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Siemens
Actuators SAS.., SAT.. for valves
CE1P4041en
Smart Infrastructure
Functions
and control
2019-04-09
The specified positioning times refer to the respective nominal stroke. Since the
end positions of rotary actuators are inside the actuator, the following remarks refer
to stroke actuators.
The resulting effective strokes vary, depending on the type of valve, resulting in
shorter or longer actuator positioning times.
S
tro
ke
of
va
lv
e-actu
ato
r
co
mb
ination
[m
m]
Positioning time
[sec]
Legend diagram
A
Mechanical end position in actuator
B
Valves with 5.5 mm nominal stroke
X
Time to override idle stroke (delay time), see glossary
Deviations occur
·
after several positioning signals Y1 and Y2 in the same direction since the stroke
movement starts with a delay of 50 ms (SAT31.., SAS31.53, SAS81.33) or 300
ms (SAS31../81..).
·
when positioning signals Y1 and Y2 are active for less than 50 ms or 300 ms
since the stroke movement cannot be made in that case
.
Example of an actual position deviation on the
SAT31.008
at a 50 ms delay.
A
B
C
Y1
Y2
0
Calculated position
Actual position
Positioning
time [ms]
Positioning signals
(power applied)
No power applied
Positioning times stroke
model
Notes
