GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 279)

DV-300 Adjustable Speed Drives
——— FUNCTION DESCRIPTION ———
6
151
6.16.3.8 Function of calculation for Initial diameter
This function performs a preliminary calculation of the diameter of an unwinder/winder before starting the line.
This allows better control of the system avoiding unwanted balancing of the dancer.
The calculation is based on the measure of the movement of the dancer from the position of lower fullrange to
its central position of work, and on the measure of angular movement of the roll during the initial phase.
n
ote
: The function of initial diameter calculation can be carried out only when the winder/unwinder
are controlled through dancer (no load cell) and the speed feed-back is carried out through
encoder.
The result of the calculation is assigned to the parameter PI output PID, and so it represents the multiplier factor
of the feed-forward, in order to obtain the angular speed reference of the motor.
Its value is universely proportional to the roll diameter.
Diameter
calc st
Minimum diameter
Gear box ratio
Max deviation
Dancer
constant
Positioning spd
PI output PID
Diameter
calc
PID feed-back
after offset
Speed fbk sel
Encoder 1 position
Encoder 2 position
Diameter
calculation
I/O Parameter
Parameter
Internal variable
LEGEND:
Figure 6.16.3.6: Diameter calculation block description
Diameter calc
[794] Diameter calc
[795] Positioning spd [rpm]
[796] Max deviation
[797] Gear box ratio
[798] Dancer constant [mm]
[799] Minimum diameter [cm]
Parameter description No.
Value
Standard
Configuration min max
Factory
American
Factory
European
Diameter calc
Enabled (1)
Disabled (0)
794 0 1 0 0
Positioning spd [rpm] 795 -100 +100 0 0
Max deviation 796 -10000 +10000 8000 8000
Gear box ratio 797 0.001 1.000 1.000 1.000
Dancer constant [mm] 798 1 10000 1 1
Minimum diameter [cm] 799 1 2000 1 1
* This function can be set on a digital programmable input.