Siemens RDG200KN, Basic Documentation, Page: 80 / 150

Functions
Control outputs
4
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As initial setting, we suggest the following values, which can be modified within the
described setting range as needed:
● Electric heater applications: 300 s (5 min) / range 30...60 s
● Electric radiator applications: 1200 s (20 min) / range 120...1800 s (30 min)
● Electric floor heating: 1200 s (20 min) / range 30...1800 s (30 min)
If output Y2 controls one external solid state relay:
● Electric heater applications: 60 s / range 15...60 s
● Electric radiator applications: 300 s (5 min) / range 30...300 s (5 min)
● Electric floor heating: 600 s (10 min) / range 30...900 s (15 min)
To avoid burn-off of mechanical contacts by frequent switching, use a current valve
in place of a relay or contactor.
To avoid possible supply problems, when many consumers are switching on at the
same time in a building, consider the following:
● Set slightly different PMW cycles
● Do not switch all rooms to Comfort at the same time
This function is available with RDG260KN only.
The demand calculated by PI control from the current room temperature and
setpoint is provided via Y10 and Y20 to the valve actuator as a continuous
DC 0...10 V signal.
● Parameter P256 (RDG260KN) sets the heating flow limitation if PICV is
installed at output Y10 for heating and cooling. See Additional functions [ ➙ 42].
● For P-band (P050, P052, P054), see Control sequences [ ➙ 56].
● The demand calculated by PI control from the current room temperature and
setpoint is provided via Y20 as a continuous DC 0...10 V signal
● The signal converter (SEM61.4) converts the DC 0...10 V signal to AC 24 V
PDM pulses for the current valve
● The current valve (SEA45.1) supplies the electric heater with pulsed current
The electric heater can be controlled via the On/Off control output (Q2) by setting
P203 or P204 to 4. For adaptive temperature compensation, see 2-pipe fan coil
unit with electric heater [ ➙ 60].
N1 RDG260KN
C1 Signal converter
SEM61.4
(see Data Sheet N5102)
Y1 Current valve SEA45.1
(see Data Sheet N4937)
K… Safety loop (e.g. safety
thermostat and
high-temperature
cutout)
FF Very fast-acting fuse
F… Overcurrent trip
The RDG260KN can control a 6-port control ball valve that provides heating and
cooling within one DC 0…10 V or DC 2…10 V signal.
Note
DC 0...10 V control
DC 0...10 V
for valve actuators
Note
DC 0...10 V
for electric heaters
Note
DC 0...10 V
DC 2…10 V
for 6-port control ball valve
(RDG260KN only)