Siemens RDF300 Documentation page 16

Control sequence
on/off output
Control sequence
modulating output
16 / 40
Siemens
Building Technologies
The diagram below shows the control sequence for on/off (2-position) control.
Heating mode
(automatic changeover=heating or heating only)
Y YE
w
D
1
0
½ SDH
½ SDH ½ SDH
Heating mode with manual changeover
(P01=2)
(manual changeover=heating)
Y
YE
1
w
0
½ SDH ½ SDH
The diagram below shows the control sequence for continuous PI control.
Heating mode
(automatic changeover=heating or heating only)
Y [%] YE Y1
w
D
100
0
XpH
Heating mode with manual changeover
(P01=2)
(manual changeover=heating)
Y [%]
YE
100
0
w
XpH
Note: The diagrams only show the PI controller's proportional part.
RDF300.../RDF340.../RDF400... Basic Documentation
4BFunctions
Cooling mode
(man. /auto. changeover=cooling or cooling only)
Y
Y1
1
w
T[°C] 0
½ SDH
½ SDH
T[°C] Room temperature
W
Y1
YE
SDH Switching differential "Heating"
T[°C]
SDC Switching differential "Cooling"
X
dz
w
D
Cooling mode
(man. /auto. changeover=cooling or cooling only)
Y [%]
100
0
T[°C]
XpH w
T[°C] Room temperature
W
Y1
YE
XpH Proportional band "Heating"
XpC Proportional band "Cooling"
T[°C]
X
dz
w
D
YE
Y1
x
dz
w
½ SDC
½ SDC
½ SDH
Room temperature setpoint
Control command "Valve" or "Compressor"
Control command "electrical heater"
Dead zone
Setpoint differential
YE
Y1
x
dz
XpH w
XpC
Room temperature setpoint
Control command "Valve"
Control command "electrical heater"
Dead zone
Setpoint differential
T[°C]
T[°C]
CE1P3076en
28 Aug 2008