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Siemens
Central control unit RMB795B
CE1P3122en
Building Technologies
Distribution zones
18.01.2012
11.3.3 Heat demand modulating
In addition to the heat demand relay, the heat demand can be made available at a
modulating output N.Yx for other devices.
Main menu > Commissioning > Extra configuration > Heat demand
Operating line
Adjustable values / remarks
Heat demand
modulating
---, N.Y1, N.Y2, ...
Activate output.
Main menu > Settings > Heat demand >
Operating line
Range
Factory setting
Setpoint at 0 V
–50…+50 °C
0 °C
Setpoint at 10 V
50…500 °C
100 °C
Limit value
–50…+250 °C
10 °C
"Setpoint at 0 V" determines the flow temperature setpoint at DC 0 V.
"Setpoint at 10 V" determines the flow temperature setpoint at DC 10 V.
"Limit value" denotes "Limit value for heat demand": Temperatures below this level
are interpreted as "no heat demand".
As long as the flow temperature setpoint does not exceed the set limit value, the
output signal DC 0 V is sent. When the limit value is exceeded, the relevant output
signal is sent until the setpoint is again below the limit value minus a hysteresis of
0.5 K.
Output signal Y (DC 0…10 V) for the heat demand corresponds to a flow
temperature setpoint range w
TV
of 0…120 °C. This limit value should be at 10 °C.
The diagram shows the values of the parameters to be set and the resulting
progression of the heat demand signal:
100
0
10
Y
[ V ]
[°C]
31
21
D
02
20
40
60
80
120
0
−
20
2
1
3
w
TV
1 Setpoint in °C at DC 0 V.
here 0 °C (factory setting)
2 Setpoint in °C at DC 10 V.
here 120 °C
3 Limit value for heat demand
here 10 °C (factory setting)
Purpose
Configuration
Setting values
Explanations relating to
the setting values
Diagram relating to the
setting values (example)
Key
