Azl Says "O2 Trim Control Automatically Deactivated - Siemens LMV5 Series Technical Instructions

Technical Instructions
Document No. LV5‐1000
AZL Says "O2 Trim Control Automatically Deactivated"
Many different problems can cause the O
happens, check the fault history. The most recent fault will likely be error code BF, diagnostic
00. This is the error code for an automatic deactivation of the O
error code in the fault history to see what actually caused the automatic deactivation. The
most common are:
1. Error code B5, diagnostic code 01. This means that the current O
alarm curve for more than 3 seconds, which caused the O
a. Make sure the load numbers on the Ratio Control Curve match the actual fuel flow.
Use a fuel flow meter if possible.
b. Increase the %O
around the point where the fault occurred (can be determined by the load listed in
the fault history).
Also, parameter O2ModOffset can be increased in 0.5% increments. Parameter
LoadCtrlSuspend can be decreased in 1% increments. See Section 3 for more information
on these parameters.
2. Error code AB, diagnostic code 15 or 16. Check the configuration of the ambient and stack
temperature sensors. If these sensors are activated and are not wired in or are not
functioning correctly, the O
reactivated.
3. Error code AB, diagnostic code 20. Check the temperature of the QGO20 sensor using the
following menu path:
Params & Display > O2 Module > Process Data > QGO SensorTemp
The temperature should be at least 1202
prepurge or anytime during operation, the %O
automatically deactivate. If this is the case, the QGO20 sensor may be mounted improperly
or the gas velocity may be too high.
Section 7
trim control to automatically deactivate. When this
2
gap between the O Control Curve and the O
2 2
trim will automatically deactivate immediately after it is
2
o
F. If the temperature falls below this value during
2
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trim. Check the previous
2
value went below the O
2
trim to deactivate.
2
2
cannot be read and the O
LMV Series
2
Alarm Curve at and
trim will
2
SCC Inc.