Lenze 4800 Manual page 311

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Selection aid
Compensation of friction, acceleration and breakaway torque
The friction can be compensated as function or from a table with 16 values as
function of the torque. The required acceleration torque can be adjusted by
entering the material data (width and density) or via terminals. The breakaway
torque can be added to the torque as offset percentage through an adjustable
time (0 to 5 s).
Digital detection of speed and material speed
A conventional adjustment is not necessary. Simply enter the machine data such
as minimum diameter, gearbox factors, maximum line speed, motor data
according to nameplate, etc. The actual diameter, actaul tension and actual
torque, etc. are indicated in the corresponding codes. These values can also be
read from an analog output.
Integrated tension controller
An integrated tension controller, which can be configured for tension measuring
rollers or dancers, enable a constant tension according to a preselected
set-value. With an analog output, this tension set-value as control signal can be
used as variable for the dancer tension when being converted by an I-p converter
(important for winding with characteristic). The output signal of the tension
controller can be added to the torque or speed with or without diameter evaluation
(adaptation of the tnesion controller with the diameter).
Tables
In addition to the tables for characteristic and friction, there are tables for 16
different initial diameters as well as 16 fixed set-values for circumferential speed
(fixed set-values evaluated with the diameter).
Consideration of the dancer deflection
With diameter calculation, the dancer deflection can be considered as path
change. By this, the dancer movement can reduce the positive feedback.
48XX/49XXSHB0399
15-19