User guide

WintDrive
Control 1 Description
0
1
otherwise
Functionalities are all enabled: diameter and thickness are estimated from line speed
(LineSpd) and winder motor speed (WMotSpd)
Diameter and thickness estimation are disabled, but diameter is updated according to
actual thickness. This is used during speed match and when torret is rotating. In this
case material path is changing so diameter estimation has to be disabled, however
, diameter is increasing (or decreasing if unwind) of actual thickness.
If thickness estimation is disabled (when Tat11 or Tau2 are set to le9 [set], see
1 below) and thickness is zero (when StartingThickness is set to 0) this case is identi-
cal to Control=2.
’ Functionalities are all disabled: estimated diameter and thickness are constant.
This case is identical to Control=1 when thickness estimation is disabled (when Taul
or Tau2 are set to le9 [set], see below) and thickness is zero (when
StartingThickness is set to 0).
Unwind input indicates direction of winding: rewinder and diameter increase when unwind = 0, unwinder
and diameter decrease when unwind = 1.
Diamobs block can control increment or decrement of diameter according to direction of winding: rewinding
or unwinding. For this porpose IncDecDis (Increment and Decrement Disabling) and Unwind (Unwinder)
inputs are provided. The meanings of these inputs are described in the following table:
IncDecDis
0
Unwind
i3Ily
Description
Estimated diameter is tiee
different from 0
different from 0
0 Estimated diameter can only increase (rewinder)
different from 0 Estimated diameter can only decrease (unwinder)
xvccMn
Diamobs is a algorithm with two time constants: Taul [set] and Tau2 [set]. These inputs determine time that
observer takes to estimate diameter and thickness.
The simplest case is when user needs to estimate only diameter: Tau2 must be set to le9 [set]. Taul [set] is
diameter estimation time constant. It represents the same concept of time constant in electronic analog circuits
and it is equivalent to the product of Resitance and Capacitance. It is the time that estimated value takes to
reach 63% of its steady state value. After four times time constant reaches steady state value (98%).
More complex case is when user needs to estimate both variables: diameter and thickness. This is the case
when material is very thick.
If for example user wants to estimate diameter with a time constant of 2 [set] and thickness with a time
constant of 10 [set], he has to set Taul [set] to 2 [set] and Tau2 [set] to 10 [set] (Tau2 [set] to 2 [set] and
Taul [set] to 10 [set] is exactly equivalent).
In general terms the least value between Taul and Tau2 is the time constant of diameter estimation while the
largest value is the time constant of thickness estimation.
Diamobs can estimate diameter and thickness with accuracy depending on winder motor speed (WMotSpd):
the higer winder motor speed, the more accuracy estimation will be. When winder motor speed is close to
zero, estimations have to stop. For this purpose two winder motor speed thresholds are provided (WMotThrl
and WMotThr2). When WMotSpd is below WMotThrl estimation is disabled. When WMotSpd is above
WMotThr2 estimation is completely enabled. When WMotSpd is between WMotThrl and WMotThd
time constants start very high and decrease until Taul and Tau2 when WMotSpd reaches WMotThrl.
WMotThrl must be below WMotThr2.
WMotThrl and WMoThr2 values depends on speed sensor accuracy and on sample time of the control. The
less accnrate sensor and the shorter sample time, the higher thresholds have to be.
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