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Technical Manual – Room Temperature Controller SCN-RT1
4.5.5 Direction of controller
The following settings are available at the ETS-Software:
Figure 24: Direction of controller
The direction of the controller describes the behavior of the control value by a changing of the
control difference at rising temperature. The control value can react normal or inverted to a rising
temperature. The direction of the controller can be adjusted for all control values (PI-control
continuous, PI-control switching and 2-Step control).
An inverted control value is for adaption to normally opened valves at the 2-Step control and at the
PI-control switching.
An inverted control value means for the single control values, by controller type heating, the
following adjustments
•
PI-control continuous
The control value falls at raising regular difference and rises at falling regular difference.
•
PI-control switching
The ratio between duration of switching on to the whole PWM cycletime raise by falling
temperature and falls by raising temperature.
•
2-Step control
The controller switches on at the normal point for switching off and switches off at the
normal point for switching on.
4.5.6 Additional level
The following settings are available at the ETS-Software:
Figure 25: Additional level
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1
39
Phone: +49-2263-880 • Fax: +49-2263-4588 • knx@mdt.de • www.mdt.de
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