Siemens LME7 Series Technical Instructions

LME Series
Technical Instructions
LME-1000
PW Level Default Range Description
Parameter
Number
PME75.
811A1
PME75.
812A1
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
239 Forced Intermittent S/O 0 0-1
When activated, this forces the LME7 to shut the burner down after a predetermined length of
uninterrupted operation. This length of time is set by parameter 218. 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
• •
241 Valve Proving Activation 1 0-1
This setting determines if gas valve proving (leak testing) will be performed. Gas valve proving is
performed during shutdown unless the postpurge time (parameter 234.00) is set to 0. In that case, valve
proving occurs during startup.
0 = deactivated
1 = activated
•
242 VP Evacuation Time 2.646 sec 0-2.646 sec
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.
•
243 VP Upstream Test 10.290 sec 1.029-37.485 sec
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.
•
244 VP Fill Time 2.646 sec 0-2.646 sec
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.
•
245 VP Downstream Test 10.290 sec 1.029-37.485 sec
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.
•
247 Intermittent Pilot 0 0-1
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 (oP…).
0 = interrupted pilot
1 = intermittent pilot
• •
257 Trial for Ignition 4.116 sec 0-13.23 sec
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. The LME7 has a base time of 0.3 seconds. This setting adds seconds to the base time. Sets the
length of phase 40.
• •
259 Actuator Opening Time 58.212 sec 0-1237 sec Set slightly longer than the time it takes for the actuator to drive from fully closed to fully open.
• •
260
Actuator Closing
Time
58.212 sec 0-1237 sec Set slightly longer than the time it takes for the actuator to drive from fully open to fully closed.
• •
S/O
S
SCC Inc. Page 6 Section 4

Siemens LME7 Series Specifications

General

Brand	Siemens
Model	LME7 Series
Category	Controller
Language	English