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1. General description
1.1 Principle of winding diameter detection
The LE-50PAU-SET tension conntroller can use either one of the following two types of winding diameter
detection methods selectively.
1. Speed / thickness setting method ( sensor-less method )
• The winding diameter D(mm) for case when winding / unwinding the material ( thickness:Tµm ) at line
speed of V(m/min) is given by the following formula;
2
− 4TVt / π --- Unwinding
D= D
4
• If the intial diameter is set to D1( windin ) or D4 ( unwinding ) , and then the material thickness ( t ) and
average speed (V) are set, it is possible to calculate the winding diameter (D) automatically along with
time elapsed, using the above formula.
This is called "Speed / thickness setting method".
• Since it is unable to execute the correct calculation if any error exists in setting, it is necessary to set
D4(winding) and D1(unwindin) for final diamete, to restrict the calculation result.
2. Pulse / thickness setting method ( winding reel sensor method )
The winding reel is prepared with proximity switch in substitute for line speed (V) setting to supply 1 pulse
/ rotation signal to the LE-50PAU. The winding diameter in this case is caluculated automatically, using
the following formula;
Proximity switch
1 pulse / rotation
• If the intial diameter is set to D
it is possible to calculate the winding diameter ( D ) automatically.
This is called "Pulse / thickness setting method".
• Since it is unable to execute the correct calculation if any error exists in thickness setting, it is necessary
to set D
( winding ) and D
4
<Appendix> Taper tension control
The LE-50PAU-SET is also designed as to execute the taper tension control when the winding diameter
is large, in which the operation is performed at smaller tension than that when windin diameter is small,
and it is possible to set two intermediate diameter points as required.
D= D
V(m/min)
Unwinding
V(m/min)
T(µm)
( windin ) or D
1
(unwinding ) for final diameter, to restrict the caluculation result.
1
2
+ 4TVt / π
---- Winding
1
T(µm)
Winding
Winding
D=D
+ 2NT x 10-3
1
Unwinding D=D
- 2NT x 10-3
4
Where,
N : Count value of winding reel pulse
D : Current winding diameter (mm)
D
: Initial winding diameter (mm)
1
T : Material thickness (µm)
( unwinding ), and then the material thickness ( T ) is set,
4
25
D
= Minimum diameter (mm)
1
D
= Maximun diameter (mm)
4
t = Operation time (min.)
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