Formula (uP): Upper target position = Start position (A1.STPOS) ± Start tolerance
(A2.STTOL) + Stroke height (A3.STRKH)
do: Actuator only moves downward
● The actuator moves from its start position to the lower target
position.
● After reaching the lower target position, the actuator moves
back to the start position.
Formula (do): Low target position = Start position (A1.STPOS) ± Start tolerance
(A2.STTOL) - Stroke height (A3.STRKH)
uP do: Actuator moves upwards and downwards
● The actuator first moves from its start position to the upper target
position.
● It then moves from the upper target position to the lower target
position.
● After reaching the lower target position, the actuator moves
back to the start position.
Formula (uP do) Target position = Start position (A1.STPOS) ± Start tolerance
(A2.STTOL) ± Stroke height (A3.STRKH)
Factory setting: do
A5.RPMD - Ramp mode
Setting options: ● OFF
● On
Purpose: Enable or disable ramp mode.
● OFF: The partial stroke test is executed in an uncontrolled man‐
ner.
● On: The Partial Stroke Test is executed in a controlled manner.
The positioner controls according to the ramp rate set in param‐
eter "A6.RPRT".
Use ramp mode to shorten or extend the duration of the Partial
Stroke Test. Extend the Partial Stroke Test to give the higher-level
control loop a chance to react to the Partial Stroke Test.
Factory setting: OFF
A6.RPRT - Ramp rate
Setting range: 0.1 ... 100.0
Purpose: Change the ramp rate to shorten or extend the duration of the partial
stroke test. The ramp rate refers to the total stroke of the control valve
and is set in % stroke per second (%/s). Smaller values extend the
duration, larger values shorten the duration of the Partial Stroke Test.
Example: Setting "10.0" means that the Partial Stroke Test is run with
10% stroke per second.
Factory setting: 1.0
Parameter assignment
8.4 Description of parameters
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE 165
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