Siemens LME7 Series Technical Instructions page 59

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
225.00 Prepurge Time
225.01 Prepurge Multiplier
230 Pilot Stabilization Time
Pilot and Main Overlap
231
Time
232 Main Stabilization Time
234.00 Postpurge Time
234.01 Postpurge Multiplier
Air Pressure Switch
235.00
Evaluation
Response Time Air
235.01
Pressure Switch
Low Gas Pressure
236
Evaluation
237.00 POC Switch
High Gas Pressure
237.01
Switch
SCC Inc.
Default Range
13.818 sec 0-13.818 sec
29.106 sec 0-1237 sec
1 1-255
S/O
3.234 sec 0-74.97 sec
9.996 sec 0-74.97 sec
2.058 sec 2.058-74.97 sec
19.404 sec 0-1237 sec
1 1-255
1 0-1
0.294 sec 0-2.058 sec
S
0 0-1
1 0-2
S/O 0 0-1
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) along with parameter 225.01.
Sets a multiplier for the prepurge time. The actual prepurge time (length of phase 30) is determined by
multiplying parameter 225.00 and this parameter.
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. Sets the length of phase 52.
Sets the postpurge time (length of phase 74) along wth parameter 234.01.
Sets a multiplier for the postpurge time. The actual postpurge time (length of phase 74) is determined by
multiplying parameter 234.00 and this parameter.
Sets the behavior of the air pressure switch input X3-02.1.
0 = Air pressure switch is not evaluated during operation (lack of air pressure has no effect)
1 = Air pressure switch is evaluated during operation (lack of air pressure causes a lockout)
Sets the amount of time that the air pressure switch input X3-02.1 can be de-energized before a lockout
occurs. The LME7 has a base time of 0.7 seconds. This setting adds time to the base time.
Sets the behavior of the low gas pressure switch input X5-01.2.
0 = Low gas pressure switch is evaluated during startup and operation (phases 30-70).
1 = Low gas pressure switch is only evaluated when main fuel valves are open (phases 52-70). This is
useful when the low gas pressure switch is mounted downstream of the main fuel valves for CSA B149.3
compliance.
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)
PME75.811A1: Sets the function of input X2-02.4.
0 = POC
1 = high gas pressure switch
PME75.812A1: Activates or deactivates input X9-04.2 for use with a high gas pressure switch.
0 = deactivated
1 = activated
Page 5
Description
Technical Instructions
LME-1000
PME75. PME75.
811A1 812A1
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Section 4