Application examples
212
10.4.4
Tension sensor feedback torque control with
roll diameter compensation for fabric inspection
machines
This is useful for a small winding system formed by the small number of shafts (rollers) and no controllers, for example, a
fabric inspection machine.
As tension of material rolls can be controlled by the R2R inverters only, winding/unwinding of materials is possible without
programmable controllers.
Requirements for this application
Highly responsive tension control using feedback from tension sensors is required for the above-mentioned winding system.
Control overview
The FR-A800-R2R inverter is used for every driving roller in the winding system.
The inverter controls the motor output torque based on tension data fed back from a tension sensor to make fabric tension
constant.
FR-A800-R2R inverters have the following additional functions as compared with the FR-A800 inverter standard models.
Purpose
Feature of inverter
Cost reduction
Tension control with no programmable controllers improves the maintainability of the winding system
and reduces to the total man-hour count to develop the system.
Responsivity enhancement
The responsivity of the R2R inverter performing tension control is high as tension data is fed back to
the inverter directly from a tension sensor.
Additional function
Description
Tension control
The inverter controls the motor output torque according to the changing diameter of a fabric roll to
make fabric tension constant.
Inertia compensation function
Fabric tension is kept constant by adding the acceleration/deceleration torque even when the
fabric feeding speed increases/decreases.
Mechanical loss compensation
function
The torque command, which is calculated in consideration of the mechanical loss amount, is given
to avoid tension changes due to mechanical losses.
Two-way operation
The operation can be switched automatically between winding and unwinding.
Summary of Contents for A800 Plus Series
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