Mitsubishi Electric A800 Plus Series Function Manual page 57

Parameter setting procedure for dancer feedback speed control
Manual adjustment
1
Installation of the minimum-diameter roll
Install the minimum-diameter roll.
2
Speed control integral time setting
Set "0" in Pr.821 Speed control integral time 1. (The initial value is 0.333 s.)
3
Adjustment with the minimum-diameter roll
Increase Pr.820 Speed control P gain 1 by 10%, and adjust the gain to a 80 to 90 % value of the setting
immediately before vibration/noise starts in the range from the minimum number of rotations to the maximum
number of rotations.
Then, set the Pr.820 value in Pr.641.
4
Installation of the maximum-diameter roll
Install the maximum-diameter roll.
NOTE
• If the maximum-diameter roll is not available, perform the "PID gain adjustment" (refer to
to the maximum diameter while adjusting Pr.820 Speed control P gain 1.
5
Adjustment with the maximum-diameter roll
Adjust the Pr.820 setting in the same way used for the tuning with the minimum-diameter roll. Then, set the
Pr.820 value in Pr.644.
6
Calculation of the medium diameter gain
With medium-diameter roll
Tuning with the medium-diameter roll 1
Adjust the Pr.820 setting in the same way used for the tuning with
1
the minimum-diameter roll.
Then, set the Pr.820 value in Pr.642.
Tuning with the medium-diameter roll 2
Adjust the Pr.820 setting in the same way used for the tuning with
2
the minimum-diameter roll.
Then, set the Pr.820 value in Pr.643.
Set the diameters of the medium-diameter rolls.
Medium-diameter roll 1
Pr.639 Speed control proportional term applied diameter 1
= (Medium diameter 1 - Minimum diameter)/(Maximum diameter -
3
Medium-diameter roll 2
Pr.640 Speed control proportional term applied diameter 2
= (Medium diameter 2 - Minimum diameter)/(Maximum diameter -
56
DANCER FEEDBACK SPEED CONTROL
Minimum diameter) × 100 (%)
Minimum diameter) × 100 (%)
No medium-diameter roll
Set the result of the following calculation in Pr.642 Speed control
proportional gain 2.
Pr.644 − Pr.641
Pr.642 =
Set the result of the following calculation in Pr.643 Speed control
proportional gain 3.
Pr.644 − Pr.641
Pr.643 = 8
Set "9999" (initial value) in Pr.639 and Pr.640.
page 57), and wind the material up
+ Pr.641
5
+ Pr.641
15