Siemens RDG400 manual Control outputs, 4.8.1Control output for air flow

		4.8	Control outputs
Overview of control		Different control output signals are available depending on the configuration of
outputs		thermostat via DIP switches 4 & 5, and parameters P46 & P47.
	Control output		Modulating	2-position	2-position	Modulating
	Product No.		DC 0 … 10 V	on/off	PWM	3-position
	RDG400		Y10	Y1	Y1	Y1/Y2
						(1 x / )

DC 0..10 V control signal

3-posotion control signal

Synchronization

4.8.1Control 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.

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Siemens	RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation	CE1P3182en
Building Technologies	Functions	28 May 2009