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Features
The FR-A800-R2R inverter has various dedicated functions such as winding diameter calculation, providing
stable winding/unwinding control independently.
1
Winding diameter calculation
The present winding diameter for
the winding/unwinding shaft is
calculated from the actual line
speed or the actual motor speed.
Line speed command
input selection / actual
line speed input selection
The line speed command and actual line
speed required for calculating the winding
diameter can be input through the analog
input terminal or plug-in option.
Dancer feedback speed control
Tension sensor feedback speed control
PID control is performed using feedback
of the detected dancer roll position or
feedback from the tension sensor. Stable
control can be achieved in combination
with the winding diameter calculation.
Speed control proportional
gain compensation
By adjusting the speed control
proportional gain according to the
winding diameter, the response
level can be kept constant.
8
System simplification
Winding diameter calculation function selection
The winding diameter calculation method can be selected in order to improve the
tension control performance.
•Actual line speed calculation method
The winding diameter is calculated
from the line speed and the main
speed (actual motor speed).
D =
•Thickness calculation method
The material thickness is added up to
find the overall winding diameter.
D = Initial diameter ± 2 × d × N × Z
Tension PI gain tuning
By automatically adjusting the tension
PI gain for PID control, time required for
adjustment is significantly cut down.
Anyone can start the system easily.
Variable
tension
Constant
tension
V
π × n × Z
Vibrated dancer roll
Stabilized
dancer roll
V
d
D: Diameter
n: Motor speed
D
d: Material thickness
V: Line speed
Z
N: Number of rotations
Z: Reduction ratio
Dancer roll malposition detection
When material rupture (break) occurs and
the sensor feedback value (dancer/tension
feedback) is held at the upper/lower limit
for a certain period of time, the break
detection signal is output.
Dancer roll
position
Start
signal
Break
detection
Break detection
signal
time
Example of dancer feedback control (winding)
N
n
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