ABB ACS880 Firmware Manual page 32

32 Start-up guide for ACS880 winder control program
Set the speed reference additive parameters:
Set parameter 75.31 Overspeed ref
that is speed reference additive defined in
percent of maximum line speed (parameter
75.01 Max line speed).
For example, 3...5% is usually enough.
Define the line speed reference ramp settings:
Set parameter 75.11 Acceleration ramp time
in seconds. It defines how fast the line speed
reference increases from 0 to maximum line
speed (parameter
Set parameter 75.12 Deceleration ramp time
in seconds. It defines how fast the line speed
reference decreases from maximum line
speed (parameter
zero.
Note: In case of drive stop command, define
a separate deceleration ramp time with
parameter 75.13 Stop ramp
The parameter settings for each tension control mode depends on the selection mode.
Tension control is enabled with parameter
Open loop
In this mode feedback from the web is not required. The tension of the web is controlled
by calculating the torque reference for the motor, which is the product of the user-given
tension reference and the actual roll radius. The tension control PID is not used.
Configure the following settings.
Set the tension control mode to
(used when feedback devices for tension
control are not available).
Select the source for tension reference.
Tension reference scaling is then done with
parameter 77.06 Tension reference
The target tension reference is then defined
as:
77.51 Tension reference In
reference Src/ 77.06 Tension reference
scaling) * 77.05 Max
Note: Reference scaling could be set to 0,
then input from parameter
interpreted directly in Tension units without
any scaling.
Define the maximum tension to exert on the
material.
offset,
75.01 Max line speed).
75.01 Max line speed) to
time.
Tension control settings
77.01 Enable tension
Open loop
scaling.
= (77.03 Tension
tension.
77.03 is
75.31 Overspeed ref offset
75.11 Acceleration ramp time
75.12 Deceleration ramp time
75.13 Stop ramp time
control.
77.02 Tension control mode
77.03 Tension reference Src
77.06 Tension reference scaling
77.05 Max tension