EB 8389 EN
85
Tests
5.5 Full stroke test (FST)
3730-2 3730-3 3731-3 3730-4 3730-5 3731-5
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The dynamic valve performance can be eval-
uated by performing the 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 first 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 ei-
ther in steps or in a ramp function (Fig. 15).
For the test in a ramp function, additionally
the times for the rising and falling ramps
need to be defined.
After being activated, the test does not start
until the 'Settling time before test start' 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 defined by
Fig. 14:
Diagnosis > Tests > Full stroke test
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