Operation
103
SIPAR T PS2 Manual
A5E00074631--06
Dead zone of the controller
At dEbA = AUto the dead zone in automatic operation is adapted con-
tinuously 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.
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 mechani-
cal 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.
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 feed-
back via the current output (MPOS or FLOW).
The MPOS scaling shows the mechanical position (0 to 100%) be-
tween the hard stops of the initialization. This is not affected by the pa-
rameters “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 be-
tween “35.YA” and “36.YE”. The setpoint w (0 to 100%) is always re-
ferred 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 ap-
propriate scale on the display.
34.DEBA
35.YA
36.YE
37.YNRM
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