Siemens RVA63.242 - Page 143

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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
4.78.4 Heat demand DC 0...10 V
External consumers can transmit a demand for heat in the form of an analog signal of
DC 0...10 V. The controller converts this voltage signal to a temperature setpoint of
0...130 °C and considers this value when generating the setpoint of boiler temperature
control.
[v]
0
2
4
6
8
10
10
20
30
40
50
60
70
80
90
100
110
120
130
[°c]
2379Z26
T = 130°C
T = 50°C T = 70°C T = 90°C
T = 110°C
S = 5°C
T = maximum value of heat demand
S = minimum limitation of heat demand = 5 °C
The setpoint for 10 V can be set with parameter “Maximum value of heat demand”
(operating line 172, setting range 5...130 °C). The voltage corresponding to the
displayed temperature can then be calculated as follows:
C][ demand" heat of value Maximum"
C]
[
e"
temperatur
actual
"
*
[V]
10
[V]
°
°
=