EB 8389-1S EN 83
Full stroke test (FST)
13 Full stroke test (FST)
The dynamic valve performance can be eval-
uated by performing this test.
The full stroke test is started in the manual
mode.
The following listed parameters are activated
while the full stroke test is being performed:
− Characteristic selection (Code 20): Linear
− Required transit time OPEN (Code 21):
Variable
− Required transit time CLOSED (Code 22):
Variable
During the full stroke test, the valve moves
through its entire working range.
The rst step ends in the fail-safe position. As
a result, the second step starts from the fail-
safe position.
The change in travel can be performed either
in steps or in a ramp function (Fig. 20). For
the test in a ramp function, additionally the
times for the increasing and decreasing
ramps need to be dened.
After being activated, the test does not start
until the 'Settling time before starting test'
has elapsed. This ensures that the valve has
reached the start position.
Starting from the start position, the valve
moves to the fail-safe position. The valve re-
mains in this position for the time dened by
the 'Waiting time after step change' before
performing a second step change in the op-
posite direction from the fail-safe position to
the start position of the rst step. After the
'Waiting time after step change' has
elapsed, the valve moves back to its operat-
ing point.
Fig. 19: Diagnostics > Monitoring/tests > Dynamic tests > Full stroke test (FST)
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