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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.
Parameter
Number
133
Target dancer position
Initial winding diameter calculation
712
dead zone 2
Initial winding diameter calculation
790
start point
Initial winding diameter calculation
791
dead zone
792
Accumulated amount
793
Speed control P gain at a start
794
Speed control integral time at start
795
Integral term limit at a start
796
PID term limit 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.
2 L
D=
n Z
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".
120 f
n=
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.
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".
(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.
Initial winding diameter
Accumulated amount = 2 L
Name
L : accumulated amount
n : motor rotation number
Z : gear ratio
dt
P : number of motor poles
P
Target position
calculation start point
Winding diameter compensation
Setting Range
Increments
400% to 600%, 9999
0 to 50%, 9999
400% to 600%
0 to 50%
1 to 5000mm, 8888, 9999
0 to 1000%
0 to 20s
0 to 100%
0 to 100%
L
function
Initial Value
0.01%
500%
0.1%
9999
0.01%
400%
0.1%
1%
1mm
160mm
1%
60%
0.001s
2s
0.1%
2.5%
0.1%
2.5%
3
39
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