Deactivating O2 Trim Control Via A Contact - Siemens LMV50 Series Manual

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Building Technologies

19.4.13 Deactivating O2 trim control via a contact

There are two different ways of deactivating the O2 trim control via a mains voltage
signal at input X5-03 pin 2:
1. Parameterization to DeaO2/Stp36
O2 trim control can be deactivated via a mains signal at terminal X5-03 pin 2.
The system then operates along the ratio control curves. The O2 alarm function
remains active. If the mains signal is switched off, O2 trim control is reinitialized and
activated.
This function is activated by setting parameter Config X5-03 to DeaO2/Stp36.
Parameter Config X5-03 (DeaO2/Stp36)
Note!
∂
This function can only be used if inputs X5-03 pin 2 and X5-03 pin 3 are not already
being used to connect an external load controller (LC_OptgMode = ExtLC X5-03)
↑ invalid parameter setting
∂
This parameter setting activates also to stop a startup in phase 36 by switching off
the mains voltage at X5-03 pin 3 (only for non-safety-related applications).
If this function is not used simultaneously with the O2 deactivation function, input
X5-03 pin 3 has to be linked with X5-03 pin 4 (L)
2. Parameterization to AutoDeactO2
Alternatively, the operating mode of the O2 trim controller can be changed via a mains
signal at input X5-03 pin 2 from conAutodeact to auto deact by parameterizing Config
X5-03 to AutoDeactO2.
The system then operates along the ratio control curves.
The O2 alarm function remains active while a valid O2 signal is present, see also
chapter Operating modes O2 trim controller.
The display message O2 trim control automatically deactivated which is otherwise
displayed is not shown when switching via a mains signal at input X5-03.
If the mains signal is switched off, the O2 trim control is initialized and activated again.
The O2 control operating mode is reset to RegAutoDeact.
If the system is already in the O2 operating mode auto deact, the display message O2
trim control automatically deactivated is no longer displayed when this contact is
closed.
Parameter Config X5-03 (AutoDeactO2)
Notes!
This function can only be used if the inputs X5-03 pin 2 and X5-03 pin 3 are not already
being used for an external load controller (LC_OptgMode = ExtLC X5-03)
↑ invalid parameterization.
Basic Documentation LMV5...
19 O2 trim control with LMV52 and PLL52
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22.05.2018