GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 290)

GEI-100332Ga
——— FUNCTION DESCRIPTION ———
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To set the feed-forward on an analog input, seeing that this one is not directly accesible in the list of high-priority
parameters, it is necessary to pass through a supporting parameter PAD 0.....PAD 15.
Analog input 2 / Select input 2 = PAD 0
Set Digital input 1 as enabling input of the PI block of the PID
Digital input 1 = Enable PI PID
Set Digital input 2 as enabling input of the PI block of the PID
Digital input 2 = Enable PD PID
Set Digital input 3 as enabling input of the calculation function of initial diameter.
Digital input 3 = Diameter calc
Set Digital output 1 as signalling “ phase of calculation of starting diameter “.
Digital output 1 = Diameter calc st
parameters
Set Speed base value equal to the rated speed of the motor.
Speed base value = 3000rpm
Set PID source as PAD 0.
(PAD 0 has been used as supporting parameter of the feed-forward reading on Analog input 2)
For PID source, set the parameter number to which it will be associated, choosing it from the list of the para-
graph 10.4. “List of high-priority parameters” (PAD 0 had the decimal number 503). To obtain the correct value
it must be added the decimal number 8192 (fixed offset):
PID source = (8192 + 503) = 8695
Set Gain source and PID out scale so that, the max. analog value on Analog input 2 and without the PID cor-
rection (Enable PI PID e Enable PD PID = Disable), the peripheral speed of the swift in conditions of minimum
diameter (soul) is the same of the max. line speed.
Calculation of the motor speed in the condition above mentionned:
Vp = π x Φmin x ω x R
where:
Vp = peripheral speed of the coil = line speed
Φ
min
= min. diameter of the coil [m]
ω = angular speed of the motor [rpm]
R = reduction ratio motor-coil
ω = Vp / π x Φ
min
x R = 400 / (π x 0.1 x 0.5) = 2546rpm = about 2550rpm