Siemens RDG20 KN Series - Page 96

Functions
Control sequences
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The diagrams below show the control sequence for modulating PI control.
Heating and cooling (P001 = 4)
Heating mode with manual selection
(P001 = 3)
Cooling mode with manual selection
(P001 = 3)
T[°C] Room temperature
YE Control command "EI heater"
w Room temperature setpoint
YH Control command
"Valve" (heating)
X
dz
Dead zone (P055)
YC Control command " Valve "
(cooling)
w
D
Setpoint differential
(P056)
XpH Proportional band
"Heating" (P050)
XpC Proportional band "Cooling"
(P052)
The diagrams only show the PI thermostat’s proportional part.
For setting sequence and control outputs, see Application overview [➙ 43],
Sequence overview (setting via P001) [➙ 77] and Control outputs [➙ 101].
Parameter P256 (RDG264KN only), P260 & P261 (RDG26..KN) sets the heating
flow limitation. See Additional functions [➙ 48].
● YH can only be DC, On/Off or PWM
● YC can be DC, On/Off, On/Off 3-wired, PWM or 3-position
● YE can only be DC, On/Off or PWM
Modulating control:
3-position or PWM
Note
Note