Changeover Of Acting Direction - Siemens Acvatix SAX Series Basic Documentation

Examples
DIL switches
Selecting the acting
direction
Siemens
Building Technologies
Positioning signal
Legend diagram
A DC 2...10 V
B DC 0...5 V
C DC 12...17 V
H Stroke or rotary angle
Acting direction: Direct (A, B, C)
Acting direction: Reverse (A', B', C')
4.3.2

Changeover of acting direction

Direct acting
1)
OFF
positioning signal Y or Z
1)
Factory setting: All switches set to OFF
• With valves whose stem is extended in the fully closed position, "direct acting"
means that the valve is fully closed (0 %) when positioning signal Y = 0 V resp.
Z = 0 Ω. This applies to all Siemens valves according to "Equipment
combinations" (page 10).
• With valves whose stem is retracted in the fully closed position, "direct acting"
means that the valve is fully open (100 %) when positioning signal Y = 0 V resp.
Z = 0 Ω.
Y, Z Positioning signal
V Volumetric flow
Acting direction: Direct
Acting direction: Reverse
Actuators SAX.., SAL.. for valves
Functions and control
Position LO
range
2
0
C
Acting direction
1)
ON
Direct acting
Positioning signal Y:
Positioning signal Z:
Position
Position UP
feedback U
6 DC 0...10 V
3 DC 0...10 V
3 DC 0...10 V
Reverse acting
positioning signal Y or Z
Reverse acting
DC 0...10 V
4...20 mA
0...1000 Ω
CE1P4040en
22.12.2010
39 / 60