Siemens LMV3 series Technical Instructions page 55

LMV Series
Parameter #
Fuel 0 Fuel 1
Parameter Name
Gas Oil Gas Oil
Max Time Start
214
Release
215
Repetition SL
217
Max Time Home Run
Flame Detector
221 261 321 361
Select
222 262 322 362 Skip Prepurge
223 323
Repetition LGPS
225 265 325 365 Prepurge Time
226 - 326 -
Pre-Ignition Time
- 266 - 366
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
O 35 sec 0.2-600 sec
S 1 1-16
O 30 sec 5-600 sec
1 0-1
1 0-1
1 1-16
S
30 sec 5-3600 sec
2 sec 0.4-3600 sec
2 sec 0.6-3600 sec
On gas trains, this sets the maximum amount of time before input X5-01.2 must be energized after
receiving a call for heat. Typically a low gas pressure switch and / or other start releases are wired to input
X5-01.2 on gas trains. On oil trains, this sets the maximum amount of time before input X5-02.2 must be
energized after receiving a call for heat. Typically a high oil pressure switch and / or other start releases are
wired to input X5-02.2 on oil trains.
Sets how many times the LMV3 will attempt to restart without manual reset when the safety loop is
opened. This parameter should always be set to 1 (no repetitions). A setting of 16 indicates unlimited
repetitions.
Sets the maximum time to satisfy all conditions required in phase 10 (home run). Two of the conditions
that must be met are the air pressure switch input X3-02.1 is de-energized and the actuators have reached
their home position. On oil trains, this also sets the maximum time to satisfy the low oil pressure switch in
phase 38. The low oil switch is wired to input X9-04.2. This parameter only has effect on the low oil
pressure switch if parameter 276 (fuel 0) or 376 (fuel 1) are set to 1. If parameter 276 or 376 are set to 2,
the low oil pressure switch must be made by the beginning of safety time 1 (phase 40).
This parameter sets the type of flame scanner that is connected to the LMV3.
0 = QRB... flame scanner (Europe)
1 = QRA... flame scanner or flame rod (North America)
Activates or deactivates prepurge. It is recommended that the prepurge be activated for most burners in
North America.
0 = deactivated
1 = activated
Sets how many times the LMV3 will attempt to proceed past phase 22 if the low gas pressure switch and /
or other start releases wired to input X5-01.2 are not made. After this number of tries, a lockout will occur.
A setting of 16 indicates unlimited repetitions.
Sets the prepurge time (phase 30). Prepurge time will begin once the actuators / VSD have reached their
prepurge positions and the air pressure switch input X3-02.1 is energized.
The period of time that the ignition transformer (output X4-02.3) is energized before the pilot valve (output
X7-02.3) for piloted fuel trains. The function is similar for direct ignition fuel trains, except that the timing is
before the main valves (outputs X8-02.1 and X7-01.3) instead of the pilot valves. In summary, sets the
length of phase 38. On oil trains, this setting has no effect if parameter 281 (fuel 0) or 381 (fuel 1) is set to
1.
Page 7
Description
Technical Instructions
LV3-1000
Section 3