Siemens RDG160 User Manual download pdf (Page 15)

Technical and mechanical design

Functio

n The heating element with its solid expansion material converts the electrical positioning

signal to linear

travel of the valve stem. This causes the stem to extend or retract,

opening or closing the valve, depending on the type of valve.

The STS61.. actuator has no rotating parts, ensuring noiseless and wear- and tear-free

operation.

Depending on the connection of the positioning signal (Y or Y), the actuator offers 2

directions of action. It is therefore suited for both NO radiator valves, VD1..CLC small

valves, MiniCombiValves, Combi valves and NC small valves, for example V..P47..

Operation Breakdown

Direction

of action

Positioning signal

DC 0…10 V

Actuator

stem

Valve

behavior

Actuator without operating

voltage



Y increasing Retracted NO opens NO radiator valve, VD1..CLC

small valve, MCV or Combi

valves closed



Y increasing Extended NC opens NC small valve fully open

Direction of action  Direction of action 

Positioning signal Y increasing

DC 0…10 V

Positioning signal Y increasing

DC 0…10 V

10 V0 V

0 %

100 %

4880Z16

10 V0 V

100 %

0 %

4880Z17

4880Z18

0 V

4880Z19

10 V

4880Z20

0 V

4880Z21

10 V

 Actuator stem retracted

 NO (Normally Open)

radiator or Combi valve opens

 Actuator stem extended

 NC (Normally Closed)

small valve opens

Operation

Breakdow

n When there is no positioning signal DC 0…10 V and a power failure (AC 24 V missing),

the actuator stem is alw

ays extended.

4880Z26

DC 0...10 V

AC 24 V

4880Z27

DC 0...10 V

AC 24 V

NO radiator, Combi valve

The valve is closed.

NC small valve

The small valve is opened.

When the actuator is de-energized, small valve types V..P47.. are fully opened.

Warning

3/8

Siemens Electrothermal actuators CE1N4880en

Building Technologies 11.10.2011

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Siemens RDG160 User Manual Page 15

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