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Siemens RDG100KN Basic documentation CE1P3191en
Building Technologies Functions 22 Jun 2010
The demand calculated by PI control from the current room temperature and set-
point is provided via Y1 and Y3 to the valve actuator as a PWM (pulse width
modulation) signal for thermal actuators. The output is activated for a period
proportional to the heating / cooling demand and then switched off for the rest of
the PWM interval.
The interval is 150 seconds (factory setting). It can be adjusted via parameters
P44 (Y1) or P45 (Y3). These parameters are only visible if 2-position is selected via
DIP switches 4 and 5 and if PWM is selected via P46 and P47.
For thermal valve actuators, set the running time to 240 seconds.
Never apply PWM to a motorized actuator
It is not possible to ensure exact parallel running of 2 or more thermal valve
actuators. If several fan coil systems are controlled by the same room
thermostat, preference should be given to motorized actuators
For electric heaters, set the running time to 90 seconds.
To avoid burn-off of mechanical contacts by frequent switching, use a current valve
in place of a relay or contactor.
3.7.2 Control outputs configuration (setting via DIP switches
4/5 or tool, and parameters P46/P47)
The type of the control outputs (2- or 3-position) is set via DIP switches 4 and 5.
The patterns of DIP switches 4 and 5 are as follows:
ON
OFF
12345
ON
OFF
123 45
ON
OFF
123 45
ON
OFF
12345
3181D101
Y1/Y2 = 2-position 2-position 3-position 3-position
Y3/Y4 = 2-position 3-position 2-position 3-position
If 2-position is selected, the factory setting is ON/OFF. If you want PWM (pulse
width modulation), set parameters P46 and/or P47 to 2 = PWM
4-pipe with electric heater: As the electric heater requires 1 of 4 outputs,
only the cooling valve actuator can be 3-position
DIP switches 4 and 5 have no impact if the application is commissioned via tool.
Control outputs need to be set via ACS in this case
For details concerning connection of peripheral devices and setting of the DIP
switches, refer to the Mounting Instructions M3191 [3].
PWM control
PWM for thermal
valve actuators
Note!
PWM for electric heaters
Notes: