GE AV-300i, Руководство пользователя, Страница: 161 / 296

AV-300i Version 2 User’s Guide
—————— Function Description ——————
Ch.1
161
Select PID inp FF src = An inp 2 output
Connect to the speed 1 reference the PID output
Select Speed ref 1 src = PID out mon
Set Ramp out enable = Disable
Connect to the Digital input 1 the input enabling the PID PI Block
Select PID PI enab src = DI 1 monitor
Connect to the Digital input 2 the input enabling the PID PD Block.
Select PID PD enab src = DI 2 monitor
In case just one contact is needed to enable the PI and PD section, it is possible to connect also PID PD enab src
on the digital input 1 as described below.
Select PID PD enab src = DI 1 monitor
Connect to the Digital input 3 the input enabling the diameter calculation Block
Select DiaClc start src = DI 3 monitor
Connect to the digital output 0 the signal stating the end of the diameter calculation
Select DO 0 src = Diacalc active
1.16.3.3 Parameters
Set Full scale spd equal to the motor speed corresponding to 100% of the line speed with a minimum winder
diameter (core). Full scale spd = 2550 rpm
Calculation of the motor speed according to the above stated conditions:
Vp =
π
x
Φ
min x
ω
x R
where:
Vp = winder peripheral speed = line speed
Φ
min = winder minimum diameter [m]
ω
= motor angular speed [rpm]
R = motor-winder reduction ratio
w = Vp / p x
Φ
min x R = 400 / (
π
x 0.1 x 0.5) = 2546rpm = about 2550rpm
Connect
Mlt PI sel 0 = Null
Mlt PI sel 1 = Null
With this configuration it is possible to carry out, via a suitable procedure, the calculation of the starting diam-
eter. Furthermore the last calculated diameter value is kept into memory both if the machine is stopped and if the
switchboard is switched off.
As previously stated, the procedure determines the theoretic multiplicative factor (PI output PID) of the feed-
forward as compared to the calculated diameter, in order to send to the Drive the right value of the angular speed.