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Features
The FR-A800-R2R inverter offers four types of control functions which enables the use in various system applications such
as winding/unwinding in the wire drawing machines and printers.
1
Dancer feedback
speed control
The torque is controlled for keeping a constant tension on the workpiece (winding/unwinding shaft) by using the tension
sensor and line speed information.
Further stable torque control is possible by changing the torque command according to the acceleration/deceleration
torque calculation at a speed change (inertia compensation) and the mechanical loss torque compensation, as well as the
compensation determined by the winding diameter calculation.
Tension sensor feedback torque control can be used when the PLC function is enabled. (Refer to page 18.)
Nip roll
Actual line speed
Motor speed
Inertia compensation acceleration/deceleration signal
Tension command (programmable controller)
12
Wide range of applications
Tension sensor
feedback speed control
Speed
detector
Example of tension sensorless torque control
Tension sensorless
torque control
Functions integrated into the inverter
Actual
Winding diameter
line speed
calculation
Tension
Taper setting
command
Mechanical loss
Motor speed
torque calculation
Tension sensor feedback
torque control
Acceleration/
deceleration torque
(inertia compensation)
Tension control
Torque control
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