Heat Demand Modulating - Siemens RMB795B Basic Documentation

Purpose
Configuration
Setting values
Explanations relating to
the setting values
Diagram relating to the
setting values (example)
Key
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Siemens
Building Technologies

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
Heat demand
modulating
Main menu > Settings > Heat demand >
Operating line
Setpoint at 0 V
Setpoint at 10 V
Limit value
"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
The diagram shows the values of the parameters to be set and the resulting
progression of the heat demand signal:
Y [ V ]
3
10
1
0
−20 0 20 40 60
1
Setpoint in °C at DC 0 V.
2
Setpoint in °C at DC 10 V.
3
Limit value for heat demand
Central control unit RMB795B
Distribution zones
Adjustable values / remarks
---, N.Y1, N.Y2, ...
Activate output.
Range
–50...+50 °C
50...500 °C
–50...+250 °C
of 0...120 °C. This limit value should be at 10 °C.
TV
2
w
TV
[°C]
80 100 120
here 0 °C (factory setting)
here 120 °C
here 10 °C (factory setting)
Factory setting
0 °C
100 °C
10 °C
CE1P3122en
18.01.2012