Siemens LMV 5 Series, Technical Instructions, Page: 141 / 374

LMV Series Technical Instructions
Document No. LV5 ‐ 1000
SCC Inc. Page 23 Section 4
Most boilers use load controller mode "IntLC" which utilizes the local temperature / pressure sensor and
a local setpoint entered through the AZL display. The following procedure outlines how to set up this
mode:
1.
If possible, shut off the burner switch. Let the burner get back to Phase 12 (standby).
2.
Verify that the load controller is in the correct mode through the following menu path:
Params & Display > LoadController > Configuration
Set parameter LC_OptgMode to "IntLC". Next, verify that the connected pressure or
temperature sensor is configured correctly. In the same menu, set Sensor Select to
“PressSensor” for a steam boiler or to the appropriate temperature sensor for a hot water
boiler.
3.
If a pressure sensor was selected, two additional parameters must be set in the same menu. Set
parameter Ext Inp X61 U/I to match the pressure sensor wired into the X61 terminal. Typically
this will be 0 ‐ 10VDC or 4 ‐ 20mA and will be printed on the side of the sensor. Next, set
parameter MRange PressSens to the high range of the pressure sensor. This is typically printed
on the side of the pressure sensor.
4.
Configure setpoint W1 (the local setpoint) through the following menu path:
Operation > BoilerSetpoint
5.
Set the turn ‐ on point ( SD_ModOn ) and the turn ‐ off point ( SD_ModOff ) for the boiler. These are
percentages based on the current setpoint (W1). The menu path for these parameters is:
Params & Display > LoadController > ControllerParam
Typically, the burner is shut off 10% over setpoint and turned back on 1% above setpoint.
NOTE: Other pressure / temperature controls or limits on the boiler must be set above the
SD_ModOff pressure / temperature.
NOTE: SD_ModOff and SD_ModOn are only valid for internal load controller modes. If the
LMV5 is in an external load controller mode, SD_ModOff and SD_ModOn are ignored.
6.
If it is safe to do so, turn on the burner switch. If thermal shock is a concern, allow the boiler to
warm. The burner can be put in manual and held at low fire if necessary through the Manual
Operation menu.
7.
Once the boiler is up to pressure / temperature, is modulating, and is carrying normal load,
adjust the PID values through the following menu path:
Params & Display > LoadController > ControllerParam > ContrlParamList
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