Siemens LMV5 Series Technical Instructions page 183

LMV Series
11. The AZL52 will then prompt "when value stable, continue with ENTER". After the burner is at Point
2, wait at least an additional 30 seconds to make sure that the O
of Point 2, then press Enter. Pressing Enter stores the O
is stored should be close (+/‐ 0.2%) to the "saved" value that was recorded for Point 2 during Ratio
Control Curve commissioning.
NOTE: It is important to wait long enough to get a steady‐state O
If in doubt, wait longer for the value to stabilize. Waiting longer than necessary has no ill effects
for the O trim commissioning.
2
NOTE: If the O value displayed on the AZL52 is not steady (oscillating more than +/‐ 0.1% O
2
likely that the O sensor is not mounted correctly, or there are other issues with the burner /
2
boiler that are affecting the fuel / air ratio. These issues must be corrected before proceeding.
12. Next, slowly increase the StandardVal number, which reduces the air flow into the burner. The
reading beside O2 Control should start to drop as StandardVal is increased. Note that the Tau time
of the boiler comes into play here, so it may take 10‐15 seconds or more for a change in the
StandardVal number to be seen in the O
13. Once the StandardVal number has been increased enough to get the %O
least 0.5% O above the O
2
stored. This is done by pressing Enter, Escape, and then Enter again.
14. After the point is stored, the delay time at Point 2 (Tau Low‐Fire) will be measured. This should
occur and the AZL52 should state "Measurement Successful, Control Parameters Stored".
15. The rest of the Points (3 thru 10) can now be done in a similar manner. The delay time (Tau High‐
Fire) will also be measured at the high fire point, in this case Point 10.
16. After the delay time is successfully measured at Point 10, escape out of the O
Figures 6‐4 and 6‐5 below for an example of what typical O
might look like for this application.
17. The O trim can now be activated in one of two modes. Mode "conAutoDeac" allows the O
2
work as long as the measured %O
MaxValue). If either of these limits is exceeded, the O
on the normal Ratio Control Curves. Mode "O2 Control" also allows the O
if the limits are exceeded a lockout will occur. Mode "conAutoDeac" is typically used. To set the O
control operating mode, use the following menu path:
Params & Display > O2Contr/Alarm > Gas Settings > OptgMode
18. The O trim is now commissioned and activated. Some additional tuning may be required
2
depending on the application. See "Post Commissioning Tuning" later in this section for more
information.
SCC Inc.
reading.
2
Alarm and 1% below the O
2
does not exceed the rich limit (O
2
Page 11
HOME
Technical Instructions
Document No. LV5‐1000
value being read is representative
2
Ratio Control Curve point. The value that
2
value before Enter is pressed.
2
into the target band (at
2
Ratio Control Curve point), the point can be
2
Control Curve. See
2
trim curves and Lambda Factor curves
2
Alarm) or the lean limit (O
2
trim will deactivate and the burner will run
2
trim to work, except that
2
), it is
2
trim to
2
2
2
Section 6