Siemens SIPART PS2 Series Operating Instructions Manual page 165

Formula (uP):
Formula (do):
Formula (uP do)
Factory setting:
A5.RPMD - Ramp mode
Setting options:
Purpose:
Factory setting:
A6.RPRT - Ramp rate
Setting range:
Purpose:
Factory setting:
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE
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.
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.
Target position = Start position (A1.STPOS) ± Start tolerance
(A2.STTOL) ± Stroke height (A3.STRKH)
do
● OFF
● On
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.
OFF
0.1 ... 100.0
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.
1.0
Parameter assignment
8.4 Description of parameters
165