Signal Priorities - Siemens Acvatix SAS Series Basic Documentation

Actuator without
fail safe function
Examples
Actuator with fail safe
function
Examples
34 / 60
Siemens
Smart Infrastructure
4.2.4

Signal priorities

The actuators are controlled via different interlinked positioning signal paths
(positioning signal "Y", forced control input "Z", manual adjuster). The signal paths
are assigned the following priorities (1 = highest priority, 4 = lowest priority):
Priority
The manual adjuster always has priority 1, thus overriding all signals active at "Z" or
1
"Y", independent of whether or not power is applied.
Only SA..61..: As soon as a valid positioning signal is active at input "Z", the position
2 is determined via positioning signal "Z" (forced control).
Prerequisite: The manual adjuster is not used.
The position is determined via positioning signal "Y" at Y, Y1 or Y2. The manual
3
adjuster is not used and on "Z" there is no active signal.
Manual Forced control
adjuster (Z)
Automatic
Not connected
mode
Automatic
G
mode
Automatic
G0
mode
Operated
(30%) and G
engaged
Bold printing = positioning signal currently active
Priority
The fail safe function responds in the event of a power failure.
1
The position is solely determined via positioning signal "Z" (forced control),
2
provided power is applied.
The position is determined by positioning signal Y, provided power is applied
3
and positioning signal "Z" is not used.
Upon actuation and slightly turning in counterclockwise direction, the manual
adjuster remains engaged.
Power applied:
After 5 seconds, the manual adjuster disengages itself and positioning signal
4 "Y" or "Z" determines the position.
No power applied:
The actuator maintains the position defined by the manual adjuster until power
returns. Upon restoration of power, an automatic ClosedPosition-
Synchronisation will be performed.
Operating Manual
voltage (G/G0) adjuster
Automatic
Applied
mode
Automatic
Applied
mode
Automatic
Applied
mode
Interrupted (fail Automatic
safe function) mode
Operated
Interrupted (fail
(30%)and
safe function)
engaged
Bold printing = positioning signal currently active
Actuators SAS.., SAT.. for valves
Functions and control
Description
Positioning
Stroke actuator
signal (Y)
Actuator's stem travels
5 V
to position (50%)
3 V Actuator's stem extends
3 V Actuator's stem retracts
Actuator's stem extends
8 V
manual (to 30%)
Description
Forced Positioning
control (Z) signal (Y)
Not connected 5 V
G 3 V
G0 3 V
G 6 V
G 8 V
Z
Y
Rotary actuator
Actuator's spindle
travels to position
(50%)
Actuator's spindle turns
in clockwise direction
Actuator's spindle turns
in counterclockwise
direction
Actuator's spindle turns
manually in
counterclockwise
direction (to 30%)
Z
Y
Stroke actuator
Actuator's stem travels to
position (50%)
Actuator's stem extends
Actuator's stem retracts
Actuator's stem retracts (until
end position is reached)
Actuator's stem retracts (until
end position is reached), then:
Actuator's stem extends
manually (to 30%)
CE1P4041en
2019-04-09