9.3.7
Settings
Path:
… > SET
Controller 2, basic type
A; controllers 1+2,
basic type U
Display
Name
Range
Factory setting
SET MAX Economy
setpoint high
Main controlled
variable input range
28 °C, 80 %, 100, 1000
SET MAX Comfort setpoint
high
Main controlled
variable input range
24 °C, 60 %, 60, 600
SET MAX Comfort setpoint
low
Main controlled
variable input range
21 °C, 40 %, 0, 0
SET MAX Economy
setpoint low
Main controlled
variable input range
19 °C, 20 %, 0, 0
9.3.8
Application examples
The universal controller is able to control to an absolute variable or differential
variable. In the case of differential control, the variable to be controlled is the
following:
Main controlled variable (MAIN) minus variable at the differential input (DIFF)
Typical application examples of both control strategies:
•
Basic heating plant, outside temperature-dependent flow temperature control
(without room influence), thermostatic radiator valves
•
Differential pressure control
The chilled ceiling's flow temperature is controlled to an absolute value:
Example of chilled ceiling
(absolute variable)
DO
Q1
M
AO
AI
T
Y
X1
Y
SI
G
N
AL
Y
LABEL
TEMP
y p y p
y p
x
x
x
DI
FF
x
Q
MA
IN
LIM SEQLIM
SHIFT
1
CTLOOP 1
DV
A
LM
SE
Q2 Y
SE
Q2 P
SE
Q1 Y
SE
Q1 P
SE
Q4 Y
SE
Q4 P
SE
Q5 Y
SE
Q5 P
p2
PU
M
P
1
PUMP 1
1
y2
IN
X
x
A0
AO 1
31
01
S
25
107 / 174
Siemens
Universal Controllers RLU2…
CE1P3101en
Building Technologies
Controller (CTLOOP x)
29.08.2008
