Siemens Acvatix SAS31.03 User Manual

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Siemens Actuators SAS.., SAT.. for valves CE1P4041en
Building Technologies Functions and control 2015-05-19
4 Functions and control
4.1 3-position control
Example: brushless DC motor with fail safe function
A 3-position signal drives the actuator
via connection terminals Y1 or Y2. The
required position is transferred to the
valve.
1 A/D conversion
2
Control
functions
Identification of seat
Control of direction
Motor control
Manual adjustment
3 Brushless DC motor
4 Gear train
Fail safe function
Manual adjuster
Positioning
signal
Stroke actuator Rotary actuator
Control path
valve AàAB
Bypass valve
B à AB
Voltage at Y1
Actuator’s stem
extends
Actuator’s spindle
turns in clockwise
direction
Opening Closing
Voltage at Y2
Actuator’s stem
retracts
Actuator’s spindle
turns in counter-
clockwise direction
Closing Opening
No voltage at Y1
and Y2
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 counter-
clockwise direction
Closing Opening
Observe information given in chapter 4.2.1 Positioning signal and flow
characteristic selection on page 26.
Internal control ensures very constant positioning times and determination of the
actuator’s position.
Note

Siemens Acvatix SAS31.03 Specifications

General

Brand	Siemens
Model	Acvatix SAS31.03
Category	Controller
Language	English