Winding Taper Function (Pr. 717, Pr. 787, Pr. 788) - Mitsubishi Electric FR-A700-A1 Instruction Manual

4.6.2

Winding taper function (Pr. 717, Pr. 787, Pr. 788)

Parameter
Number
717 Tension command cushion time
787 Taper ratio setting
788 Tapering start diameter
(1) Control block diagram
Winding
diameter
Tension
command T*
Cushion for
tension command
Pr. 717
(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.

T* Taper ratio setting value
T* -

100 (Pr. 720 - Pr. 788 )
Tension command
 Tension command cushion time is the time to reach the 100% torque command.
 Find the torque command T from the taper control output T
The initial winding diameter is the minimum diameter in a winding operation, and the maximum diameter in an unwinding
operation.
Winding diameter

T = T
TP
Initial winding diameter
Name Setting Range
0 to 100%, 9999
0 to 9998mm, 9999
Pr. 787 = "9999"
T * D Pr. 788
Taper ratio setting (D - Pr.788)
100 (Pr. 720 - Pr. 788)
Pr. 788
D

(D - Pr. 788 )
Taper ratio setting (Pr. 787)
(Analog terminal input)
Minimum winding Tapering start diameter
Pr. 788
diameter
Torque command 100%
Torque command value
Details of the tension control
Setting
Increments
0 to 360s 0.01s
0.1%
1mm
Analog terminal input
Pr. 787
(calibrated) Pr. 733
Pr. 787 "9999"
Winding
T
-
+
Unwinding
Tension command value
Taper ratio setting (Pr. 787)
(Analog terminal input)=100%
Winding diameter
Maximum winding
diameter
Tension command cushion time
Pr. 717
and the winding diameter calculation result.
TP
Initial
Remarks
Value
0s
0% 9999: Analog terminal input
9999: Starts tapering from the
9999
minimum winding diameter.
1
Pr. 787
Pr. 721
9999
Tension
command
1
Pr. 720
Pr. 787
= 9999
4
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