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Siemens
RDG100.., RDG110.., RDG160T.. Basic Documentation
CE1P3181en
Building Technologies
Functions
2015-07-29
Modulating control: 3-position or PWM
The diagrams below show the control sequence of modulating PI control.
Heating mode with manual selection (P01=2)
Cooling mode with manual selection P01=2)
Heating and cooling mode (P01=4)
T[°C] Room temperature
w
Room temperature setpoint
YE Control. command "Electric heater"
(only On/Off)
YH Control command "Valve" or "Comp." (H)
(only PWM, not 3-position)
YC Control command "Valve" or "Comp." (C)
XpH Proportional band "Heating" (P30)
XpC Proportional band "Cooling" (P31)
X
dz
Dead zone (P33)
w
D
Setpoint differential (P34)
The diagrams only show the PI controller’s proportional part.
Setting the sequence and the control outputs
Refer to section 4.5, 4.7.1 and 4.7.2.
YH can only be On/Off or PWM
YC can be On/Off, PWM or 3-position
YE can only be On/Off
Note
Notes