Tension Sensor Feedback Torque Control With Roll Diameter Compensation For Fabric Inspection Machines - Mitsubishi Electric A800 Plus Series Function Manual

Application examples
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.
Purpose
Cost reduction
Responsivity enhancement
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.
Additional function
Tension control
Inertia compensation function
Mechanical loss compensation
function
Two-way operation
212
APPENDIX
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.
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.
The inverter controls the motor output torque according to the changing diameter of a fabric roll to
make fabric tension constant.
Fabric tension is kept constant by adding the acceleration/deceleration torque even when the
fabric feeding speed increases/decreases.
The torque command, which is calculated in consideration of the mechanical loss amount, is given
to avoid tension changes due to mechanical losses.
The operation can be switched automatically between winding and unwinding.
Feature of inverter
Description