Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Aggregates 03.10.2011
3. Changeover at an adjustable difference between two measured values
Here, one analog input each must be assigned to "MECH input 1" and "MECH
input 2". (Typically: MECH input 1 = Outside temperature, MECH input 2 = Extract
air temperature).
The output is inverted if as shown in this example the outside temperature with
heating sequence control is greater than the extract air temperature plus MECH
limit value. The hysteresis is a set 1 K.
Control by heating sequences (S1, S2, S3)
w
Y
Q
S
3150S38en
OT < (EAT + limit value - hysteresis)
OT > ( EAT + MECH limit value)
Control by cooling sequences (S4, S5)
AO
.X...
.Y...
AI
M
M
M
12
y1 y2
Y
a
x
a
TMil
T
T
X...
S3 S2 S1 S4 S5
yp yp yp yp yp
Controller 1
(Ventilation)
With supply air limitation
Cascade
Seq. limit. Casc/Const
Damper
Constant (supply air)
Cascade/const (alternating)
3150s49en
OT
EAT
MECH
CC.........
w
Y
Q
S
3150S39en
OT < (EAT + limit value - hysteresis)
OT > ( EAT + MECH limit value)
10.5.9 Fixed preselection during cooling mode
The function corresponds exactly to that described in section
10.4 "
Heat recovery equipment (basic types A, P)".
Main menu > Commissioning > Extra configuration > Aggregates > Mixed air damper >
Operating line Adjustable values / remarks
Cooling coil valve ---, Modulating output A, ...B, ...C, ...D,
Step switch 1, ...2, ...3, ...4, ...5
10.5.10 Startup circuit
The startup circuit is activated by entering a value >0 for the "Startup time".
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Aggregates > Mixed air damper >
Operating line Range Factory setting
Startup time 00.00...59.55 m:s 05.00 m:s
If the outside temperature is available, the startup circuit is only active at outside
temperatures below 15 °C. At outside temperatures above 15 °C, the plant is
started without startup circuit. If no outside temperature is available, startup circuit
is active at all times provided a startup time of > 00.00 is entered.
Configuration
Setting values