39
Winding diameter compensation
function
3.8.9
Winding diameter calculation at start (Pr. 133, Pr. 712, Pr. 790 to Pr. 796)
Winding diameter is calculated when dancer roll moves from the upper limit position to the target position or from the lower
limit position to the target position at a start.
(1) Winding diameter calculation at start
Calculate initial winding diameter "D" from the accumulated amount "L" when dancer roll moves from the upper limit
position to the center position or from the lower limit position to the center position at a start.
When an encoder is used (vector control), number of motor rotation "n" is calculated from the number of encoder
pulses.
When encoder is not used (V/F control, Advanced magnetic flux vector control, Real sensorless vector control), number
of motor rotation "n" is calculated from the integration of output frequency "f".
When
Pr. 792
= "8888", dancer roll is lifted with PI gain at a start, but initial winding diameter calculation is not
performed. This operation is useful to wind up sagging material slowly.
When
Pr. 792
= "9999", winding diameter calculation is not performed, and the winding diameter, which has been used,
is kept. In a case like this, use PI gain of speed control for normal operation instead of gain for winding diameter
calculation.
(2) Initial winding diameter calculation start point
(Pr. 790),
Accumulated amount
(Pr. 792)
Set
Pr. 790
Initial winding diameter calculation start point
and
Pr.792
Accumulated amount
for the initial winding diameter
calculation.
Accumulated amount = 2
L
Parameter
Number
Name
Setting Range
Increments
Initial Value
133
Target dancer position
400% to 600%, 9999
0.01%
500%
712
Initial winding diameter calculation
dead zone 2
0 to 50%, 9999
0.1%
9999
790
Initial winding diameter calculation
start point
400% to 600%
0.01%
400%
791
Initial winding diameter calculation
dead zone
0 to 50%
0.1%
1%
792
Accumulated amount
1 to 5000mm, 8888, 9999
1mm
160mm
793
Speed control P gain at a start
0 to 1000%
1%
60%
794
Speed control integral time at start
0 to 20s
0.001s
2s
795
Integral term limit at a start
0 to 100%
0.1%
2.5%
796
PID term limit at a start
0 to 100%
0.1%
2.5%
D=
2
L
L : accumulated amount
n
Z
n : motor rotation number
Z : gear ratio
n=
120
f
dt
P : number of motor poles
P
CAUTION
Do not use
Pr. 78 Reverse rotation prevention selection
when using initial winding diameter calculator function.
Set
(Pr. 73)
Polarity reversible setting
to adjust the overshoot amount at an initial winding diameter calculation.
To minimize fluctuation of dancer roll when shifting from initial winding diameter calculation to normal operation, set
Pr. 13
= "0".
L
Target position
Initial winding diameter
calculation start point
