Siemens RDG200KN, Basic Documentation, Page: 65 / 150

Functions
Control sequences
4
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T[°C] Room temperature
w Room temperature setpoint
YHC1 Control command "Stage 1"
YHC2 Control command "Stage 2"
SDH Switching differential "Heating"
(P051)
SDC Switching differential "Cooling"
(P053)
w
D
Setpoint differential (P056)
The diagrams below show the control sequence for modulating PI control.
Heating mode (P001 = 0) Cooling mode (P001 = 1)
Changeover (P001 = 2 or P001 = 3,
P254 = 0)
Changeover (P001 = 2 or P001 = 3,
P254 = 1) (swap function)
T[°C] Room temperature
w Room temperature setpoint
YHC1 Control command "Stage 1"
YHC2 Control command "Stage 2" XpH Proportional band "Heating"
(P050)
XpC Proportional band "Cooling"
(P052)
w
D
Setpoint differential (P056)
The diagrams only show the PI thermostat’s proportional part.
For setting sequence and control outputs, see Application overview [
➙ 37],
Sequence overview (setting via P001) [ ➙ 56] and Control outputs [ ➙ 78].
● For applications with different signals, On/Off (1
st
stage) and DC (2
nd
stage),
heating/cooling P-band modulating (P050, P052), a small switching differential
SDH / SDC (P051, P053) is suggested to start 1
st
sequence as soon as heating
/ cooling demand is requested.
● Set the heating flow limitation function with parameter P256 (RDG260KN)
when using a PICV in this application. See Additional functions [ ➙ 42].
Modulating control:
3-position, PWM or
DC 0…10 V
Note
Note