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Building Technologies Basic Documentation LMV5... CC1P7550en
19 O2 trim control with LMV52 and PLL52 22.05.2018
Load at which a system is ignited with O2 trim control and Startmode parameter set to
Ign Load TC.
Parameter Gas: Load of Ignition
Oil: Load of Ignition
19.4.6 Initializing and release of the O2 trim controller
Parameter setting standard
With this setting, the LMV52 behaves as it did before this parameter was introduced.
The burner is started with the O2 trim controller locked and is put into operation along
the safe ratio control curves.
The locking time for startup commences when operating phase 60 is entered.
It is defined as a multiple of the Tau Low-Fire value using the NumberTauSuspend
parameter (NumberTauSuspend x Tau Low-Fire).
Once this locking time has passed, the O2 trim controller is initialized and after a further
4 x Tau Low-Fire released.
The dynamic release criterion then becomes active (refer to chapter Behavior in the
event of load changes).
For initialization, the start value of the manipulated variable is calculated.
An offset is added to this, which is defined using the O2ModOffset parameter.
Parameter NumberTauSuspend
Gas: O2ModOffset
Oil: O2ModOffset
Β
Note!
Parameter O2Offset has been renamed toO2ModOffset.
O2 ratio control (actual)
O2 ratio control (setting time)
O2 setpoint
Load
Influencing factor
for setting time
(standardized value)
Influencing factor
initializing
7550d42e/1012
Figure 118: Initializing the O2 trim controller
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