Lme71 Phase Diagrams - Siemens LME7 Series Technical Instructions

LME Series

LME71 Phase Diagrams

The Siemens LME7 burner controls can perform a number of different burner sequences based
upon which PME7 program module is used, how certain parameters are set, and how the LME7
is wired.
Each program module has an associated phase diagram. The phase 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.
Notes:
1) A jumper can be added between terminals X7-04.4 and X7-01.3 for direct spark ignition.
If this jumper is added, main valve output X7-04.4 and pilot valve output X7-01.3 will be
energized from phase 40 through the end of operation (oP1).
2) If the LME7 is set to perform valve proving on startup, valve proving takes place at the
same time as prepurge. Phases 80-83 will be displayed on the LME7 and the AZL23 even
though prepurge (phase 30) is also occurring at the same time. The actual prepurge time
will be at least the sum of all four valve proving time parameters (242, 243, 244, 245).
3) If the LME7 is set to perform valve proving on shutdown, valve proving takes place at the
same time as postpurge. Phases 80-83 will be displayed on the LME7 and the AZL23 even
though postpurge (phase 74) is also occurring at the same time. The actual postpurge
time will be at least the sum of all four valve proving time parameters (242, 243, 244,
245).
SCC Inc. Page 11
Technical Instructions
LME-1000
Section 2