5-5
DANCER APPLICATIONS
www.maxcessintl.com
MAGPOWR DFC-90
MI 850A265 1 G
Optional dancer
optimization
After tuning of the dancer, the following method will usually
optimize the stability and responsiveness of the dancer. The method
begins by placing the dancer in PD mode with a roll diameter near
core and reducing the gain to a level which the user may consider
unacceptable. Gain will subsequently be increased to a more
desirable level.
If using PID mode, the dancer is placed in PID mode with a roll
diameter near full roll and the integrator is reduced to a level which
the user may consider unacceptable. Then, the integrator will be
increased to a more desirable level. Sometimes, it may be necessary
to first make the PD mode adjustment at a larger roll diameter, and
then refine the adjustment near core.
Do not switch between PD/PID while the machine is running since
this may result in a large transient jump in the output
PD mode
1.
With a roll diameter near core and the machine stopped, set the
F switch to PD mode.
2.
Run the machine and adjust the POS1 pot to center the dancer
arm.
3.
Decrease the P pot by rotating counter-clockwise until the
dancer stabilizes. The POS1 pot may require readjustment
several times in order to keep the dancer roll centered.
DEFINITION: In the following steps the user will have to determine if
the dancer is overshooting. To do this, move the stable dancer away
from its set position by pushing on the dancer, by bumping the
unwind/rewind roll, or by some similar means. If the dancer goes
past the set position before settling to the set position, it is
overshooting. If the dancer goes straight to the stable position
without going past it, the dancer is not overshooting.
4.
Increase the P pot by rotating clockwise in small steps checking
for dancer overshoot at each step. Do this until overshoot is
obtained.
(continued)
