Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Aggregates 03.10.2011
There are three changeover options:
1. Changeover triggered externally via a digital signal:
Here, a digital input must be assigned to "MECH input 1".
The following applies:
Normally closed (low outside temperature) = No inversion
Operating position (high outside temperature) = Inversion
Control by heating sequences (S1, S2, S3)
w
Y
Q
S
3150S34en
Normal position
Operated position
Control by cooling sequences (S4, S5)
AO
T
Digital
.X...
.Y...
DI
M
M
M
12
y1 y2
Y
ax
a
TMil
S3 S2 S1 S4 S5
yp yp
y
pypyp
Damper
Controller 1
(Ventilation)
With supply air limitation
Cascade
Constant (supply air)
Cascade/const (alternating)
Seq. limit. Casc/Const
3150S47en
MECH
CC.........
w
Y
Q
S
3150S35en
Normal position
Operated position
2. Changeover at an adjustable value
Here, an analog input must be assigned to MECH input 1. (Typically: outside
temperature or enthalpy difference outside air – extract air).
If the adjusted MECH limit value is exceeded, the output is inverted.
Control by heating sequences (S1, S2, S3)
w
Y
Q
S
3150S36en
OT < (MECH limit value - hysteresis)
OT > MECH limit value
Control by cooling sequences (S4, S5)
AO
.X...
.Y...
AI
M
M
M
12
y1 y2
Y
ax
a
TMil
T
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
Damper
3150s48en
OT
MECH
CC.........
w
Y
Q
S
3150S37en
OT < (MECH limit value - hysteresis)
OT > MECH limit value
Changeover options