LMV Series Technical Instructions
LV3-1000
SCC Inc. Page 18 Section 3
Sequence Diagrams
The Siemens LMV3 BMS can perform a number of different burner sequences based upon how certain parameters are set.
Although there are a number of parameters that affect small aspects of the burner sequence, the main parameters that affect the
sequence are parameters 201 and 301.
These parameters set the framework of the sequence and are based upon the fuel train diagrams in Section 4. The OEM has the
option of selecting one of fourteen different gas trains with their associated sequence diagrams, and one of fifteen different oil
trains with their associated sequence diagrams.
The sequence diagrams illustrate when input and output terminals are expected to be energized or de-energized. A legend on the
bottom of each page describes the various symbols used in the diagrams. The last diagram describes what positions the attached
actuators are expected to achieve at each phase and outlines the method that is used to check the actuators position.
Notes:
1) If parameter 235/335 is set to 2, air pressure switch input X3-02.1 can be de-energized in phases 60-66 without an alarm.
This is only allowed on pneumatic fuel trains.
2) After the main valves open, the high and low pressure switch inputs are ignored for the length of time specified by
parameter 229/269/329/369. This is done so that pressure shocks do not cause erroneous alarms on properly adjusted
automatic reset pressure switches.
3) Parameter 237/277/337/377 sets the function of input X5-02.2.
4) Parameter 210 determines if the alarm output will energize in the event of a start prevention (an alarm in standby). If set to
1 (activated), the LMV3 will wait 5 seconds after receiving a call for heat before going into alarm.
5) Parameter 276/376 defines the phase when the low oil pressure switch input X9-04.2 must be energized. A setting of 1
means the input must be energized in phase 38 (parameter 217 sets the length of time after the beginning of phase 38 that
the input must be energized). A setting of 2 means the input must be energized by the beginning of safety time 1 (phase 40).
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