Siemens LME7 Series Technical Instructions page 45

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
212 Max Time Low Fire
Time Air Pressure
224
Switch
225 Prepurge Time
226 Pre-Ignition Time
230 Pilot Stabilization Time
Pilot and Main Overlap
231
Time
232 Main Stabilization Time
234 Postpurge Time
237 POC Switch
239 Forced Intermittent
240 Repetition Flame
SCC Inc.
Default Range
S 58.212 sec 0-1237 sec
13.818 sec 0-13.818 sec
29.106 sec 0-1237 sec
6.174 sec 1.029-37.485 sec
811 - 3.234 sec
812 - 3.234 sec 3.234-74.97 sec
S/O
840 - 9.408 sec
811 - 9.996 sec
812 - 9.996 sec 0-74.97 sec
840 - 2.646 sec
811 - 2.058 sec
812 - 2.058 sec 2.058-74.97 sec
840 - 8.820 sec
19.404 sec 0-1237 sec
S 1 0-2
0 0-1
S/O
0 0-4
200 Level: Burner Control
Sets the maximum time to let the LME7 drive the actuator to low fire before shutting the fuel valves after
a call for heat has been removed from X5-03.1. This setting does not affect fuel valve closing time in the
event of a safety shutdown.
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 pilot valves are
opened. Sets the length of phase 38.
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. 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. After this time expires, the pilot is de-energized. Sets the length of phase 50.
This setting defines the main stabilizing period if a pilot is used. During this period, only the main valve is
open. The pilot valve is de-energized. "oP1" will be displayed during this time.
Sets the postpurge time (length of phase 74).
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 verify POC switch is open during
main 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.
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 (no repetitions).
0 = no repetitions
1 = no repetitions
2 = 1 repetition
3 = 2 repetitions
4 = 3 repetitions
Page 5
Description
Technical Instructions
LME-1000
PME73. PME73. PME73.
811A1 812A1 840A1
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Section 3