Siemens SIPART PS2 6DR50xx Manual page 103

34.DEBA
35.YA
36.YE
.
37.YNRM
SIPART 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.
Operation
103