Siemens LMV5 Quick Start Manual page 134

O2 Module not active or not Available
When attempting to go under:
Params & Display > O2 Module,
the following is displayed "O2 Module not active or not Available".
Check the CANBus wiring to the PLL52 Module.
If this wiring is not correct the LMV5 will not auto detect the PLL52 Module.
Point must lie 0.5 % O2 above O2 Monitor Curve
When setting the O2 Control Curve, messages are received that say "Point must lie 0.5 % O2
above O2 Monitor Curve" or "Point must lie 1.0% O2 below Ratio Control Curve".
Check the following:
1) Ensure that there is an absolute minimum of 1.6 % O2 between the O2 monitor curve and
the O2 ratio control curve.
2) Also ensure that the %O2 that is to be set is at least 0.5% O2 above the O2 Monitor Curve
and 1.0% O2 below the O2 ratio control curve.
3) In practice, it is much easier to make the %O2 gap between the curves larger than the
absolute minimum.
Depending on the burner characteristic, doing this may also lead to more trouble free
operation.
4) If possible:
It is preferable to have a 1 to 1.5% gap,
between the O2 Monitor curve and the O2 Control Curve.
It is also preferable to have a 1.5% gap,
between the O2 Ratio control curve and the O2 Control Curve.
5) Please see Section 6 for more information in these curves.
Note: When setting up the three O2 curves,
these curves must be set using the %O2 values displayed on the AZL5.
These values are %O2 on a wet basis.
A separate combustion analyzer (which typically measures dry %O2)
is useful for reference and to monitor CO and NOx production,
but should not be used to set the three O2 curves.
LMV5 QSG Rev 4 Sec 5 Pg 8 www.scccombustion.com