Torque Compensator

The torque demands for the reel drive are provided with compensation for various friction and inertia components.

The function block must be associated with a particular Diameter Calculator function block via a parameter setting.

Inputs include stiction, static friction, dynamic friction, material width, fixed inertia, and line acceleration rate.

Typical commissioning procedure is as follows;

Setup compensations with no material and diameter held at core;

1. Calibrate Stiction with a zero tension setpoint and a small speed setpoint, e.g. 5%. Slowly increase Stiction until the reel begins to move.
2. Calibrate Static Friction with a zero tension setpoint and a small speed setpoint, e.g. 5%. Slowly increase Static Friction until the surface speed of the reel nearly matches the web roller.
3. Calibrate Dynamic Friction with a zero tension setpoint and 100% speed setpoint. Slowly increase Dynamic Friction until the surface speed of the reel nearly matches the web roller.
4. Calibrate Fixed Inertia
   1. Measure the peak torque indication from the reel speed drive when accelerating at maximum rate.
   2. Calculate Fixed Inertia = (Peak Torque Value) - (Static Friction + Dynamic Friction)

Calibrate Variable Inertia with a full roll.

1. Measure the peak torque indication from the reel speed drive when accelerating at maximum rate to maximum speed.
2. Calculate Variable Inertia = (Peak Torque Value) - (Static Friction + Dynamic Friction) - Fixed Inertia

• Available only in the dw2xx & dw2xx-v2 series products
• Requires library: Winder Control (option -06)
• Firmware versions 0x2001 and later