User Manual
10.1.7 Heat demand continuous ( )
In addition to the heat demand relay, heat demand can be provided at a continuous
output of other devices. You can set the characteristic of the continuous 0….10 V
signal.
Purpose
Main menu > Commissioning > Extra configuration > Aggregates > Heat demand >
Config
uration
Operating lin
e Adjustable values / Comment
Heat demand modulating ---, N.Y1, N.Y2, ... / Enable output.
Main menu > Settings > Aggregates > Heat demand >
Setting values
Operating line Range Factory setting
Setpoint at 0 Volt –50 °C…Setpoint at 10 Volt 0 °C
Setpoint at 10 Volt Setpoint at 0 Volt…250 °C 100 °C
Limit value
Setpoint at 0 Volt…
Setpoint at 10 Volt
10 °C
"Setpoint at 0 Volt" determines the flow temperature setpoint at DC 0 V.
Note
s
"Setpoint at 10 Volt" determines the flow temperature setpoint at DC 10 V.
"Limit value" means limit value for heat demand: Temperatures below this level
are interpreted as "no heat demand".
Output signal DC 0 V is sent as long as the flow temperature setpoint does not
exceed the set limit value. When the limit value is exceeded, the relevant output
signal is sent until the setpoint is again below the limit value minus a 0.5 K
hysteresis.
– Output signal Y (DC 0…10 V) for heat demand corresponds to a flow
temperature setpoint range of 0…120 °C. This limit value should be at 10 °C.
Applicatio
n example
– The heating flow setpoint may float between 60…90 °C depending on demand.
– An output signal corresponding to the set characteristic is to be issued at output
Y.
DC 0...10 V output is only a continuous signal if "Flow temperature reduction max"
> 0 is set.
Note
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]
3123D11
20 40 60 80 1200
20
21 3
w
TV
4
5
6
Setpoint in °C at DC 0 V.
Setpoint in °C at DC 10 V.
Limit value.
Heating flow setpoint = 90 °C.
Flow temperature reduction max,
here 30 K.
Shifting range for output signal.
w
TV
: Current flow temperature setpoint.
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Siemens Switching and monitoring device RMS705B CE1P3124en
Building Technologies H/C demand, H/C changeover 01.04.2010