Siemens RDG20 KN Series Basic Documentation page 102

Functions
4
Control outputs
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)
Description
P201 = 6 6-port valve (DC 0...10 V control signal)
P201 = 7 6-port valve (DC 2...10 V control signal)
P201 = 8 inverse signal, 6-port valve (DC 10...0 V
control signal)
P201 = 9 inverse signal, 6-port valve (DC 10...2 V
control signal)
102 | 180
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].
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
N1
C1
Y1
K...
thermostat and high-
temperature cutout)
FF
F...
Explanations
Suitable for Siemens and competitor 6-port control
valves and actuators with DC 0...10 V signal
Suitable for competitor 6-port control valves and
actuators with DC 2...10 V signal (e.g. Belimo)
Useful for inversed hydraulic connection on the 6-port
control ball valve with Siemens or competitor
DC 0...10 V actuator*
Useful for inversed hydraulic connection on the 6-port
control ball valve with competitor DC 2...10 V actuator
(e.g. Belimo)*
RDG26..KN
Signal converter
SEM61.4
(see Data Sheet N5102)
Current valve SEA45.1
(see Data Sheet N4937)
Safety loop (e.g. safety
Very fast-acting fuse
Overcurrent trip
A6V11545892_en--_c