Siemens RDG100 Documentation page 28

ON/OFF control
Modulating control: 3-position, PWM or DC 0...10 V
Note
Setting the sequence and the control outputs
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The diagram below shows the control sequence for 2-position control.
Heating mode with manual selection
(P01=2)
Y
Y1
1
w
0
½ SDH ½ SDH
Heating and cooling mode (P01=04)
Y
Y1
Y2
½ x ½ x
dz
dz
1
w
0
½ SDC
½ SDH ½ SDH
The diagram below shows the control sequence of modulating PI control.
Heating mode with manual selection
(P01=2)
Y [%]
Y1
100
0
w
XpH
Heating and cooling mode (P01=04)
Y [%]
Y1
Y2
½ x ½ x
dz
dz
100
0
w
XpH
XpC
The diagrams only show the PI controller's proportional part.
Refer to sections 4.5 (applications), 4.7.1 (sequences) and 4.7.2 (outputs).
RDG100.../RDG110.../RDG140.../RDG160... Basic Documentation
Functions
www.heronhill.co.uk
Cooling mode with manual selection
(P01=2)
Y
1
T[°C] 0
½ SDC
T[°C] Room temperature
w Room temperature setpoint
Y1 Control command "Valve" or "Comp." (H)
Y2 Control command "Valve" or "Comp." (C)
SDH Switching differential "Heating" (P30)
T[°C]
½ SDC
SDC Switching differential "Cooling" (P31)
X Dead zone (P33)
dz
Cooling mode with manual selection
(P01=2)
Y [%]
100
T[°C]
0
T[°C] Room temperature
w Room temperature setpoint
Y1 Control command "Valve" heating
Y2 Control command "Valve" cooling
T[°C]
XpH Proportional band "Heating" (P30)
XpC Proportional band "Cooling" (P31)
X Dead zone (P33)
dz
Y2
w
T[°C]
½ SDC
Y2
T[°C]
w
XpC
CE1P3076.en
28 May 2009
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