Operating instructions

Triggering the partial stroke test (PST)
A partial stroke test is started when the ref
-
erence (w ) moves from the
Operat
-
ing point
into the range between 25 and
50 % travel and remains there for longer
than six seconds. The valve ( ) moves
from the last defined position to the
Lower
range value (of step)
(Code 49 - d2).
After the partial stroke test is completed, the
valve moves back to its previous position
(fail-safe position or
Operating point ).
Canceling the partial stroke test (PST)
The partial stroke test is canceled whenever
the reference variable changes and falls be
-
low the
Fail-safe action limit. The valve
moves back to fail-safe position.
Enable configuration:
Turn
®
Code 3, display:
No
Press , Code 3 blinks
Turn
®
YES
Press , display
Select on/off valve as type of application:
Turn
®
Code 49
Press , Code 49 blinks
Turn
®
Code h0
Press , Code h0 blinks
Turn
®
YES
Press
Enter operating point, test limits and limits
for discrete analysis:
Turn
®
Code h1/h2/h3/h4/h5
Press , Code h1/h2/h3/h4/h5 blinks
Turn to adjust the parameter selected
Press to confirm the setting.
70 EB 8384-6 EN
Start-up – Settings
20
40
60
80
100
Start PST
End PST
Time [s]
Travel [%]
Δt > 6 s
Δt > 6 s
20
40
60
80
100
Start PST
End PST
Time [s]
Travel [%]
Code 49 - h1
Code 49 - h1 =
Code 49 - d2
Code 49 - h5
Code 49 - h4
Code 49 - h3
Code 49 - h2
Code 49 - d2
Code 49 - h5
Code 49 - h4
Code 49 - h3
Code 49 - h2