Siemens LMV5 Series Basic Documentation page 256

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18.6.2 Checking the O
Every time the burner is started up, the measured residual oxygen content is compared
with the O content of the ambient air at the end of prepurging.
2
For that purpose, the prepurging time of the LMV52... must be parameterized
such that the combustion chamber and the flueways will be completely purged.
Normally, this value reads 20.9 %, but it can be parameterized in the case of plants that
operate with enriched air. This test detects offset errors of the measuring cell. For this
reason, the correct setting of the air's O2 content is safety-related.
Parameter:
O
2
If the O content lies outside the tolerance band of ±2 %, one of the following reactions
2
will take place, depending on the parameterization of «O
Parameter:
O Ctrl/Guard (auto deact / man deact / O
2
conAutoDeac)
man deact O trim controller and O
2
(auto deact): made.
O / O O trim controller / O
2-guard 2- 2
: safety shutdown will take place, followed by a repetition if possible,
control
otherwise lockout.
conAutoDeac: O trim controller and O
2
deactivation». If the test is negative, both the O
the O
2
without O
Basic Documentation LMV51...
18 Addendum 4: LMV52... with O2 trim control and O2 module
content (20.9 %)
2
Content Air
monitor are deactivated. No O
2
monitor is / are activated. If the test is negative,
2
monitor are activated. Option is «automatic
2
monitor will be deactivated. The burner will be started up
trim control.
2
Ctrl/Guard»:
2
-guard / O -control /
2 2
test will be
2
trim controller and
2
CC1P7550en
01.10.2003