38
Winding diameter compensation
function
3.8.7
Sampling time and restricted increase of winding diameter (Pr. 707, Pr. 771, Pr. 772,
Pr. 786)
• Set the sampling time for winding diameter calculation in
Pr. 707
. Set how often winding diameter calculation needs to be
performed.
• To avoid sudden change of calculated winding diameter, amount of change per sampling can be restricted with
Pr. 771
.
• Setting the duration to inactivate
Pr. 771
to
Pr. 772
may be useful to roll up material to the specified winding diameter faster
at an operation start. However, be cautious to use this function because the winding diameter may change drastically
causing dancer roll to swing up and down during the set time in
Pr. 722
.
• When speed ripples happen frequently, set greater number in
Pr. 786
to reduce the influence of speed ripples.
3.8.8
Filter treatment for compensated main rotation speed by winding diameter
calculation (Pr. 769, Pr. 770)
Compensated main rotation speed by winding diameter calculation can be filtered.
• Set a waiting time before applying first-order lag filter to main speed, which is compensated by winding diameter
calculation, in
Pr. 769
after a start.
• In
Pr. 770
, set a filter time constant which will be applied to compensated main rotation speed by winding diameter
calculation . When "0" is set, no filter is applied.
Parameter
Number
Name
Setting Range
Increments
Initial Value
Remarks
707
Sampling time for winding
diameter calculation
0.01 to 1s, 9999
0.01s
9999
When 9999, approx.
10ms
771
r-r' limit value (diameter)
0 to 9.998, 9999
0.001mm
1mm
When 9999, no
calculation
772
r-r' limit disable time
0 to 100s
0.01s
0s
786
Number of averaging for
winding diameter calculation
0 to 10
1
4
Parameter
Number
Name
Setting Range
Increments
Initial Value
769
Filter treatment waiting time
0 to 100s
0.01s
0s
770
Filter time constant
0 to 100s
0.01s
0s
Pr. 769 (Filter treatment waiting time)
Main speed
compensation
amount calculation
ω
=
V
*
π
DZ
Pr. 770 (Filter time constant)
