Winding Diameter Compensation Function; Winding Diameter Calculation And Winding Diameter Compensation Function - Mitsubishi Electric A800 Plus Series Function Manual

Winding diameter calculation and winding diameter compensation function

8
WINDING DIAMETER COMPENSATION
FUNCTION
The winding diameter calculation is used to estimate the present winding diameter from the actual line speed or the actual
motor speed for the winding/unwinding shaft.
The estimated winding diameter is used to convert the line speed command to the frequency command, or convert the
tension command to the torque command.
Using the winding diameter compensation function under dancer feedback speed control, tension sensor feedback speed
control, tension sensorless torque control, or tension sensor feedback torque control improves control accuracy.
POINT POINT
• To enable the winding diameter compensation function under dancer feedback speed control, tension sensor feedback speed
control, or tension sensor feedback torque control, turn ON the X114 signal and set "40 or 41" in Pr.128 PID action selection.
(When the X114 signal is OFF or "0" is set in Pr.128, the winding diameter compensation function is disabled under dancer
feedback speed control, tension sensor feedback speed control, and tension sensor feedback torque control.)
• Turn ON the X114 signal to enable the sensorless torque control and the winding diameter compensation function. (When the
X114 signal is OFF, the tension sensorless torque control and the winding diameter compensation function are not available.)
• To disable dancer feedback speed control and enable only the winding diameter compensation function, turn ON both X114
and X116 signals, or turn ON the X114 signal and set "9999" in Pr.129, Pr.130, and Pr.134.
• For the X114 and X116 signals, assign the function by setting "114 (X114)" or "116 (X116)" in any of Pr.178 to Pr.189 (input
terminal function selection).
8.1
Winding diameter calculation and winding
diameter compensation function
Winding diameter calculation
• Winding diameter calculation using actual line speed
Calculate the winding diameter "D" from the actual line speed input value "V" and motor speed.
π  D  ωfb  Z = V
D =
(Example) Calculation when line speed (V) = 409.9 m/min, actual motor speed (ωfb) = 659.0 r/min, and gear ratio (Z) = 0.396
D =
• Winding diameter calculation using a sum total of material thickness
Calculate the winding diameter "D" from the wound (unwound) material thickness "d".
D = D1 ± 2  d  N  Z
NOTE
• Use the following values as the actual motor speed according to the control method.
Vector control
Real sensorless vector control
V/F control
Advanced magnetic flux vector control
• To use the motor rotations per minute, setting of Pr.81 Number of motor poles is required also under V/F control. (When
Pr.81 = "9999", a 4-pole motor is assumed.)
158

WINDING DIAMETER COMPENSATION FUNCTION

V : Line speed
ωfb : Actual motor speed
V
Z : Gear ratio
π  ωfb  Z
409.9 [m/min] × 1000
V
=
π × 659.0 [r/min] × 0.396
π  ωfb  Z
D1 : Initial diameter
d : Material thickness
N : Number of roll rotations
Z : Gear ratio
Control method
= 499.97 [mm]
Value used as actual motor speed
Actual motor speed
Estimated value of actual motor speed
Motor rotations per minute (converted from
output frequency)