Siemens LMV5 Series Technical Instructions page 105

LMV Series
3‐3: Sequence Diagrams
The Siemens LMV5 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 FuelTrainGas and FuelTrainOil.
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 three different gas trains with their associated sequence diagrams, and one of four different oil trains
with their associated sequence diagrams (the sequence diagrams and fuel train diagrams for direct spark ignition with heavy oil
have been omitted).
The sequence diagrams in Section 3‐3 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) Only one fuel select terminal can be energized at a time. If both terminals are energized, the LMV5 will go into lockout. If
neither terminal is energized, fuel selection is internal through the AZL5 (FuelSelect) or via Modbus.
2) The external burner on / off switch can be disabled with parameter InputController. If activated, this terminal needs to be
energized to have the LMV5 start its sequence. The function of terminal X5‐03.1 becomes "burner on / off" when any
external load control mode is selected.
3) The alarm can be silenced through the AZL (Alarm act/deact). This alarm silence resets when the LMV5 is reset or restarted.
4) When using an LMV52, continuous pilot is possible (ContPilotGas / ContPilotOil). If continuous pilot is activated, the pilot
valve will remain energized through phase 62.
5) If parameter GasPressureMin is set to activated, the low gas pressure switch is expected to remain closed during phases 21‐
50 of LO w Gasp and HO w Gasp, ensuring adequate gas pressure for the pilot. If GasPressureMin is set to Deact xOGP, the
low gas pressure switch is expected to remain closed only when firing gas and is not checked when firing oil.
SCC Inc. Page 47
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