ABB ACS880 Firmware Manual page 33

Tension torque trim
In this mode load cell feedback is required. The tension of the web is controlled by
calculating the torque reference of the motor, which is the product of the user-given
tension reference and the actual roll radius. In addition, the tension control PI modifies the
final motor torque reference based on the tension feedback from the load cell. Configure
the following settings:
Set the tension control mode to
torque trim.
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 tension.
Note: Reference scaling could be set to 0,
then input from parameter
interpreted directly in tension units without
any scaling.
Select the source for the tension feedback
signal.
With load cell feedback device the incoming
signal is interpreted directly in force units
without any scaling. Value read by the drive
could be seen in signal
measurement.
Define the maximum tension to exert on the
material.
Define the amount of allowed correction to
the torque reference by the PID controller
output.
Define the tension controller P-gain.
Define the tension controller integration time.
Tension speed trim
In this mode load cell feedback is required. The tension of the web is controlled by
calculating the torque reference of the motor, which is the product of the user-given
tension reference and the actual roll radius. In addition, the tension control PI modifies the
final motor speed reference based on the tension feedback from the load cell. Configure
the following settings:
Enable tension control.
Set the tension control mode to
speed trim.
Start-up guide for ACS880 winder control program 33
Tension
scaling.
= (77.03 Tension
77.03 is
77.70 Load cell
Tension
77.02 Tension control mode
77.03 Tension reference Src
77.04 Load cell feedback Src
77.05 Max tension
78.09 PID output range
78.11 P-gain 1
78.12 I-time 1
77.01 Enable tension control
77.02 Tension control mode