Setpoints (W); Internal Setpoint; Input 3: Set Point Input X62; External Predefined Setpoint - Siemens LMV51 Series Basic Documentation

Internal setpoint

Input 3: SET POINT
INPUT
X62
External predefined
setpoint

External predefined load

External predefined
load, modulating
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6.6 Setpoints (W)

Using the AZL5..., 2 setpoints (W1 and W2) can be adjusted. It is not possible to adjust
a temperature controller setpoint higher than the actual limit value of the integrated TL
function. The setting range automatically corresponds to the parameterized measuring
range of the actual value. Changeover between W1 and W2 can be accomplished by
means of an external (potentialfree) contact connected to input 3 (X62), «External pre-
definition of setpoint / load». W1 is active as standard (contact open).
Parameters:
SetpointW1
SetpointW2
Input for an external predefined setpoint, suited for a predefined load or setpoint
changeover. The input is passive (not powered by the LMV5...). Typically, an active PC
output is connected here (PC output requires galvanic separation for PELV).
Parameter:
Ext Inp X62 U/I: (4...20 mA / 0/2...10V)
When setting is (0/2...10 V),
the setting ranges are as follows
• DC 2...10 V with external predefined load
• DC 0...10 V with external predefined setpoint
If parameterized for «Int LC X62», the input signal is converted to pressure or tempera-
ture 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.
Parameters:
Ext Setpoint min
Ext Setpoint max
Setpoint
min. measuring range
I (mA)
U (V)
Detection of short-circuits and open-circuits of lines is ensured - similar to the sensor
inputs (but not when configured for DC 0...10 V). The demand for heat results from the
difference between actual value and setpoint.
If parameterized for «Ext LC X62», the input signal is interpreted as the predefined load.
This will internally be transmitted to FARC where it is translated into the respective ac-
tuator 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-Ni 1000 sensor) is connected, it is also possible to use the internal tem-
perature limiter function with the external predefined load.
Part load
I (mA) 4
U (V) 2
Basic Documentation LMV5...
6 Temperature or pressure controller (internal load controller LC)
Setpoint
max. measuring range
4
0
Full load
20
10
20
10
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CC1P7550en
13.08.2004