Siemens SIPART PS2 6DR50xx Manual page 21

Electropneumatic positioner for linear and part-turn actuators
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Positioning
Actuator type
pressure
Connection
Y1
Open
Closed
Y1
Open
Closed
Y2
Y1
Closed
Open
Y1
Y2
Closed
Open
Y1
Y1
Y2
Y1
Y1
Y2
Figure 2-6
Pneumatic connection positioning
SIPART PS2 Manual
A5E00074631--06
Safety position after power failure
electrical
Closed
Open
Open
Closed
up
Down
down
up
Up
down
up
Up
down
up
Down
down
Design and Functional Principle
pneumatic
In part-turn actuators the
direction of rotation
counterclockwise looking
onto the actuating shaft of
Closed
the valve is usually defined
as "Open".
Open
Last position
(before power
failure)
Down
Up
Last position
(before power
failure)
Open
Closed
up
down
21

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