Legend To The Sequence Diagrams - Siemens LMV37.4 Series Basic Documentation

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7.7.8 Legend to the sequence diagrams


Note
Not all phases, times, indices, abbreviations and symbols appear in the
individual sequence diagrams or are needed there!
Phase numbers
00 Lockout phase
02 Safety phase
10 Home run
12 Standby (stationary)
22 Fan motor (M) = ON, safety valve (SV) = ON
Air damper (LK)  fuel valve (V) – position
24
30 Prepurging
Air damper (LK)  ignition (Z) – position
36
38 Preignition ignition (Z) = ON
39 Test pressure switch-min (Pmin)
40 Fuel valve (V) = ON
42 Ignition (Z) = OFF
44 Interval 1 (t44)
50 Safety time 2 (TSA2)
52 Interval 2 (t52)
60 Operation 1 (stationary)
Operation 2 air damper (LK)  low-fire (KL) – position
62
64 Switching back to pilot: Modulation to ignition load
65 Switching back to pilot: Interval 2 waiting time
66 Switching back to pilot: Reactivation of ignition + pilot
67 Switching back to pilot: Shutdown of main valves
68 Switching back to pilot: Pilot mode waiting phase
69 Switching back to pilot: Pilot mode waiting phase for burner startup
70 Afterburn time (t13)
Air damper (LK)  Rated load (NL) – position
72
74 Postpurge time (t8)
78 Postpurge time (t3)
80 Evacuation of test space
81 Atmospheric pressure test
82 Filling of test space
83 Gas pressure test
90 Gas shortage waiting time
Valve proving is performed depending on the parameter settings:
Simultaneously with the prepurge time and/or the afterburn time.
Times
TSA1 1st safety time
TSA2 2nd safety time
t1 Prepurge time
t3 Postpurge time
t8 Postpurge time
t13 Afterburn time
t44 Interval 1
t52 Interval 2
Basic documentation LMV37.4...
7 Basic unit
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20.09.2013