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Siemens
RDU340… Basic Documentation
CE1P3078en
Building Technologies
Functions
2014-11-03
The output signal of the air flow (DC 0..10V) can be limited to a minimum value by
using parameter P63 and to a maximum value using parameter P64. These air flow
limitation values can be set between 0% and 100%.
This is used to ensure a minimum or maximum supply air volume.
T
Room temperature
Y10
Control output
W
Room temperature setpoint
XpH
Proportional band Heating
XpC
Proportional band Cooling
Vmin
Minimum limitation air flow
Vmax
Maximum limitation air flow
The output signals DC 0…10V can be inverted by means of DIP switch #2.
– If DIP switch #2 is set to “OFF”, 0V corresponds to 0% travel and 10V to 100%
(factory settting).
– In position ON, 0V corresponds to 100% travel and 10V to 0% travel.
This function is useful in conjunction with normally open valves.
The floor temperature should be limited for 2 reasons: Comfort and protection of
the floor.
The floor temperature sensor, connected to multifunctional input X1, acquires the
floor temperature. If the floor temperature exceeds the parameterized limit
(parameter P51), the heating valve is fully closed until the floor temperature drops
to a level 2 K below the parameterized limit.
This function is factory-set to OFF (disabled).
Input X1 or X2 must be commissioned accordingly (P38 = 1).
See section 4.8“Multifunctional input”.
Living rooms:
Up to 26 °C for long-time presence, up to 28 °C for short-time presence.
Bath rooms:
Up to 28 °C for long-time presence, up to 30 °C for short-time presence.
The table below shows the relation between parameter, temperature source and
temperature display:
Parameter P51
External temp.
sensor available
Source for display of
room temperature
Output control
according to
Floor temp.
limit. function
OFF
No
Built-in sensor
Built-in sensor
Not active
OFF
Yes
External temp. sensor External temp. sensor
Not active
10...50
˚
C
No
Built-in sensor
Built-in sensor
Not active
10…50
˚
C
Yes
Built-in sensor
Built-in limit
by external sensor
Active
Output signal inversion
Floor temperature
limitation function
Recommended values
for P51:
