Siemens LMV3 series Technical Instructions page 58

LMV Series
Parameter #
Fuel 0 Fuel 1
Parameter Name
Gas Oil Gas Oil
244 - 344 - VP Fill Time
245 - 345 - VP Downstream Test
246 - 346 - LGPS Wait Time
- 281 - 381 Oil Ignition Start
248 284 348 384 Postpurge Time 3
- 285 - 385 Pilot LGPS
- 286 - - Start Release HO
- 287 - - Max Time SRHO
SCC Inc.
LEGEND - Password Access: U = User, S = Service, O = OEM, U/S = View - User, Write - Service, S/O = View - Service, Write - OEM
Shaded Parameters = Frequently Used. ** Parameters = Must Set. Fuel 1 parameters for LMV36 only.
U/S/O Default Range
3 sec 0.2-10 sec
O
10 sec 0.2-60 sec
10 sec 0.2-60 sec
0 0-1
1 sec 1-6480 sec
S
0 0-1
1 0-1
45 sec 1-45 sec
If valve proving is performed, this specifies the length of time that the upstream valve (V1) is energized
(output X8-02.1). This will fill the volume between the main gas valves to line pressure. Sets the length of
phase 82.
Note: The time it takes for the gas valve to be at least half open must be less than the maximum value for
this parameter.
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 LMV3 will lockout. A longer time
period will produce a more sensitive test. Sets the length of phase 83.
If there is a lack of gas pressure (low gas pressure switch is open), then the LMV3 will wait this period of
time before attempting to relight, provided that parameter 223 (fuel 0) or 323 (fuel 1) is set to a number
larger than 1 (not typically done in North America). This time period will double on each successive
attempt to relight.
On oil trains, this setting defines the point at which the ignition transformer is energized during the startup
sequence:
0 = phase 38 (short pre-ignition, use parameter 266 or 366 to set the length of time)
1 = phase 22 (long pre-ignition)
This setting defines the optional postpurge time. If a call for heat exists during this time, the LMV3 stops
postpurging immediately and goes directly to standby. Once the air pressure switch is proven open and the
actuators reach their home positions, the burner will startup provided a call for heat still exists. See
parameter 234/274/334/374 for information on the mandatory postpurge time. Sets the maximum length
of phase 78.
Parameter only exists on an LMV36: On oil trains with a gas pilot, this setting defines whether or not a low
gas pressure switch is connected to input X5-01.2. If set to 0, input X5-01.2 is ignored on oil. If set to 1,
input X5-01.2 must be energized by the end of phase 38.
0 = low gas pressure switch not connected
1 = low gas pressure switch connected
Parameter only exists on an LMV37: When running heavy oil, this setting defines the point in the startup
sequence when the start release for heavy oil (input X9-04.2) must be energized.
0 = only in phase 38
1 = phase 38-62
Parameter only exists on an LMV37: When running heavy oil, this sets the maximum time to satisfy the
heavy oil start release in phase 38. The heavy oil start release is wired to input X9-04.2. After this period of
time, the LMV3 will either lockout or attempt to light-off again depending on the setting of parameter 195.
Page 10
Description
Technical Instructions
LV3-1000
Section 3