Program Stop Function; Gas Shortage Program - Siemens LMV50 Series Manual

Sequence diagram
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4.2.3.7 Program stop function

To simplify burner adjustments during commissioning or in connection with
maintenance work, the control sequence of the LMV5 can be stopped at the following
points:
a) Air damper in the prepurge position
b) Traveling to the flue gas recirculation (FGR) position 32
c) Ignition position
d) Interval 1
e) Interval 2
f) Air damper in the postpurge position
g) Traveling to the flue gas recirculation (FGR) position 76
Activation takes place via the relevant menu items on the AZL5.
The program stop function is maintained until manual deactivation takes place. If the
system stops at a program stop, a message appears on the AZL5.
Parameter ProgramStop (deactivated / 24 PrePurgP / 32 PreP FGR / 36 IgnitPos /
44 Interv 1 / 52 Interv 2 / 72 PostPPos / 76 PostPFGR)

4.2.3.8 Gas shortage program

When gas pressure is insufficient (input gas pressure switch-min), the LMV5 ensures
that a selectable number of start attempts (StartRelease-1) are made while observing
a selectable waiting time.
The waiting time between the start attempts is automatically doubled, based on the
value parameterized for the first waiting time = basic waiting time (DelayLackGas).
If, upon the last of the parameterized start attempts, there is still a shortage of gas, the
burner control initiates lockout.
Parameter StartRelease
DelayLackGas
12
Basic Documentation LMV5...
4 Burner control
Phase
24
36
44
52
72
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Alarm
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CC1P7550en
22.05.2018