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

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HVAC Products

5.6 Setpoints (W)

Using the AZL51..., 2 setpoints (W1 and W2) can be adjusted.
It is not possible to adjust a temperature controller setpoint higher than the current 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 predefinition 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 LMV51...).
Typically, an active PC output is connected here (PC output requires galvanic separation
for PELV).
Parameter: Inp2Config_C/V: (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 «intLC BMSan», 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.
Parameters: Inp3MinSetpoint
Inp3MaxSetpoint
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 «extLC analg», the input signal is interpreted as the predefined load.
This will internally be transmitted to FARC 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.
Basic Documentation LMV51...
5 Temperature or pressure controller (internal load controller LC)
Setpoint
max. measuring range
4
0
20
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CC1P7550en
29.05.2002