Operation
101
SIPART PS2 Manual
A5E00074631--06
Positioner 1
Positioner 2
100 %-SPRE
100 %-SPRA
SPRA
SPRE
[0 % to 100 %]
y = x
100 %
0 %
Positioner 1
Positioner 2
6.SDIR = FALL
6.SDIR = riSE
J
W
Setting range 1
Setting range 2
Total setting range
100 %
Figure 4-8
Example: Split range-operation with two positioners
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 TSUP = Auto the slower of the two travel times deter-
mined during initialization is used for the setpoint ramp. TSDO is then
ineffective.
Setpoint function (see figure 4-9, page 102)
Non-linear valve characteristics can be linearized with this function and
any flow characteristics simulated in linear valve characteristics.
10.TSUP
11.TSDO
12.SFCT
Summary of Contents for SIPART PS2 6DR50 Series
Page 40: ...Design and Functional Principle 40 SIPART PS2 Manual A5E00074631 06 Table 2 1 Scopetuator ...
Page 88: ...Preparing for Operation 88 SIPART PS2 Manual A5E00074631 06 ...
Page 96: ...Operation 96 SIPART PS2 Manual A5E00074631 06 Figure 4 6 Parameter table of the positioner ...
Page 144: ...Operation 144 SIPART PS2 Manual A5E00074631 06 ...
Page 160: ...Appendix 160 SIPART PS2 Manual A5E00074631 06 ...