APV_CU4plus_AS-interface_UK-3_062019.indd
UK
Control Unit
CU4plus AS-interface
Instruction Manual UK-3
APV
38
7. Valve Position Indication
7.1.
Continuously measuring valve position measuring system
For the internal detection of the valve position indication, a contact-
free operating linear sensor is used which is actuated via the
magnetic switching cam installed at the valve rod. The nominal
measuring range of the measuring system amounts to 0 - 72 mm,
relative repetitive accuracy < 0.1 mm.
Within this measuring range, the corresponding positions for closed
and open valve position as well as seat lift positions are generated
via the teach-in function and permanently saved in the electronic.
7.2.
Tolerance band of the valve position measuring system
The tolerance band of the valve position measuring system
describes the active measuring range in which the corresponding
feedback information, closed or open valve position, is registered.
For different process valves also different tolerance bands exist.
The adjustment is realized via the ToolBox software.
Tolerance
band
Output of feedback
signals in range
Recommendation for
valve type
T1
+/- 1 mm
e.g. DA3+, D4, D4 SL /
PMO, DA4
T2
+/- 3 mm
e.g. SW4, MS4
T3
+/- 5 mm
e.g. SV, SVS, DKR
30
25
35
30
30
30
31
31
31
32
32
32
33
33
33
34
34
34
29
29
29
28
28
28
27
27
27
26
26
26
25
25
25
35
35
35
magnetic switching cam
valve
stroke
(mm)
tolerance
band
T1
± 1mm
tolerance
band
T2
± 3mm
tolerance
band
T3
± 5mm
