The following diagram shows the setpoint settings for cascade control, and the
principle by which the CTLOOP 1 controller block generates the supply air
temperature setpoints SpTSuC and SpTSuH:
Setpoint generation
SU MIN
T
T
SU MAX
SU DMIN
SU DMAX
SpTSu
t
SpTSuC
SpTSuH
TSu
TR
SpSu
TR
SETCOOL
SETCOOL
SETHEAT
SETHEAT
CTLOOP 1
LIM
3101S39
The following limit values are preselectable for the supply air temperature
controller:
Supply air temperature
limitation
• SU MAX and SU MIN: Absolute maximum and minimum limitation of the supply
air temperature
• SU DMAX and SU DMIN: Maximum and minimum temperature difference
limitation between the actual value of the room temperature and the supply air
temperature
The following diagram illustrates the operating principle of the 2 supply air
temperature limitations:
Function diagram
SpSu
t
SU MAX
SU MIN
SU DMAX
SU DMIN
TR
Supply air temp
limit value max
Supply air temp
limit value min
Actual value room temp
3101D23en
99 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Controller (CTLOOP x) 29.08.2008
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