61
Details of the tension control
4.6.2
Winding taper function (Pr. 717, Pr. 787, Pr. 788)
(1) Control block diagram
(2) Operation/setting procedure
Find the winding diameter by the winding diameter calculation, and set a tension to be applied at the winding diameter, as a
taper ratio.
The tension command at the minimum winding diameter is 100%. Set how much to loosen the tension at the maximum
winding diameter, as a taper ratio in percent.
When
Pr. 787
"9999", the taper ratio is the setting value of
Pr. 787
.
When
Pr. 787
= "9999", the taper ratio is the analog terminal input (selected among terminals 1, 2, 4, and 6).
When the taper ratio = 0%, the material is winded at a constant tension through the minimum winding diameter
(Pr. 721)
to
the maximum winding diameter
(Pr. 720)
.
Taper control is enabled at
Pr. 788
setting value or higher.
Tension command cushion time is the time to reach the 100% torque command.
Find the torque command T from the taper control output T
TP
and the winding diameter calculation result.
The initial winding diameter is the minimum diameter in a winding operation, and the maximum diameter in an unwinding
operation.
Parameter
Number
Name
Setting Range
Setting
Increments
Initial
Value
Remarks
717
Tension command cushion time
0 to 360s
0.01s
0s
787
Taper ratio setting
0 to 100%, 9999
0.1%
0%
9999: Analog terminal input
788
Tapering start diameter
0 to 9998mm, 9999
1mm
9999
9999: Starts tapering from the
minimum winding diameter.
T* -
T*
Taper ratio setting value
(D -
Pr. 788
)
100
(
Pr. 720
-
Pr. 788
)
T = T
TP
Winding diameter
Initial winding diameter
Winding
diameter
Tension
command T*
Cushion for
tension command
Taper ratio setting (D -
Pr.788
)
100 (
Pr. 720
-
Pr. 788
)
Pr. 721
1
Pr. 720
1
Winding
Unwinding
Pr. 717
D
Pr. 788
D
Pr. 788
Pr. 787
9999
Pr. 787
= 9999
Tension
command
Analog terminal input
(calibrated)
Pr. 733
Pr. 787
Pr. 787
=
"9999"
Pr. 787
"9999"
T*
T
+
-
Minimum winding
diameter
Maximum winding
diameter
Tapering start diameter
Pr. 788
Winding diameter
Tension command
Taper ratio setting
(Pr. 787)
(Analog terminal input)
Taper ratio setting
(Pr. 787)
(Analog terminal input)=100%
Tension command value
Torque command value
Tension command cushion time
Pr. 717
Torque command 100%