view user manual (pdf) - dyna-flo control valves

Operation
The setpoint vertex values can only be input at 12.SFCT=FrEE. You
may only enter a strictly monotonous characteristic, and two consecutive
vertex values must differ by at least 0.2 %.
34.DEBA
Dead zone of the controller
At dEbA = AUto the dead zone in automatic operation is adapted continuously
to the requirements of the control circuit. The dead zone is
gradually increased on detecting a control oscillation. The reverse
adaptation takes place by a time criterion.
In the other discrete settings the fixed value is used for the dead zone.
35.YA
36.YE
Manipulated variable limiting start (see figure 4-9 and 4-10)
and
Manipulated variable limiting end (see figure 4-9 and 4-10)
With the parameters “YA” and “YE” the mechanical actuating distance
(from stop to stop) is limited to the set values. In this way the mechanical
setting range of the actuator can be limited to the active flow and
the integral saturation of the commanding controller avoided.
. NOTE
YE must always be set to greater than YA.
37.YNRM
Manipulated variable standardization (see figure 4-9 and 4-10)
With limiting of the manipulated variable (by “35.YA” and “36.YE”) two
different scalings are produced for the display and the position feedback
via the current output (MPOS or FLOW).
The MPOS scaling shows the mechanical position (0 to 100%) between
the hard stops of the initialization. This is not affected by the parameters
“35.YA” and “36.YE”. The parameters “35.YA” and “36.YE”
are displayed in the MPOS-scale.
The FLOW-scale is the standardization (0 to 100%) to the range between
“35.YA” and “36.YE”. The setpoint w (0 to 100%) is always referred
to this range. This gives (also by using valve characteristics) a
quasi--flow--proportional display and position feedback Iy.
To calculate the control difference, the setpoint is also shown in the appropriate
scale on the display.
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SIPART PS2 Manual
A5E00074631-03