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Siemens
RDG400KN,RGD405KN Basic documentation
CE1P3192en
Building Technologies
2017-02-17
3.7 Control
outputs
3.7.1 Overview
Different control output signals are available depending on the configuration of the
thermostat via DIP switches 4 and 5, and P46 and P47.
Control output
Product No.
Modulating
DC 0…10 V
2-position
On/Off
2-position
PWM
Modulating
3-position
Modulating
KNX
RDG400KN
RDG405KN
Y10
Y1
1)
Y1
1)
Y1/Y2
1)
(1 x
/
)
KNX LTE-Mode
1) Either On/Off, PWM or 3-position (triac)
For configuration of the control outputs, refer to section 3.7.4.
3.7.2 Control output for air flow
The demand calculated by PI control from the current room temperature and the
setpoint is delivered to the damper actuator as a modulating DC 0...10 V signal via
output Y10.
A 3-position control output for an air damper has 2 control signals, one for the
Open
command and one for the
Close
command. The thermostat features an
internal stroke model to calculate the position of the actuator. Therefore, the
running time from the fully closed to the fully open position must be adjusted via
P44 (from 20 to 300 seconds; factory setting is 150 seconds).
A VAV compact controller receives its control signal via KNX bus.
For communication settings (geographical zone, air distribution zone), refer to
sections 3.10.3 and 3.10.13.
On single-duct applications, a closing synchronization is effected to readjust the
internal stroke model to the real position of the actuator.
1. When the thermostat starts up, a closing signal (actuator running time + 150%
= 2.5 x running time) is delivered to ensure the actuator will be fully closed
and synchronized with the control algorithm.
2. Each time the thermostat calculates the fully closed position, the actuator’s
running time is ex 150% to ensure the corrrect position of the
actuator.
3. When the actuator reaches the position calculated by the thermostat, a
waiting time of 30 seconds is observed to stabilize the outputs.
"Opening" synchronization is available for valve outputs only.
DC 0...10 V
control signal
3-position
control signal
Control signal
(KNX LTE mode only)
Synchronization
Note