Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Temperature controller (basic type A) 03.10.2011
If cooling sequence 4+5 is active, minimum limitation can be lowered by an
adjustable value (operating line Reduction min limitation cooling).
This allows to prevent the refrigeration machine from switching off immediately in
the case of multi-stage cooling.
Supply air limitation, relative
The set limitation setpoints relate to the temperature differential between the room
temperature and the supply air temperature.
In addition, a Differential high and Differential low can be entered where the supply
air can approximate the room temperature.
Main menu > Controller 1 >
Operating line Comments
Actual value supp air temp
11.6 Room supply or extract air cascade control
Room / supply air cascade control Extract air / supply air cascade control
N.X2
Y
SIGNAL Y
x
RT
N.X1
Y
SIGNAL Y
x
SAT
S3 S2 S1 S4 S5
yp yp yp yp yp
a
d
Controller 1
(Ventilation)
With supply air limitation
Cascade
Constant (supply air)
Cascade/const (alternating)
Seq. limit. Casc/Const

N.X1
Y
SIGNAL Y
x
EAT
N.X1
Y
SIGNAL Y
x
SAT
S3 S2 S1 S4 S5
yp yp yp yp yp
a
d
Controller 1
(Ventilation)
With supply air limitation
Cascade
Constant (supply air)
Cascade/const (alternating)
Seq. limit. Casc/Const

11.6.1 Operating principle
The following description also applies to extract air/supply air cascade.
The main controlled variable is the room temperature.
The PI room temperature controller predefines the setpoint for the supply air
temperature within the adjusted limit values (PI-PID room / supply air temperature
cascade control).
 The following limit values can be predefined for the supply air temperature
controller:
 Absolute maximum and minimum limitation of the supply air temperature
 Max and min temperature difference limit control between the current room
temperature value and the supply air temperature
Special case
Display values
Note