8.3.2.2 '7.TSUP' Setpoint ramp UP / '8.TSDO' Setpoint ramp DOWN
Possible settings: With "TSUP"
● Auto
● 0 ... 400
With "TSDO"
● 0 ... 400
Purpose: The setpoint ramp is effective in "Automatic" mode and limits the
speed of change of the effective setpoint. The parameter specifies
the time in seconds that the positioner needs to move the stroke
from 0 to 100%. Example: If TSUP = 10 is set, the positioner needs
10 s to move the stoke from 0 to 100% and 1 s to move the stoke
from 0 to 10%.
When switching over from "Manual" mode to "Automatic" mode, the
setpoint ramp is used to adjust the effective setpoint to the setpoint
of the positioner.
This smooth switching from "Manual" mode to "Automatic" mode
prevents pressure excess in long pipelines.
The parameter "TSUP = Auto" means the slower of the two actuat‐
ing times determined during initialization is used for the setpoint
ramp. Parameter value "TSDO" then has no effect.
Factory setting: 0
8.3.2.3 '9.SFCT' Setpoint function
Possible settings: ● Lin
● 1 - 25
● 1 - 33
● 1 - 50
● n1 - 25
● n1 - 33
● n1 - 50
● FrEE
Purpose: This parameter is used to linearize nonlinear valve characteristics.
Optional flow characteristics as shown in the figure in the descrip‐
tion of the '10.SL0' ... '30.SL20' Setpoint turning point (Page 147)
parameter are simulated for linear valve characteristics.
Factory setting: Lin
Seven valve characteristics are stored in the positioner and are selected using the 'SFCT'
parameter:
Valve characteristics Set with parameter value
Linear Lin
Equal percentage 1:25 1-25
Equal percentage 1:33 1-33
Equal percentage 1:50 1-50
Parameter assignment
8.3 Description of parameters
SIPART PS2 with PROFIBUS PA
146 Operating Instructions, 05/2019, A5E00127926-AC
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