GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 292)

GEI-100332Ga
——— FUNCTION DESCRIPTION ———
6
164
where:
ω
max
= angular speed of the motor in conditions of min. diameter [rpm]
ω
min
= angular speed of the motor in conditions of max. diameter [rpm]
Vl = line speed
Φ
min
= min. diameter of the core[m]
Φ
max
= max. diameter of the core[m]
R = gear reduction ratio motor-winder/unwinder
So: ω
max
/ ω
min
= Φ
max
/ Φ
min
from which
ω
min
= (Φ
min
/ Φ
max
) x ω
max
Considering that the parameters PI top lim and PI bottom lim can be seen as multiplier factors of min. and
max. of the feed-forward.
Multiplying the feed-forward by PI top lim = 1, gives the max. speed reference concerning the minimum
diameter.
Multiplying the feed-forward by PI bottom lim = 0.14, gives the min. speed reference concerning the max.
diameter.
This application operates by using the proportional-integral regulation.
The gains of a single component will be experimentally set with a loaded machine. It is possible to begin the
tests with the values below:
Set PI P gain PID = 15%
Set PI I gain PID = 8%
Set PD P gain PID = 5%
In this case, use the derivative component for forcing the regulator output during velocity changes of the system.
Programming for example:
PD D gain PID = 20%
PD D filter PID = 20ms
In case it is necessaryto carry out a reference cascade for another drive, program PID output on an analog
output, for example:
Analog output 1 / Select output 1= PID output
(with Real FF PID = 10000 count, Analog output 1 = 10V).
Parameters regarding the calculation function of the initial diameter
This function is always necessary when one has to control an unwinder or when the starting diameter is un-
known.
Set Positioning spd at the value in rpm with which the initial positionning of the dancer has to be done. For
example:
Positioning spd = 15rpm
The polarity of the reference assigned to Positioning speed will be anyway (winder/unwinder) equal to the one
functioning as a winder.
If for example one has to control an unwinder and the speed reference in standard functioning is positive, assign
to Positioning spd a negative value.