Siemens LMV52 series User Manual

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Building Technologies Basic Documentation LMV5... CC1P7550en
7 Boiler controller / load controller 22.05.2018
If parameterized for Int LC X62, the input signal is converted to pressure or temperature
according to the parameterization of the measuring range and interpreted as the boiler’s
setpoint. The setting range automatically corresponds to the parameterized measuring
range of the actual value and can also be limited.
Setpoint
min. measuring range
Setpoint
max. measuring range
I (mA) 0 / 4 20
U (V) 0 / 2 10
The detection of short-circuits and line interruptions is ensured – similar to the sensor
inputs (but not when configured for DC 0...10 V / 0…20 mA). The request for heat
results from the difference of actual value and setpoint.
Parameter Ext MinSetpoint
Ext MaxSetpoint
Example: DC 0...10 V or 4...20 mA with MRange TempSens = 150 °C
Setting parameter Ext MinSetpoint = 33%
Setting parameter Ext MaxSetpoint = 80%
0 °C
Example
External
setpoint-min
External
setpoint-max
Figure 59: Setpoints
If parameterized for Ext LC X62, the input signal is interpreted as the predefined load.
This is internally transmitted to the fuel-air ratio control system where it is translated
into the respective actuator driving signals. Since the internal controller is inactive in
this operating mode, control must be performed externally. If, in addition, a temperature
sensor Pt100 (and/or Pt1000, LG-Ni1000 sensor) is connected, it is also possible to
use the internal temperature limiter function with the external predefined load.
Low-fire Nominal load
I (mA) 0 / 4 20
U (V) 0 / 2 10
External predefined
setpoint
External predefined load
External predefined
load, modulating

Siemens LMV52 series Specifications

General

Brand	Siemens
Model	LMV52 series
Category	Control Unit
Language	English