Compensation Calculator (Torque Compensation); Compensation Of System Losses; Compensation Of Static Frictional Losses - BONFIGLIOLI Vectron ACTIVE CUBE Applications Manual

Voorhout • Groningen • Weert • Hoogerheide
Rated torque M of the machine in [Nm] is calculated from the motor data:
rated
60 · P.376 · 1000
M = ——————————
rated
2 · π · P.372
with P.376 = rated power in [kW]
P.372 = rated speed in [rpm]
5.5

Compensation calculator (Torque Compensation)

The compensation calculator provides the torque required for compensation of losses in the system
and acceleration of the drive. The torque output by the compensation calculator is added to the value
to be output by the speed controller. Thus, it is not subject to the limitations that can be made in the
speed controller.
CAUTION
If the parameters are configured incorrectly, the drive might race. Before commission-
ing, Parameter
sible frequency.
It is important that the parameters be configured in the right order (as described be-
low).
5.5.1

Compensation of system losses

Via Parameters 865 and 866 described in the following, a static and a dynamic (speed-dependent)
value for compensation of system losses is configured. System losses are the components of the
torque to be applied which don't contribute neither to acceleration of the drive nor to building up the
web tension.
5.5.1.1

Compensation of static frictional losses

Static friction mainly occurs in the bearings of the winder shaft, gear box and motor. To compensate
these frictional losses, the torque must produce an additional constant torque. This torque is set via
Static Friction Compensation
Parameter
During commissioning, the value is determined as follows:
• Limit the torque which can be output by the speed controller to 0 by the following parameter set-
tings, see Chapter 5.4 "Limitation of web tension (Tension Setpoint)":
Parameter 860 = 6 – On
−
Parameter 861 = 0%
−
• Start drive at a preset speed (with empty winder).
Increase the value of Parameter 865 carefully until the drive starts turning slowly.
•
Reduce the value of Parameter 865 again slowly until the drive no longer turns.
•
Parameter
No. Identifier
Static Friction Compensation
865
11/13
T
Frequency Switch-off Limit
865 in % of the rated torque of the drive.
Unit
%
ACU
Winding Drive
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417 should be set to the maximum permis-
Setting range
0.00 .. 30.00
Default settings
0.00
35