Siemens SIPART Series - Optimizing the controller data

Operating
6.3 Optimizing the controller data
SIPART PS2 with and without HART
110 Operating Instructions, 10/2013, A5E00074631-11
6.3
Optimizing the controller data
Note
Initializing
Initialize the positioner automatically before changing the parameter settings as per your
specific requirements.
The positioner determines the data for control quality automatically during the initialization
process.
The data determined is optimized for a short transient time in case of minor overshoots.
The adjustment can be accelerated or the attenuation can be intensified by optimizing the
data.
The following special cases are ideal examples for a targeted data optimization:
● Small actuators with actuating times < 1 s.
● Operation with boosters, described in section "Operation with boosters (Page 269)"
Procedure
1. Select the parameters in the diagnostics menu. Press the three buttons of the positioner
at the same time for at least 2 seconds.
2. Activate the setting function. Press the
or button for at least 5 seconds.
3. When you change the selected parameter, it is immediately updated. The effects on the
controller results can then be tested.
In order to optimize the controller data, change the values of the parameters listed below.
22 lmpulse length up / 23 lmpulse length down
You can use these parameters to determine the smallest impulse lengths for each actuating
direction. The actuator is then moved with these lengths. The optimum value depends on the
volume of the actuator in particular. Small values lead to small controller increments and
frequent activation of the actuator. Large values are advantageous for large actuator
volumes.
Note
Controller increments
•
There is no movement if the values are too small.
•
Large controller increments also lead to large movements in case of small actuators.