Azl Says "Measurement Not Successful" When Measuring The Delay Time For O 2 Trim - Siemens LMV5 Series Technical Instructions

LMV Series
AZL Says "Measurement not Successful" When Measuring the Delay Time for O2 Trim
When setting the low fire point or the high fire point on the O
what is called the "delay time" (Tau time). The delay time is defined as the length of time it
takes a change in the air damper position to be detected by the O
low fire and shorter at high fire due to gas velocity. If an error occurs while trying to measure
this delay time, the AZL says "Measurement not Successful".
To troubleshoot this, check the following:
1) Verify that OptgMode is set to "man deact" using the following menu path:
Params & Display > O2Contr/Alarm > Gas/Oil Settings > OptgMode
2) Verify that LowfireAdaptPtNo is set to 2 (combustion curve point 2) or higher if desired. By
default, this parameter is set to "X" (undefined). The menu path for this parameter is:
Params & Display > O2Contr/Alarm > Gas/Oil Settings > Control Param >
LowfireAdaptPtNo
3) If both of the above parameters are set correctly, then it is possible that the O
the ratio control curve were set incorrectly. When setting each point on the O
curve, the LMV5 will prompt with the message "When value stable continue w ENTER".
Pressing ENTER then sets the %O
before the O value has stabilized, a non‐representative O
2
ratio control curve. If this is the case, go back into the O
wait to get a stable reading before pressing ENTER to ensure that the O
representative of the current air damper position. 30‐60 seconds is not too long to wait
once the arrow (>) turns into a colon (:) indicating that the actuators have stopped moving.
SCC Inc.
for the ratio control curve. If ENTER is pressed too early
2
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Technical Instructions
Document No. LV5‐1000
control curve, the AZL measures
2
sensor. This time is longer at
2
readings on
2
control
2
value will be entered for the
2
control curve and at each point
2
reading is
2
Section 7