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Such application requires a proportional-integral regulation on the side of the system.
The gains of the different components have to be set, experimentally, with a loaded machine; such tests can be
started with the values stated below:
Set PI P1 gain % = 2%
Set PI I1 gain % = 2%
Set PD P1 gain % = 1%
Use the derivative component as a system "damping" element, by setting for example:
PD D1 gain % = 1%
PD der filter = 20ms
In case a series of cascade references has to be performed for another possible Drive, set PID out mon on an
analog output, for example:
An out 1 src = PID out mon
1.16.4 Parameters Referring to the Function for the Calculation of the Starting Diameter
This function is always necessary when an unwinder has to be controlled or when the starting diameter is unknown.
Set Positioning spd with the rpm value required to perform the dancer starting positioning.
For example:
Positioning spd = 15rpm
The polarity of the reference assigned to Positioning speed is equal (both with a winder or unwinder) to the one
functioning as a winder. If for example an unwinder has to be controlled and the functioning speed reference is
positive, set Positioning spd with a negative value.
Set Max deviation with a value slightly lower than the one corresponding to the position of the maximum
mechanical sealing allowed by the dancer.
During the commissioning it is always necessary to perform the self-tuning of the drive analog inputs; in particu-
lar by self-tuning the analog input 1 with a dancer in a lower limit switch position, this position is automatically
set with a 100% value. Therefore, in order to grant a precise calculation, the value to be set is:
Max deviation = 90 %
Set Gear box ratio equal to the reduction ratio between the motor and the winder:
Gear box ratio = 0.5
Set Dancer constant with a value in mm corresponding to the total accumulation of the material in the Dancer:
Figure 1.16.4.1: Outlining of the Dancer Constant Measurement
AV-300i Version 2 User's Guide
WInder/Unwinder
Dancer
Gear box ratio
One pitch dancer
D L = 160mm
M
Dancer constant = ( D L x
—————— Function Description ——————
Upper limit
switch = +1000 count
Electrical 0
Central position
D L
of working
Lower limit
switch = -1000 count
2) 2
x
= (160 x 2) x 2 = 640mm
Ch.1
163
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