Control Outputs; Control Output For Air Flow - Siemens RDG400 Basic Documentation

Overview of control
outputs
Control output
Product No.
RDG400
DC 0..10 V
control signal
3-posotion
control signal
Synchronization
Siemens
Building Technologies
4.8

Control outputs

Different control output signals are available depending on the configuration of
thermostat via DIP switches 4 & 5, and parameters P46 & P47.
Modulating
DC 0 ... 10 V
Y10
4.8.1

Control output for air flow

The demand calculated by the PI control from the current room temperature and
setpoint is provided to the valve actuator as a continuous DC 0...10 V signal via
output Y10.
A 3-position control output for a damper has 2 control signals, one for the "opening"
command and one for the "closing" command. The thermostat has an internal
stroke model to calculate the position of the actuator. Therefore the running time
from the fully closed to the fully open position has to be adjusted via parameter P44
(from 20...300sec; factory setting is 150 seconds).
In single-duct applications, a closing synchronization is done to readjust the
internal stroke model to the real position of the actuator.
1. When the controller 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 controller calculates the position fully closed, the actuator's
running time is extended + 150% to ensure the right position of the actuator.
3. When the actuator has reached the position calculated by the controller, a
waiting time of 30 seconds is observed in order to stabilize the outputs.
Note: opening synchronization is available for valve outputs only.
RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation
Functions
2-position 2-position
on/off PWM
Y1 Y1
Modulating
3-position
Y1/Y2
(1 x / )
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CE1P3182en
28 May 2009