Functions And Control; 3-Position Control - Siemens Acvatix SAX Series Basic Documentation

Note
Siemens
Building Technologies
4

Functions and control

4.1

3-position control

A 3-position signal drives the actuator
via connection terminals Y1 or Y2. The
required position is transferred to the
valve.
Positioning
Stroke actuator
signal
Actuator's stem
Voltage at Y1
extends
Actuator's stem
Voltage at Y2
retracts
Actuator's stem
No voltage at Y1
maintains the
and Y2
position
Observe information given in chapter "Acting direction and flow characteristic" on
page 41.
Internal control ensures very constant positioning times and determination of the
actuator's position.
Actuators SAX.., SAL.. for valves
Functions and control
1 A/D conversion
Control
2
functions
3 Brushless DC motor
4 Gear train
Manual adjuster
Control path
Rotary actuator
valve AAB
Actuator's spindle
turns in clockwise Opening
direction
Actuator's spindle
turns in counter- Closing
clockwise direction
Actuator's spindle
maintains the position
Identification of seat
Control of direction
Motor control
Manual adjustment
Bypass valve
B  AB
Closing
Opening
Maintains the position
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CE1P4040en
22.12.2010