Siemens SIPART PS2 6DR52xx - Manual (Page 21)

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