Siemens LME7 Series Technical Instructions page 30

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
Valve Proving
241.00
Activation
241.01 Valve Proving Setup 1
241.02 Valve Proving Setup 2
242 VP Evacuation Time
243 VP Upstream Test
244 VP Fill Time
245 VP Downstream Test
247 Intermittent Pilot
Flame Failure Response
254 Time
(FFRT)
257 Trial for Ignition
SCC Inc.
Default Range
0 0-1
1 0-1
0 0-1
2.646 sec 0-2.646 sec
10.290 sec 1.029-37.485 sec
S/O
2.646 sec 0-2.646 sec
10.290 sec 1.029-37.485 sec
0 0-1
1 0-1
111 - 4.116 sec
112 - 4.116 sec 0-13.23 sec
901 - 2.205 sec
This setting determines if gas valve proving (leak testing) will be performed. Gas valve proving can be
performed on startup, shutdown, or both depending on the settings of parameters 241.01 and 241.02.
0 = deactivated
1 = activated
Determines at which point during the burner's sequence that valve proving will be performed. Used in
conjunction with parameter 241.02.
0 = valve proving on startup
1 = valve proving on shutdown
Determines at which point during the burner's sequence that valve proving will be performed. Used in
conjunction with parameter 241.01.
0 = valve proving according to parameter 241.01
1 = valve proving on startup and shutdown
If valve proving is performed, this specifies the length of time that the downstream valve (V2) is energized
(output X7-01.3). This will evacuate any gas that might exist between the gas valves. Sets the length of
phase 80.
If valve proving is performed, this specifies the length of time that both the upstream and downstream
valves are closed. If the pressure between the valves rises during this period (enough to open the NC
valve proving pressure switch), then the upstream valve is leaking and the LME7 will lockout. A longer
time period will produce a more sensitive test. Sets the length of phase 81.
If valve proving is performed, this specifies the length of time that the upstream valve (V1) is energized
(output X7-04.4). This will fill the volume between the main gas valves to line pressure. Sets the length of
phase 82.
If valve proving is performed, this specifies the length of time that both the upstream and downstream
valves are closed. If the pressure between the valves falls during this period (enough to close the NC valve
proving pressure switch), then the downstream valve is leaking and the LME7 will lockout. A longer time
period will produce a more sensitive test. Sets the length of phase 83.
Sets the type of pilot being used. If set to 1, the pilot valve will remain open from phase 40 to the end of
main operation (oP1).
0 = interrupted pilot
1 = intermittent pilot
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. This setting also doubles as the length of time the signal from the air
pressure switch can go away before a lockout occurs. On PME71.901A1, the FFRT is fixed at 1 second.
0 = 1 second
1 = 3 seconds
On PME71.111A1 and PME71.112A1, this setting defines the overlap of the spark (output X4-02.3) and the
pilot valve (output X7-01.3) if a pilot is used.
On PME71.901A1, this setting defines the overlap of the spark (output X4-02.3) and the main valves.
After this time expires, the spark is de-energized. The LME7 has a base time of 0.3 seconds. This setting
adds seconds to the base time. Sets the length of phase 40.
Page 6
Description
Technical Instructions
LME-1000
PME71. PME71. PME71.
111A1 112A1 901A1
•
•
•
•
•
•
•
• •
• •
• • •
Section 2