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Siemens RDG100KN Basic documentation CE1P3191en

Building Technologies Functions 22 Jun 2010

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)

Y [%]

100

3181D1124a

T[°C]

XpH

½ SDH ½ SDH

3181D105a

Y [%]

100

T[°C]

XpC

Heating and cooling mode (P01 = 4)

T[°C] Room temperature

w Room temperature setpoint

YE Control command “El heater"

(only ON/OFF)

Y1 Control command “Valve” (H)

(only PWM, not 3-position)

Y2 Control command “Valve” (C)

XpH Proportional band “Heating” (P30)

XpC Proportional band “Cooling” (P31)

Dead zone (P33)

Y [%]

100

3181D114a

T[°C]

XpH

XpC

½ SDH ½ SDH

Setpoint differential (P34)

The diagrams only show the PI thermostat’s proportional part.

Setting the sequence and the control outputs

Refer to sections 3.4 "Applications", 3.6.1 "Sequences", and 3.7 "Outputs".

 Y1 can only be ON/OFF or PWM

 Y2 can be ON/OFF, PWM or 3-position

 YE can only be ON/OFF

Note:

Notes:

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