ABB ACS880 Firmware Manual page 432

432 Parameters
No. Name/Value
77.11 Taper mode
No tapering
Linear
Arc
Slide
77.12 Tapering reference
signal
NULL
9.12 Actual
diameter %
9.11 Actual
diameter
Other
Description
Selects the used taper mode. The taper function allows
altering the web tension as roll diameter changes. Taper
mode can be used to control the roll hardness and prevent
defects as roll starring and core deformation.
The picture below shows different tension reference profile
shapes associated with a certain taper mode selection.
Tension reference
77.11 Taper mode
100%
0%
77.13 Taper starting point
Taper function is disabled. Tension reference stays the same
all along the production cycle.
Tension reference changes linearly in direct proportion to the
diameter change in the defined tapering range (from
parameter 77.13 Taper starting point
diameter).
Tension reference changes slowly at start and gets more
rapid as actual diameter grows. For the visual representation
of the arc shape profile, see the picture above.
Tension reference changes rapidly at start and gets slower
as actual diameter grows. For the visual representation of
the slide shape profile, see the picture above.
Defines the source for the axis signal that tension tapering
function refers to.
The active tapering range on this axis is then defined with
parameters 77.13 Taper starting point
point.
Zero
Actual diameter displayed in parameter
diameter %.
Actual diameter displayed in parameter
diameter.
Source selection (see Terms and abbreviations
page 152).
= No tapering
77.15 Max
taper
Arc
Slide
100%, full roll
Roll diameter
up to 76.09 Full roll
and 77.14 Taper end
09.12 Actual
09.11 Actual
on
Def/FbEq16
No tapering
0
1
2
3
9.12 Actual
diameter %
0
1
1
-