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Building Technologies Division User Manual LMV5... CC1A7550.5en
COx supervision and control 07.07.2015
4.7.3 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.
4.7.4 Setting the COx supervision
Note!
The OEM customer is responsible for setting the COx sensor system.
Set the following parameters as described in the chapter Operating modes of COx
supervision:
Parameter NumberTauSuspend (5..140)
Time COx Alarm (0..600 s)
O2ModOffset (0..5% ) (only in COx controller mode)
The function is activated as alarm or controller with the parameter OptgMode COx Gas.
Parameter OptgMode COx Gas (deactivated, COx Alarm, COx Control)
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