Siemens LME7 Series Technical Instructions

LME Series
Technical Instructions
LME-1000
PW Level Default Range Description
Parameter
Number
PME73.
811A1
PME73.
812A1
PME73.
840A1
LEGEND - Password Level: S = Service; O = OEM; S/O = View - Service, Write - OEM; Info = Info Menu; Ser = Service Menu
Shaded Parameters = Frequently Used
Parameter Name
212 Max Time Low Fire S 58.212 sec 0-1237 sec
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.
• •
224
Time Air Pressure
Switch
13.818 sec 0-13.818 sec
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.
•
225 Prepurge Time 29.106 sec 0-1237 sec
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.
• • •
226 Pre-Ignition Time 6.174 sec 1.029-37.485 sec
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.
•
230 Pilot Stabilization Time
811 - 3.234 sec
812 - 3.234 sec
840 - 9.408 sec
3.234-74.97 sec
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.
• • •
231
Pilot and Main Overlap
Time
811 - 9.996 sec
812 - 9.996 sec
840 - 2.646 sec
0-74.97 sec
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.
• • •
232 Main Stabilization Time
811 - 2.058 sec
812 - 2.058 sec
840 - 8.820 sec
2.058-74.97 sec
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.
• • •
234 Postpurge Time 19.404 sec 0-1237 sec Sets the postpurge time (length of phase 74).
• • •
237 POC Switch S 1 0-2
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)
• •
239 Forced Intermittent 0 0-1
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
• •
240 Repetition Flame 0 0-4
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
• • •
200 Level: Burner Control
S/O
S/O
SCC Inc. Page 5 Section 3

Siemens LME7 Series Specifications

General

Brand	Siemens
Model	LME7 Series
Category	Controller
Language	English