Siemens SIPART PS2 6DR50xx Manual page 111

A6.PSTIN
A7.FACT1
A8.FACT2
A9.FACT3
SIPART PS2 Manual
A5E00074631--06
Partial stroke test reference step time
(PSTIN = Partial Stroke Test Initialization)
Measurement of the reference step time for the partial stroke test. After
the initialization of the device, the calculated (C = calculated) average
actuating time of the control valve is displayed in seconds in the form:
C ###.#. This time can be used as reference step time, however it is
only a rough guide value.
That is why it is recommended to measure the reference step time here
after the specification of the partial stroke test (parameters A1 to A5)
by pressing the Greater Than button for five seconds. In doing so,
"rEAL" is shown in the display. The device then automatically moves to
the set start position, performs the desired step and saves the time
required to do this. The time that is measured is the controlled
movement from start position to target position. After the succesful
measurement, this reference step time is shown in the display in the
form: "###.#" seconds.
If a reference step is attempted without previous initialization of the
device, "noini" appears in the display. If the start position cannot be
approached or if the jump destination cannot be reached, "Fdini"
(Failed PST Initialization) is displayed.
Factor 1
Input of the factor for the threshold 1 error message. The factor 1
refers to the reference step time. If a specified partial stroke test results
e.g. in a reference step time of 1.0 second and factor 1 is used in the
factory setting of 1.5, the threshold 1 error message of the partial
stroke test is performed for a measuring time of 1.5 seconds.
Factor 2
Input of the factor for the threshold 2 error message. The factor 2
refers to the reference step time. If a specified partial stroke test results
e.g. in a reference step time of 1.0 second and factor 2 is used in the
factory setting of 3.0, the threshold 2 error message of the partial
stroke test is performed for a measuring time of 3.0 seconds.
Factor 3
Input of the factor for the threshold 3 error message. The factor 3
refers to the reference step time. If a specified partial stroke test results
e.g. in a reference step time of 1.0 second and factor 3 is used in the
factory setting of 5.0, the threshold 3 error message of the partial
stroke test is performed for a measuring time of 5.0 seconds. At the
same time, if this time threshold is exceeded, the excitation signal of
the actuator is cancelled to prevent any sudden breaking free and
overshooting of a valve that might be jammed or rusted in place.
The partial stroke test is thus stopped immediately, a threshold 3 error
is reported and the actuator is moved back to its original position.
Operation
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