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

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6.7.5 Legend to the sequence diagrams

Valve proving takes place depending on the parameter:
Between phase 62 and phase 70 or / and between phase 24 and phase 30
1) Parameter: Short / long preignition time for oil only
Short / long oil pumps – switch-on time – time
2) Only with valve proving on startup
3) Parameter: With / without alarm in the event of start prevention
4) In the event of an erroneous signal on startup, followed by phase 10, otherwise phase 70
5) 28 s = maximum time safety phase, followed by lockout
6) 5 s = time between occurrence of start prevention and signaling
7) Only with valve proving on startup (valve proving via pressure switch-min)
8) Only without valve proving on startup (valve proving via pressure switch-min)
9) Inverse logic with valve proving via pressure switch-min
10) Parameter: Oil pressure min input
1 = active from phase 38
2 = active from safety time
11) Only with fuel train Lo and 2 fuel valves
12) Repetition limitation pressure switch-min-gas in connection with gas shortage
Parameter 223:
program parameter 246 (phase 90)
13) 30 s = max. drop-in / response time for air pressure switch
Assignment of times:
t1 Prepurge time
t8 Postpurge time
t13 Permissible afterburn time
t44 Interval 1 gas / oil
t52 Interval 2 gas / oil
TSA1 Safety time 1 gas / oil
TSA2 Safety time 2 gas / oil
Permissible position range
In standby: The actuator can be moved within the permissible position range, but is always
driven to the no-load position. Phase changes necessitate the no-load position.
0° Position as supplied (0°)
90° Actuator fully open (90°)
AL Alarm
FS Flame signal
KL Low-fire position
LK Valve proving
LP Air pressure switch
M Fan motor
N Postpurge position / postpurging
P LT Valve proving (pressure switch)
Pmin Pressure switch-min
Pmax Pressure switch-max
POC Proof Of Closure
PV Pilot valve
R Control thermostat or pressurestat
SA... Actuator
SA-R No-load position
SA-V High-fire position
SA-Z Ignition position
SB Safety limiter
SK Safety loop
SV Safety valve
V High-fire position
V... Fuel valve
Z Ignition transformer
Signal ON
Signal OFF
Permissible signal
Basic documentation LMV37.4...
6 Basic unit
CC1P7546en
01.12.2009