Anti-icing protection for the HR unit,
acting on sequence 1 (Y6), closing.
Application example,
HR
The temperature at limit sensor B21 must, for example, be at least 0 °C
(SEQ SET), otherwise throughput will be steplessly limited by Y6.
Basic diagram Function diagram
M
M6
Y6
T
T
M
Y3
M3
3101S35
B21
ctl
1
0
TSu
3101D04
M3
Y6
Y3
M6
SpTSuH
In a boiler with risk of corrosion, the return temperature (water inlet temperature at
B7) is prevented from falling below a certain level, acting on sequence 1 (Y3):
Application example,
boiler
M
T
T
N.X1
B1
Y3
N.Q1
N.Q2
N.X2
B7
3101S36
If the controlled variable exceeds the limit setpoint (SEQ SET), the limit function
with PI control (SEQ XP, SEQ TN) overrides the normal control function to maintain
the limit setpoint.
Maximum limitation
Maximum limitation causes the sequence to close.
Maximum limitation of the return temperature (TRL), acting on sequence 1 / valve
M:
Application example, air
heater
Basic diagram Function diagram
T
B1
T
M
TRL
3101S37
M6
ctl
1
0
TSu
3101D06
SpTSuH
M6
SEQ1 Y
125 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Controller (CTLOOP x) 29.08.2008
To Next Page
Loading...
