Installation and operating instruction
Combustion manager W-FM 100 und W-FM 200
6 Operation
83054802 1/2018-07 La
97-228
6.10 O2 controller
O
2
trim is only possible in modulating operation with W-FM 200 with O
2
module.
O
2
trim is fuel specific and must be set separately for each fuel on dual fuel burn-
ers.
O
2
trim and O
2
monitor in conjunction with the O
2
residual content are at the com-
bustion limit and the resulting O
2
compound curve.
An idealised minimum O
2
value is advantages for the control behaviour. When op-
timising the minimum O
2
value increase rather than decrease. In conjunction with
CO control (accessory) the minimum O
2
value must be set to ap-
prox. 0.25 to 0.5 percentage points below the combustion limit.
0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
4,5
5,0
5,5
6,0
6,5
0
10
20
30
40
50
60
70
80
90
100
2
1
3
4
5
6
1
Burner capacity [%]
2
O
2
content in the flue gas [%]
3
O
2
residual content at the combustion limit
4
Minimum O
2
value for O
2
monitor
5
O
2
setpoint for O
2
trim
6
O
2
compound, excess air in the load points 20 to 25 %
With frequency converter
On burners with frequency converter, parameter
VSD
can be used to determine if
the frequency converter is to be included in O
2
Pre-control
The O
2
controller is equipped with a pre-control function. The pre-control calcu-
lates the air ratings reduction for the entire load range relative to the fuel on the
basis of measured values during commissioning. If the load is changed, the air influ-
encing actuators drive to the calculated position, whilst the fuel actuator drives to
its load position. O
2
trim is only activated if temperature or air pressure deviations
occur and and then drives the air influencing actuators.
To ensure the pre-control operates correctly, the load apportionment must match
the fuel throughput in each load point [ch. 6.9.5].
Summary of Contents for W-FM 100
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