57
Polarity (358)
The
Polarity
parameter controls whether the
PI Output
needs to be unipolar (positive only)
or bipolar (positive and negative).
Deadband (354)
The
Deadband
adjustment is used to provide a window of tolerance in the error signal that
the integral circuit will ignore. This is commonly used to ignore small dancer movements.
Reset (357)
When True, resets the
PI Output
to zero.
Enable (495)
When False, resets the
PI Output
to zero.
PI Trim (359)
The
PI Trim
adjustment controls the amount of correction that the
PI Output
can provide.
PI Scale (360)
The
PI Scale
adjustment provides for a method to scale the
PI Output
via an external signal.
This signal is typically a line speed signal from an Analog Input.
Output (364, Read-Only)
The output of the PI loop after being modified by the
PI Trim
and
PI Scale
parameters.
Proportional Status (362, Read-Only)
The individual proportional component of the
PI Output
. This parameter is provided for aid in
setup and tuning.
Integral Status (363, Read-Only)
The individual integral component of the
PI Output
. This parameter is provided for aid in
setup and tuning.
At Limit (361, Read-Only)
When the Integral signal saturates at
±
100.00%, the
At Limit
parameter becomes True.
This may indicate that the
PI Trim
parameter may need to be increased. This parameter is
provided for aid in setup and tuning.
7.31 Applications Block - Winder Speed Calculator
A problem encountered in center driven wind and unwind
applications is the nonlinear relationship between the
diameter of a roll and the motor speed required to
maintain constant surface speed of the roll during
diameter increase or decrease. A plot of this
relationship shows a hyperbolic curve.
With inputs proportional to line speed and roll diameter,
the required Winder or Unwinder Motor Speed can be
calculated. The rate of material pay-out from a center
driven unwinder would be held constant during roll
diameter decrease. The line speed signal could come
from a tachometer on the line drive or mounted on the
machine to sense speed. The diameter signal could come
from an ultrasonic measuring unit like the SONICTRAC
®
or from a
mechanical measuring device such as a rider arm and pot. The
scaled line speed is divided by the scaled diameter signal to
generate the center drive speed reference. Depending on
required system response, a dancer or other device may be required for limited transient
compensation between the center winder/unwinder and other driven parts of a line.
Figure 52
Summary of Contents for Elite Pro EPN020-000
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