Siemens LME7 Series Technical Instructions page 58

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
179 Two Flame Sensor Logic
180 Self-Check Time
212 Max Time Low Fire
Extraneous Light
216
Tolerance Time
Flame On Response
217.00
Time
Flame Failure Response
217.01 Time
(FFRT)
Forced Intermittent
218
Time
222 Prepurge Activation
Low Gas Pressure
223
Shutdown Behavior
SCC Inc.
Default Range
0 0-1
S/O
0 0-1
58.212 sec 0-1237 sec
S
29.106 sec 0-1237 sec
Read only
1.911 sec 0-13.818 sec
S/O
80050.31 sec 0-80050.31 sec
1 0-1
S
1 0-1
The LME75 allows the use of two flame sensors at the same time (one flame rod and one flame scanner).
This sets the logic for the flame sensor inputs.
0 = OR logic - a valid flame signal must be present on one of the two flame signal inputs. This applies from
the end of phase 42 through the end of burner operation.
1 = AND logic - a valid flame signal must be present on both flame signal inputs. This only applies from the
start of phase 52 through the end of operation. During phases 42-50, only one flame signal must be
present.
Sets the time interval for the test of the self-check scanner. On the QRA75... scanner, this sets the length
of time between shutter operations.
0 = every 5 minutes
1 = every 5 seconds
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.
This sets the amount of time that a flame signal must be present in standby before the LME7 goes into
lockout (Loc 4). When a flame signal is present during standby, the LME7 immediately goes to Phase 04.
If the flame signal goes away before this time elapses, the LME7 will switch from Phase 04 back to standby
(OFF) without requiring a manual reset.
Sets the amount of time that a flame signal must be present before the LME7 considers that flame signal
to be valid. This parameter has no effect as the value is set to 0 seconds.
Sets the flame failure response time (FFRT). The FFRT is the maximum length of time that the flame
signal can go away before a lockout occurs. The LME75 has a base flame failure response time of 1
second. This setting adds time to the base time. For example, the default setting of 1.911 seconds means
the FFRT is 2.911 seconds.
Sets the length of time before a forced burner shutdown occurs. If the burner has been running
uninterrupted for this length of time, and parameter 239 is set to 1, the burner will shut down and
automatically restart afterwards. The purpose of the shutdown is to check and cycle safety devices.
Activates or deactivates prepurge after a normal shutdown. If this is set to 0, a prepurge will still occur on
the next startup following a lockout or a loss of power, or if valve proving is activated and occurs during
startup.
0 = deactivated
1 = activated
Sets the behavior of the LME7 in the event that the low gas pressure switch connected to input X5-01.2 is
de-energized.
0 = safety shutdown and start prevention - the burner is shutdown and the LME7 goes into Phase 90 until
gas pressure is restored. Once gas pressure is restored, the burner will start back up automatically.
1 = lockout (Loc 20)
Page 4
Description
Technical Instructions
LME-1000
PME75. PME75.
811A1 812A1
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Section 4