Siemens 6DR55 Series, Manual

Page: 104 / 178

Operation
102
SIPART PS2 PA Manual
A5E00127926--05
Automatic initialization (see chapter 3.6, page 74)
By selecting ”Strt” and pressing the increment key for at least 5
seconds, automatic initialization is started. The initialization process is
displayed by ”RUN 1” to ”RUN 5” (see figure 49, page 85 to figure 52,
page 88).
Manual initialization
By selecting ”Strt” and pressing the increment key for at least 5
seconds, manual initialization is started. The manual initialization
process is described in chapter 3.6.3, page 78 and chapter 3.6.6, page
83.
.
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 for five
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
setpoint 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
ineffective.
Setpoint function (see figure 61, page 103)
Non--linear valve characteristics can be linearized with this function and
any flow characteristics simulated in linear valve characteristics.
4.INITA
5.INITM
6.SDIR
7.TSI
8.TSD
12.SFCT