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Siemens
Actuators SAS.., SAT.. for valves
CE1P4041en
Building Technologies
Functions and control
2015-05-19
4.2 Modulating
control
The modulating positioning signal
drives the actuator steplessly. The
positioning signal range
(DC 0...10 V / DC 4...20 mA /
0...1000
Ω
) corresponds in a linear
manner to the positioning range (fully
closed...fully open, or 0…100 %
stroke).
The actuator is controlled via terminal
Y or forced control Z (page 30). The
desired stroke / the desired rotation is
transferred to the valve stem / the
valve spindle.
1
Calibration slot
2
LED (2 colors)
3
DIL
switches
Changeover of characteristic
Positioning signal
4
A/D conversion
5
Power supply
6
Control
functions
Identification of seat
Position control
Motor control
Detection of foreign bodies
Calibration
Forced control
Characteristics function
Manual adjustment
7
Brushless DC motor
8
Gear train
Fail safe function
Manual adjuster
Positioning signal
Stroke actuator
Rotary actuator
Control path valve
A
à
AB
Bypass valve
B
à
AB
Signal Y, Z increasing
Actuator’s stem extends
Actuator’s spindle turns in
clockwise direction
Opening
Closing
Signal Y, Z decreasing
Actuator’s stem retracts
Actuator’s spindle turns in
counterclockwise direction
Closing
Opening
Signal Y, Z constant
Actuator’s stem maintains the
position
Actuator’s spindle maintains
the position
Maintains the position
No voltage at Y1 and Y2;
with fail safe function
Actuator’s stem retracts
Actuator’s spindle turns in
counterclockwise direction
Closing
Opening
Observe the information given in chapter 4.2.1 Positioning signal and flow
characteristic selection on page 26.
Note