Tsup' Setpoint Ramp Up / '8.Tsdo' Setpoint Ramp Down; Sfct' Setpoint Function - Siemens SIPART PS2 Operating Instructions Manual

Parameter assignment
8.3 Description of parameters
8.3.2.2

'7.TSUP' Setpoint ramp UP / '8.TSDO' Setpoint ramp DOWN

Possible settings:
Purpose:
Factory setting:
8.3.2.3

'9.SFCT' Setpoint function

Possible settings:
Purpose:
Factory setting:
Seven valve characteristics are stored in the positioner and are selected using the 'SFCT'
parameter:
Valve characteristics
Linear
Equal percentage
Equal percentage
Equal percentage
146
With "TSUP"
● Auto
● 0 ... 400
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.
0
● Lin
● 1 - 25
● 1 - 33
● 1 - 50
● n1 - 25
● n1 - 33
● n1 - 50
● FrEE
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.
Lin
1:25
1:33
1:50
With "TSDO"
● 0 ... 400
Set with parameter value
Lin
1-25
1-33
1-50
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC