Mitsubishi LE-40MTA-E - Winding Tension and Taper Control; Control of Excessive Winding Tension

28
7.3 Control of excessive winding tension
Such control as to increase/decrease the working tension, depending on the change in winding diameter
is called "Taper tension control", in which the tension is controlled in accordance with the preset pattern,
to suit the change in winding diameter. This function is mainly used to prevent the material from winding
too tight or too loose on the reel.
Following two methods are peresently available to determine the current reel diameter:
(1) By calculating internal reel diameter.
(2) By entering the reel diameter externally through analog voltage (high precision taper ten sion
control is possible).
In the internal reel diameter calculation, the reel diameter is calculated based on the torque control out-
put. Since it is not necessary to enter the reel diameter, the accuracy is not very high.
Two methods are available to set the taper ratio as follows :
(1) By setting the taper ratio (key entry) internally.
(2) By entering the taper ratio externally through analog voltage.
Two methods are available to enter the taper curves as follows :
(1) Linear line taper control.
(2) Non-linear line taper control.
1. Outline of taper control
Calculation of
internal winding
diameter
Calculation of
linear line
taper
Calculation of
non-linear
line taper
-
Non-linear line
Linear line
Tension
detected
Torque control output
Data table corner 1~4
Taper 1~4
Minimum diameter
Maximum diameter
Internal
tension setting
Internal taper
ratio setting
Selection
P
SA
EAP
AI2
AI3
AI2
AI3 Reel diameter
Taper ratio
Taper reel
diameter
Inside
Outside
Taper to use
/Taper not
to use
Items in square are set
on the panel surface
External taper
ratio setting
External reel
diameter
Target
tension
+
Tension
detected
-
Torque
control output