Siemens RDG100T - Page 28

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Siemens RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation CE1P3181en
Building Technologies Functions 14 Dec 2011
Modulating control: 3-position, PWM or DC 0…10 V
The diagrams below show the control sequence for modulating PI control.
Heating mode Cooling mode
Y [%]
100
0
w
3191D122_01
T[°C]
YR
XpH
YHC
w
D
XpR
Y [%]
100
0
w
3191D123_01
T[°C]
YHC
XpR
YR
x
dz
XpC
T[°C] Room temperature XpH Proportional band “Heating” (P30)
W Room temperature setpoint XpC Proportional band “Cooling” (P31)
YHC Control command “Valve” X
dz
Dead zone (P33)
YR Control command “Radiator” w
D
Setpoint differential (P34)
The diagrams only show the PI controller’s proportional part.
Setting the sequence and the control outputs
Refer to sections 4.5 ("Applications"), 4.7.1 ("Sequences") and 4.7.2 ("Outputs").
Note