EB 8384-6S EN
117
EB 8384-6S
117
Operating the positioner
If the set point ( ) is above 'Limit operating
point' when the automatic mode starts, the
valve ( ) moves to the operating point. The
valve moves back to the fail-safe position (0 %
in the example) if the set point then falls below
'Limit fail-safe position'.
Operating point
Operating point limit
Fail-safe action limit
Fail-safe position
t < 6 s
t [s]
25
50
x [%]
w [%]
Starting the partial stroke test (PST)
A partial stroke test is started when the set
point ( ) moves into the range between 25
and 50 % of the travel range and remains
there for longer than six seconds.
The PST diagnostic parameter 'Lower range
value' must be within the defined position ±
'Tolerance limit' for the partial stroke test to
start.
After the partial stroke test is completed, the
valve moves back to its last position (fail-safe
position or operating point).
Operating point =
Lower range value (PST)
Fail-safe action limit
Fail-safe position
Upper range value (PST)
Operating point limit
Stop PST
Start PST
> 6 s
t [s]
x [%]
w [%]
t
25
50
The partial stroke test (PST) is performed according to the specifications in Code 49 - d2 to
49 - d9 (
u
EB 8389-1S on EXPERTplus valve diagnostices.
Canceling the partial stroke test (PST)
The partial stroke test is canceled whenever the set point ( ) leaves the range between 'Fail-
safe action limit' and 'Operating point limit', falling below 'Operating point limit'.
After the partial stroke test is canceled, the valve moves back to its last position (fail-safe
position or operating point).
Note
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