9.4 Changeover
9.4.1 Activating the controller with changeover
The following example shows a changeover plant with supply area, precontrol and
room temperature control. The RLU2…(U) precontroller and RLU2…(A) room
temperature controller are indicated.
Plant principle
T
T
RLU2...(U)
3101S31
T
T
T
T
RLU2...(A)
You can activate this control function for all universal controllers, i.e. for RLU202,
RLU220, RLU222, RLU232 and RLU236 in basic type U.
Activating the RLU2…
(U) primary pre-
controller
Apply the following procedure to activate the respective controller:
• Assign one Xx input each to the main controlled variable (MAIN) at the
CTLOOPx controller block and to the CH OVER input at the MODE function
block
• Set the identifier of the main controlled variable MAIN to TEMP
In that case, the “Changeover” function always acts only on controller 1 and the
activated sequences. The universal controller comes standard with all sequences
activated.
Note
It is also possible to activate the “Changeover” function in basic type A:
Room temperature
controller RLU2… (A)
The respective controller is activated as follows:
• Assign input CH OVER at the MODE function block an input Xx
The changeover input, switched by a changeover thermostat in the flow, only
releases the heating or cooling sequences. The individual sequences can be
deactivated via the parameter menu so that the second heating sequence can be
used separately for reheating, for example.
109 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Controller (CTLOOP x) 29.08.2008
To Next Page
Loading...
