Technical Manual
Glass Room Temperature Controller Smart SCN-RTRGx.02
MDT technologies GmbH •
51766 Engelskirchen • Papiermühle 1
•
Germany
Phone: +49-2263-
880 • [email protected] • www.mdt.de
63
63
4.4.4.4 Direction of controller
The direction of controller describes the response of the control value to a change in the system
deviation as the temperature rises. The control value can exhibit normal control response to a rising
temperature or inverted control response. The direction of action is available for all settings of the
control value (PI control; PWM; 2-step).
In PWM and 2-step control, an inverted control value is used for adaptation to valves that are open
when no current is applied.
For the individual controllers, an inverted correcting variable, here in the example for operating
mode “Heating”, means:
•
PI-controller
The control value decreases with increasing system deviation and increases with
decreasing system deviation.
•
PWM-controller
The ratio of the duty cycle to the total PWM cycle increases with rising temperature and
decreases with falling temperature.
•
2-step-controller
The controller switches itself on at the actual switch-off point and off at the actual switch-
on point.
4.4.4.5 Additional settings for Heating & Cooling mode
The picture shows the additional settings in “Heating and Cooling” mode:
Figure 29: Additional settings
–
Heating and Cooling
The following table shows the additional settings in the "Heating and Cooling" operating mode:
ETS-Text
Dynamic range
[Default value]
Comment
System
▪
2 pipe / 1 circuit
(Heating or Cooling)
▪
4 pipe / 2 circuit
(H Cooling
simultaneously)
Setting for separate or combined heating /
cooling circuits.
Switchover
Heating/Cooling
▪
automatically
▪
via object
Setting whether the switchover is carried
out automatically via the temperature or
via a separate object.
Only with controller setting "
Setpoints -
dependent on setpoint Comfort (Basic)”.
via object
Fixed text, not changeable.
Only with controller setting "
Setpoints -
independent setpoints
".
Table 66: Additional settings
–
Heating and Cooling
