Control Outputs; Overview; Control Output For Air Flow - Siemens RDG400KN Basic Documentation

Control output Modulating
DC 0...10 V
Product No.
RDG400KN Y10
RDG405KN
DC 0...10 V
control signal
3-position
control signal
Control signal
(KNX LTE mode only)
Synchronization
Note
Siemens
Building Technologies
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.
2-position
On/Off
1)
Y1
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 extended + 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.
RDG400KN,RGD405KN Basic documentation
2-position Modulating
PWM 3-position
1) 1)
Y1 Y1/Y2
(1 x /
Modulating
KNX
KNX LTE-Mode
)
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CE1P3192en
2017-02-17