Nexen RSD200 964531 - Manual (Page 19)

19 FORM NO. L-21161-E-0108
A typical winding application begins at core. To insure
that the dancer arm stabilizes as quickly as possible,
the RSD200 should start the adaptation process from
MINIMUM ADAPTATION. This decreases the time it
takes for the RSD200 to adapt its gains to the small roll,
especially after completing the winding of a full roll. The
ADAPTATION value is reset by moving the arm to its
maximum storage position while the RSD200 is stopped
or by providing a SPLICE signal.
The winder may remain active after the machine has
come to a stop. The RSD200, even while Stopped, will
also remain active and continually adjust its output to
maintain the dancer arm’s position.
When the START signal goes high at the Start/Stopped
input, the RSD200 will begin adapting. The web must
begin to move at this instant.
As the roll begins to accelerate, the Dancer Arm will seek
its home position as determined by SETPOINT% (0%
is min storage position, 100% is max storage position).
The roll will continue to increase in size along with the
ADAPTATION and OUTPUT values. During constant
speeds the dancer arm will remain stable, but the output
values will not be steady.
During a machine stop, the ADAPTATION and OUTPUT
values will initially increase to overcome the roll’s inertia.
After the web has come to a complete stop and the
STOPPED signal is given at the Start/Stopped input, the
ADAPTATION value will behave as follows:
• If the ADAPTATION value was greater than
NEW ROLL ADAPTATION before the stop, then
ADAPTATION goes to the NEW ROLL ADAPTA-
TION value.
• If the ADAPTATION value was in-between NEW
ROLL ADAPTATION and MINIMUM ADAPTA-
TION before the stop, ADAPTATION will remain
between these two values.
. WIND APPLICATION
When the RSD200 is in STOPPED mode, the
ADAPTATION value will remain constant and the
OUTPUT value will change depending on the Dancer
Arm’s position. The STOPPED OUTPUT value found in
the OUTPUT LIMITS pane of the SETUP window is used
to limit how high the output can rise. This is useful for
applications where a minimal amount of tension on the
web is desired during a stop.
After the START signal is given, the RSD200 adaptation
will begin from the level as defined previously. This
process is necessary to provide an adaptation value that
is approximate for larger rolls and one that is much closer
for smaller rolls.
R
eSetting
a
DaPtatiOn
Typically when a new core is loaded on the winder shaft,
the web will become slack and the Dancer Arm will go
to its maximum storage position. After that happens,
the ADAPTATION value will be automatically reset to
MINIMUM ADAPTATION.
Any time the SPLICE signal is given with the web moving
or stopped, the ADAPTATION value will be reset to
NEW ROLL ADAPTATION. In most rewind applications
NEW ROLL ADAPTATION will be set nearly the same as
MINIMUM ADAPTATION as most winds begin at core.
However, this also means that if the machine is stopped in
the middle of a wind, and the RSD200 goes into STOPPED
mode, then the adaptation process will begin from a low
value after the next START signal. Therefore, the dancer arm
will take longer to move into position as the RSD200 gains
take longer to adapt to their optimum level.
S
PRing
D
iSengageD
C
lutCh
It is common to use a spring-disengaged clutch on a
winder and this spring can affect performance if the
RSD200’s output becomes too low. Use the MINIMUM
OUTPUT setting found in the OUTPUT LIMITS pane of
the SETUP window to keep the OUTPUT high enough to
overcome the disengage spring force.
Figure 1
Acceleration Acceleration
Run Speed Run Speed
Deceleration Deceleration
Stopped
Start/Stopped Signal
Web Speed
Splice
Signal
Adaptation Adaptation
New Roll Adaptation
Min. Adaptation &
Small Roll Large Roll