Parameter setting procedure for dancer feedback speed control
57
3
3.4.4
PID gain adjustment
Adjust the PID gain of dancer feedback speed control.
Adjustment by tension PI gain tuning (recommended)
The PID gain is adjusted by tension PI gain tuning (refer to
). Tension PI gain tuning is recommended for PID gain
adjustment.
Manual adjustment
• Set the minimum-diameter roll for winding and the maximum-diameter roll for unwinding. Connect the material from the
beginning to the end of the machine, and increase the line speed gradually while observing the movement of the dancer
roll. Adjust the line speed so that the dancer roll moves properly.
• Adjust the PID gain so that the dancer roll works without problems at acceleration, constant speed, deceleration, and
sudden deceleration.
• It is important to adjust the dancer PI gain as high as possible for the minimum-diameter roll.
• Normally, adjust the gain with
Pr.129 PID proportional band
and
Pr.130 PID integral time
.
POINT
POINT
• Adjust the gain so that overshooting occurs once or so before the dancer roll returns to the set position.
• Refer to the following according to the dancer roll condition.
NOTE
• Set
Pr.134 PID differential time
only when it is necessary as it causes hunting. However, set a small value in
Pr.134
to
cease fluctuation of the dancer roll by disturbance and such at an early point. (Set 0.01 s at first and gradually increase the
value.)
Status
Adjustment method
When the response is
slow (the dancer roll
position is too low)
• Decrease
Pr.129 PID proportional band
by 10%.
• Decrease
Pr.130 PID integral time
by 0.1 s.
• Repeat the adjustment procedure in the range from the minimum diameter to the maximum diameter so that
the dancer roll moves properly at acceleration, constant speed, deceleration, and sudden deceleration.
When the response is
fast (hunting occurs too
frequently)
• Increase
Pr.129 PID proportional band
by 10%.
• Increase
Pr.130 PID integral time
by 0.1 s.
• Repeat the adjustment procedure in the range from the minimum diameter to the maximum diameter so that
the dancer roll moves properly at acceleration, constant speed, deceleration, and sudden deceleration.
Slow response
(the dancer roll position is too low)
Fast response
(hunting occurs too frequently)
Proper condition
Summary of Contents for A800 Plus Series
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