SAUTER flexotron®400 - RDT410
Control modes
P100012103
18
5.1.1
Control mode 4, Radiator circuit control with outdoor curve
For this control mo
de you need two sensors, GT1 “Supply temperature” on AI1
and GT2 “Outdoor sensor” on AI2.
You can also have a room temperature sensor on UI1 to let the room
temperature offset give correction to the supply temperature. Wire UI1 as an
analogue input. When using a room sensor, it is possible to set the room setpoint
via an external Ni1000 setpoint device.
3-position control
Instead of the analogue output you can configure a 3-position (increase /
decrease) output using DO1 and DO2. DO1 is used for increase signal and DO2
for decrease. This option cannot be combined with alarm output.
A single PI control loop is used.
The RDT410F301 generates 24V AC itself for control of 3-position actuators. 230
V actuators cannot be used without relays.
Control curve
The supply temperature setpoint is determined by a outdoor temperature/supply
temperature curve. The basic control curve is a straight line between the two
setpoints SP
L
and SP
H
where SP
L
is the supply temperature to be held when the
outdoor temperature is +20°C and SP
H
is the temperature to be held at an
outdoor temperature of -20°C. An extra temperature boost can be added at 0°C
outdoor temperature. The boost receeds from the set value to 0 over ±3 degrees.
In the Setpoint menu a parallel displacement of the whole curve can be added.
Supply temp
Outdoor temp
SP
H
SP
L
-20
0
+20
Room temperature sensor(s)
An optional room sensor can be connected to UI1. If a room sensor is used, it
must be connected to the RDT410 before control mode 4 is selected. Otherwise,
the controller will not detect the sensor. To activate/deactivate the room sensor it
has to be connected/not connected to the RDT410 before control mode 4 is
selected. The control program is automatically adapted when a room sensor is
connected. Deviation of the set room temperature is corrected by
increasing/decreasing the supply temperature by 3°C per one degree of
deviation.
If room sensor is activated the Setpoint menu is used to set the room
temperature instead of adding a parallel displacement.
