Modulating Control - Siemens Acvatix SAX Series Basic Documentation

Notes
Siemens
Building Technologies
4.2

Modulating control

The modulating positioning
signal drives the actuator
steplessly. The positioning
signal range
(DC 0...10 V / DC 4...20 mA,
0...1000 Ω) corresponds in a
linear manner to the positioning
range (fully closed...fully open,
or 0...100 % stroke).
The actuator is driven via
connection terminal Y or forced
control Z (page 44). The
required stroke / rotation is
transferred to the valve's stem /
spindle.
Positioning
Stroke actuator
signal
Signal Y, Z Actuator's stem
increasing extends
Signal Y, Z Actuator's stem
decreasing retracts
Signal Y, Z Actuator's stem
constant maintains the position
• If function module AZX61.1 is used, observe the information given in chapter
"Changeover of acting direction" (page 39).
• Observe the information given in chapter "Acting direction and flow characteristic"
on page 41.
Actuators SAX.., SAL.. for valves
Functions and control
1 Calibration slot
2 LED (2 colors)
3 DIL switches
4 Function module
5 A/D conversion
6 Power supply
Control
7
functions
8 Brushless DC motor
9 Gear train
Manual adjuster
Rotary actuator
Actuator's spindle turns in
clockwise direction
Actuator's spindle turns in
counterclockwise direction
Actuator's spindle
maintains the position
Changeover of characteristic
Positioning signal
Identification of seat
Position control
Motor control
Detection of foreign bodies
Calibration
Forced control
Characteristics function
Manual adjustment
Control path Bypass valve
valve AAB B  AB
Opening Closing
Closing Opening
Maintains the position
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CE1P4040en
22.12.2010