Sampling Time And Restricted Increase Of Winding Diameter (Pr. 707, Pr. 771, Pr. 772, Pr. 786); Filter Treatment For Compensated Main Rotation Speed By Winding Diameter Calculation (Pr. 769, Pr. 770) - Mitsubishi Electric FR-A700-A1 Instruction Manual

Winding diameter compensation
function
3.8.7 Sampling time and restricted increase of winding diameter (Pr. 707, Pr. 771, Pr. 772,
Pr. 786)
Parameter
Number
Sampling time for winding
707
diameter calculation
771 r-r' limit value (diameter)
772 r-r' limit disable time
Number of averaging for
786
winding diameter calculation
• 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.
Parameter
Number
769 Filter treatment waiting time
770 Filter time constant
• 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.
V
ω =
πDZ
Main speed
compensation
amount calculation
38
Name Setting Range
0.01 to 1s, 9999
0 to 9.998, 9999
Name
*
Pr. 770 (Filter time constant)
Increments
0.01s
0.001mm
0 to 100s 0.01s
0 to 10 1
Setting Range Increments
0 to 100s
0 to 100s
Pr. 769 (Filter treatment waiting time)
Initial Value Remarks
When 9999, approx.
9999
10ms
When 9999, no
1mm
calculation
0s
4
Initial Value
0.01s 0s
0.01s 0s