Siemens LMV50 Series Manual page 260

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Building Technologies
Parameter setting Ign Load TC
The burner is ignited at the temperature-compensated ignition load and is put into
operation with the O2 trim controller initialized.
The trim controller is initialized when driving to ignition load.
The system is therefore not started with excess O2 from the ratio control curves, but
using the O2 setpoint instead.
The initialization value of the manipulated variable is calculated based on the change to
the current supply air temperature in relation to the supply air temperature at the time
the settings were made (Adjust. Temp O2)).
The temperature at which the burner was adjusted is saved automatically for low-fire
point adaption and can be displayed.
A supply air temperature sensor is required for this.
The O2 trim controller is locked initially, but is released once the set locking time
NumberTauSuspend has passed or if the actual O2 value falls below the setpoint.
The dynamic release criterion then becomes active (refer to chapter Behavior in the
event of load changes).
Parameter setting IgnPtWithTC
The burner is ignited at the set ignition positions and is then put into operation with the
temperature-compensated O2 trim controller initialized.
The system is therefore not started with excess O2 from the ratio control curves, but
using the O2 setpoint instead.
The initialization value of the manipulated variable is calculated based on the change to
the current supply air temperature in relation to the supply air temperature at the time
the settings were made (Adjust. Temp O2).
The temperature at which the burner was adjusted is saved automatically for low-fire
point adaption and can be displayed.
A supply air temperature sensor is required for this.
The O2 trim controller is locked initially, but is released once the set locking time
NumberTauSuspend has passed or if the actual O2 value falls below the setpoint.
The dynamic release criterion then becomes active (refer to chapter Behavior in the
event of load changes).
Parameter setting IgnPtWoutTC
The burner is ignited at the set ignition positions and is then put into operation with the
O2 trim controller initialized but without temperature compensation.
The system is therefore not started with excess O2 from the ratio control curves, but
using the O2 setpoint instead.
The O2 trim controller is locked initially, but is released once the set locking time
NumberTauSuspend has passed or if the actual O2 value falls below the setpoint.
The dynamic release criterion then becomes active (refer to chapter Behavior in the
event of load changes).
Display value Gas: Adjust. Temp O2
Oil: Adjust. Temp O2
Parameter Gas: NumberTauSuspend
Oil: NumberTauSuspend
O2 offset during O2 trim controller initialization
For start mode Ign Load TC, IgnPtWithTC and IgnPtWoutTC the offset O2InitOffset is
added to the manipulated variable that was calculated during controller initialization.
This O2 value can be adjusted using parameters.
Parameter Gas: O2InitOffset
Oil: O2InitOffset
Basic Documentation LMV5...
19 O2 trim control with LMV52 and PLL52
CC1P7550en
22.05.2018