
Full load
(parameters 924/926)
100%
1st monitoring band in the lower direction
Basic load
(parameters 927/929)
40%
Full load
(parameters 928/930)
50%
2nd monitoring band in the lower direction
Basic load
(parameters 931/933)
50%
Full load
(parameters 932/934)
70%
Dynamic probe test
During active operation, the measured O value is monitored by the main
2
processor for any changes. If no greater fluctuation than 0.2 vol.% O is
2
detected over a period of 10 minutes, the fuel/air mixture is altered to force
an air excess. If after 1 minute there is still no change in the actual O value,
2
the test is repeated with a higher air excess. If this does not cause a change
in the actual value, this test is repeated yet again with an even higher air
excess.
If even this does not force a change in the actual O value, the regulator
2
deactivates itself and displays a warning notice.
Thereafter the regulator output (correction input) corresponds to "Base value
without regulation”.
Probe blockage
Blockages in the probe can cause the measured value to increase slowly but
steadily, in such a way that the dynamic probe test is not triggered. The main
processor monitors whether the actual O value drops by more than
2
0.2 vol.% O at least once within 15 minutes. If this is not the case, then a
2
dynamic test is triggered.
Note:
O optimisation fault messages have no effect on the burner's function or that
2
of the combustion system. They only notify that:
O optimisation was deactivated.
2
Note error status and load value.
If desired, it is also possible to have the burner shut down on "Air shortage”
faults via parameter 897.
Correction output monitoring
If the O correction output is constantly greater than 98% [980 points] over
2
60 minutes, the O
regulator is deactivated for safety reasons. The base
2
value for "Deactivated regulation” is output. If thereupon the O value
2
increases significantly, then the O regulator is reactivated as soon as the O
2
2
value is (e.g.) at another load setting in the 1st monitoring band.
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