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Tests
The 'Tolerance limit of step response' param-
eter defines the permitted valve positions for
the start value and the end value for the step.
The 'Scan rate' defines the time interval be-
tween which the measured values are re-
corded during the test.
Test cancelation conditions
Various cancelation conditions provide addi-
tional protection against the valve slamming
shut or moving past the end position. The
positioner cancels the full stroke test when
one of the following cancelation conditions is
fulfilled:
Operating point + Tolerance limit
Operating point – Tolerance limit
Fig. 15: Course of the full stroke test with step response (left) and ramp function (right)
76
x [%]
100
Op. point
Settling time
before test start
Delay time
after step
− 'Max. test duration': The test is canceled
when the maximum permissible test du-
ration is reached.
Additionally, the full stroke test is canceled
when one of the following events arises:
− 'Aborted by int. solenoid valve/forced
venting': The test was canceled by the
activation of the solenoid valve/forced
venting function.
− 'Supply pressure/friction': An insufficient
supply pressure or excessive friction oc-
curred during the test.
Settling time
before test start
Delay time
after step
Delay time
Delay time
after step
after step
Ramp time
Ramp time
falling
rising
EB 8389S EN
t [s]
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