Material Properties; Line Speed; Threading - ABB ACS880 Firmware Manual

48 Winder program features

Material properties

Settings based on material properties (thickness, width, density etc.) are required to
achieve better control accuracy in the control program.
Settings
Parameter group 74 Application setup

Line speed

Line speed is the operational speed of the controlled process, given in meters per
minute (or ft/min). Because the roll radius of winders and unwinders keeps changing,
the speed reference to the motor is automatically corrected according to the actual
radius of the driven roll.
See also the Virtual roll control chain diagram
Settings
Parameter groups
selection (page 249)

Threading

Threading function works similar to Jog function. The difference is that in Threading
mode, reference is given in surface speed units (m/min or ft/min). The program
considers the actual roll diameter for determining the target motor speed reference.
Unlike the original Jog mode, Threading function also requires the drive start
command to be given after the threading forward or reverse command is set On. The
transition between threading and normal production modes is done automatically. As
soon as line speed reference goes greater than the threading speed reference, the
control program automatically switches to tension control mode, that the application
is configured to run in. This function is useful when it is needed to pick up a slack in
the material and then immediately switch to production.
If tension control is On, then tension reference signal is considered and applied to the
motor torque limit to prevent the material from breaking at the moment when slack is
removed and it gets tense.
Note: Because surface to motor speed and tension to torque calculation depends on
the actual diameter reading, the accuracy of the final used motor speed and torque
limit highly depends on the accuracy of actual diameter calculation.
Settings
Parameter group 75 Winder speed settings
75 Winder speed settings
(page 415)
on page 62.
(page 419), 22 Speed reference