Siemens SIPART Series User Manual

Parameterizing/addressing
9.4 Description of parameters
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11
177
A4.STEPD - stroke direction
Use this sub-parameter to set the stroke direction of the partial stroke test. The following
parameter values are available:
● "uP" for up
● "do" for down
● "uP do" for up and down
If you select the "uP" parameter value, it leads to the following:
● The actuator moves from the starting position to the target position without control.
● After reaching the target position, the actuator moves back to the starting position in a
controlled manner.
The target position is determined from the starting position
plus
the stroke magnitude.
The same procedure in the reverse order is applicable for the "do" parameter value.
If you select the "uP do" parameter value, it leads to the following:
● The actuator first moves from its starting position to the upper target position without
control.
● Then, the actuator moves from the upper target position to the lower target position
without control.
● After reaching the lower target position, the actuator moves back to the starting position in
a controlled manner.
The upper target position is determined from the starting position
plus
the stroke magnitude.
The lower target position is determined from the starting position
minus
the stroke
magnitude.
The factory setting is "do".
A5.INTRV - test interval
Use this sub-parameter to enter the interval time for the cyclic partial stroke test in days. Set
the test interval in a range from 1 to 365.
The factory setting is "OFF".
A6.PSTIN - partial stroke test reference stroke time (PSTIN = partial stroke test initialization)
Use this sub-parameter to measure the reference stroke time for the partial stroke test. The
unit is seconds. The reference stroke time corresponds to the controlled movement from the
starting position to the target position.
The positioner must be initialized in order to measure a reference stroke time. If the
positioner is not yet initialized, the display shows "NOINI". If the positioner has already been
initialized, the calculated average travel time of the control valve is displayed as a reference
value.
Example: An average travel time of 1.2 seconds is shown in the display as "C 1.2", where
"C" stands for "calculated". The average travel time can be used as a reference stroke time.
However, it merely represents a rough default value.

Siemens SIPART Series Specifications

General

Brand	Siemens
Model	SIPART Series
Category	Accessories
Language	English