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Operating
6.2 Operating modes
Diagnostics parameters '28.SSUP' Slow step zone UP / '29.SSDN' Slow step zone DOWN
The slow step zone is the area of mean control deviation. For more information on the slow
step zone, refer to the section "Control algorithm (Page 27)".
Select small values to achieve high speeds of shifting even with small control deviations.
Select large values to reduce overshoots particularly in case of large changes in the setpoint.
NOTICE
Overshoots or too low speeds of shifting
Too small values can result in overshoots.
• Enter a higher value.
Too large values result in too slow speeds of shifting near the adjusted status.
• Enter a smaller value.
Diagnostics parameters '47.PRUP' Prediction UP / '48.PRDN' Prediction DOWN
These diagnostics parameters act as attenuation factors and are used to set the control
dynamics. Changes in the diagnostics values have the following results:
● Small values result in quick adjustments with overshoots.
● Large values result in slow adjustments without overshoots.
Note
Reference variable
It is advantageous to use a fixed reference variable to optimize the control data.
Therefore, change the deadband of the controller in the '34.DEBA' parameter from "Auto"
to a fixed value.
112
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12
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