Siemens PROFIBUS PA SIPART PS2 Manual page 95

4.INITA
5.INITM
.
6.SDIR
7.TSI
8.TSD
12.SFCT
SIPART PS2 PA Manual
A5E00127926-03
Automatic initialization (see chapter 3.6, page 66)
By selecting "Strt" and pressing the increment key
seconds, automatic initialization is started. The initialization process is
displayed by "RUN 1" to "RUN 5" (see figure 3-28, page 78 to figure
3-31, page 81).
Manual initialization
By selecting "Strt" and pressing the increment key
seconds, manual initialization is started. The manual initialization
process is described in chapter 3.6.3, page 70 and chapter 3.6.6, page
76.
NOTE
If the positioner has already been initialized, for INITA and INITM it is
possible to transfer it to its non-initialized state without changing the
remaining parameters by pressing the decrement key
seconds.
Setpoint direction
The setting of the setpoint direction serves to reverse the direction of
action of the setpoint. It is used mainly in single-acting actuators with
the safety position "up".
Setpoint ramp UP
and
Setpoint ramp DOWN
The setpoint ramp is effective in automatic operation and limits the
speed of alteration of the active setpoint. When switching over from
manual operation to automatic the active setpoint is adjusted to the set-
point on the positioner with the setpoint ramp.
This bumpless manual/automatic switchover avoids excessive pressure
increases on long pipelines.
In the position TSI = Auto the slower of the two travel times determined
during initialization is used for the setpoint ramp. TSD is then ineffec-
tive.
Setpoint function (see figure 4-8, page 94)
Non-linear valve characteristics can be linearized with this function and
any flow characteristics simulated in linear valve characteristics.
Operation
for at least 5
for at least 5
for five
93