Siemens RDG2 KN Series Basic Documentation

Functions
Control outputs
4
102 | 180
A6V11545892_en--_c
The demand calculated by PI control from the current room temperature and
setpoint is provided via Y10, Y20, Y30 and U1 (U1, for 4-pipe/2-stage applications)
to the valve actuator as a continuous DC 0...10 V signal.
● Parameter P256 (RDG26..KN) sets the heating flow limitation if PICV is
installed at output for heating and cooling. See Additional functions [➙ 47].
● For P-band (P050, P052, P054), see Control sequences [➙ 75].
● 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 [➙ 79].
N1 RDG26..KN
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 RDG26..KN 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.
These 2 signals allow for controlling Siemens valves as well as DC 2…10 V valves
by other suppliers.
For the same application, RDG26..KN can also provide an inverse signal
DC 10…0 V or DC 10…2 V signal for inversed hydraulic connections on the valve.
The selection of the signal is set with P201.
* Inverting the signal might cause hydraulic balancing issues
Description
Explanations
P201 = 6
6-port valve (DC 0…10 V control signal)
Suitable for Siemens and competitor 6-port control
valves and actuators with DC 0…10 V signal
P201 = 7
6-port valve (DC 2…10 V control signal)
Suitable for competitor 6-port control valves and
actuators with DC 2…10 V signal (e.g. Belimo)
P201 = 8
inverse signal, 6-port valve (DC 10…0 V
control signal)
Useful for inversed hydraulic connection on the 6-port
control ball valve with Siemens or competitor
DC 0…10 V actuator*
P201 = 9
inverse signal, 6-port valve (DC 10…2 V
control signal)
Useful for inversed hydraulic connection on the 6-port
control ball valve with competitor DC 2…10 V actuator
(e.g. Belimo)*
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
(RDG26..KN only)

Siemens RDG2 KN Series Specifications

General

Brand	Siemens
Model	RDG2 KN Series
Category	Thermostat
Language	English