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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 >
Configuration
Operating line
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.
Notes
"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.
Application 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]
31
23
D
11
20
40
60
80
120
0
20
2
1
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.
141 / 216
Siemens
Switching and monitoring device RMS705B
CE1P3124en
Building Technologies
H/C demand, H/C changeover
01.04.2010