Initializing And Release Of The O2 Trim Controller - Siemens LMV50 Series Manual

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Building Technologies
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
Note!
Parameter O2Offset has been renamed toO2ModOffset.
Influencing factor
initializing
Influencing factor
for setting time
(standardized value)
Figure 118: Initializing the O2 trim controller
Basic Documentation LMV5...
19 O2 trim control with LMV52 and PLL52
O2 ratio control (actual)
O2 ratio control (setting time)
O2 setpoint
Load
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CC1P7550en
22.05.2018