Basic Documentation

202/332
Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Sequence controller 03.10.2011
15.3.2 Operating principle
This function is configurable either as min or max limitation. The effect can be
assigned to a sequence.
If a pump connected to this sequence is to remain active despite limitation, setting
value "Load-dependent OFF" must be set to 0% at the pump. Sequence limitation
does not limit a sequence down to 0%.
Minimum limitation
The limitation function with PI control overrides the normal controller function to
adhere to the limitation setpoint when the value drops below the limitation setpoint.
Minimum limitation causes the relevant sequences to close, the other sequences
are not affected.
Y1
DO
Q1
AO
X...
°C
X...
DI
AI
T
T
w
T
x
min.
12 1 2
Y
y1 y2 a

xa a
Q
p1 p2
x
xxx
QQQ
2
1
12
V AB
B
dxdd
/
p3
Pumpe 1
S3 S2 S1 S4 S5
yp yp yp yp yp
a
d
Controller 1
(Ventilation)
With supply air limitation
Cascade/const (alternating)
Seq. limit. Casc/Const
SAT
Cascade
Constant (supply air)
Pump 1
On
Start Stop
3150S22en
MECH
HR
CC....................
Maximum limitation
The limitation function with PI control overrides the normal controller function to
adhere to the limitation setpoint when the value is above the limitation setpoint.
Maximum limitation causes the sequence to close.
Start
M
DO
DI
A
y1 y2 y3
Mod output
SAT
Note
Application example
Application example