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Building Technologies
Basic Documentation LMV5...
CC1P7550en
19 O2 trim control with LMV52 and PLL52
22.05.2018
19.12.3 Setting the O2 trim controller
∂
Setting the O2 min. value
The O2 min. value should be set as low as possible to ensure a high level of
availability.
Caution!
Above or at the O2 min. value, hazardous conditions must not permanently
occur.
Guide values: CO = 2,000 ppm, soot number 3.
The values can vary, depending on the type of plant.
∂
Adequate distance between O2 setpoint and O2 min. value
The distance should be a minimum of 1...1.5% O2. If a smaller distance is used,
the ratio control curve must be set as accurately as possible, in accordance with
chapter
Setting notes- Setting fuel-air ratio control
.
∂
All O2 setpoints must be adjusted under the same environmental conditions
It is important to adjust the O2 setpoints at the same ambient temperatures. If,
later, individual setpoints are changed, all setpoints of the curvepoints must be
readjusted since environmental conditions will probably be different from those at
the time the initial settings were made.
19.12.4 Other notes
When firing on oil and using a VSD, the oil pump must be driven separately.
If this is not observed, the fan speed has an impact on the amount of oil delivered. This
can cause problems in connection with precontrol or O2 trim control.
