Siemens LME7 Series Technical Instructions page 29

LME Series
LEGEND - Password Level: S = Service; O = OEM; S/O = View - Service, Write - OEM; Info = Info Menu; Ser = Service Menu
Parameter
Shaded Parameters = Frequently Used
Parameter Name
Number
PW Level
Time Air Pressure
224
Switch
225 Prepurge Time
226 Pre-Ignition Time
Pilot / Main
230
Stabilization Time
Pilot and Main Overlap
231
Time
234 Postpurge Time
235 Air Pressure Switch
237 POC Switch
239 Forced Intermittent
240 Repetition Flame
SCC Inc.
Default Range
13.818 sec 0-13.818 sec
111 - 29.106 sec
0-1237 sec
901 - 19.404 sec
3.087 sec 1.029-37.485 sec
111 - 3.234 sec
112 - 3.234 sec 3.234-74.97 sec
S/O
901 - 15.582 sec
9.996 sec 0-74.97 sec
111 - 19.404 sec
0-1237 sec
901 - 4.851 sec
0 0-1
S 1 0-2
0 0-1
S/O
Index 00 = 0-2
0
Index 01 = 0-4
200 Level: Burner Control
Once the LME7 reaches phase 22 for the second time (between phases 24 and 30), this sets the length of
time the LME7 will wait for air pressure switch input X3-02.1 to become energized before a lockout occurs
due to lack of air pressure. As soon as the switch is made, the sequence progresses.
Sets the prepurge time (length of phase 30). The LME7 has a base prepurge time of 2.1 seconds. This
setting adds seconds to the base time.
The period of time that the ignition transformer (output X4-02.3) is energized before the main valves are
opened. Sets the length of phase 38.
On PME71.111A1 and PME71.112A1, this setting defines the pilot stabilizing period if a pilot is used.
During this period, only the pilot valve is open. The spark is de-energized.
On PME71.901A1, this setting defines the main stabilizing period. During this time, only the main valves
are open. The spark is de-energized. Sets the length of phase 44.
When a fuel train with a pilot is used, this setting defines the overlap of the pilot (output X7-01.3) and the
main fuel valves (output X7-04.4). After this time expires, the pilot is de-energized. Sets the length of
phase 50.
Sets the postpurge time (length of phase 74).
This setting activates or deactivates the air pressure switch input X3-02.1.
0 = deactivated
1 = activated
This setting defines the function of POC switch input X2-02.4.
0 = deactivated
1 = activated (verify POC switch is closed on startup and shutdown)
2 = activated (verify POC switch is closed on startup and shutdown, and open during operation)
When activated, this forces the LME7 to shut the burner down every 24 hours of uninterrupted operation.
The burner will automatically restart afterwards. The purpose of the shutdown is to check and cycle safety
devices. The PME73.840A1 will recycle every 24 hours.
0 = deactivated
1 = activated
This sets the numbers of times a flame failure must occur before causing a lockout. Most North American
codes require 1.
Index 00 = flame failures during operation
Index 01 = flame failures during main trial for ignition
0 = no repetitions
1 = no repetitions
2 = 1 repetition
3 = 2 repetitions
4 = 3 repetitions
Page 5
Description
Technical Instructions
LME-1000
PME71. PME71. PME71.
111A1 112A1 901A1
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Section 2