gefran TPD32-EV-...-2B, Instructions Manual

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307
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 10.2. “ 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 roll in conditions of minimum
diameter (core) is the same of the max. line speed.
Calculation of the motor speed in the condition above mentionned:
Vp = π x Φ min 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
Mantaining a 15% margin as to the saturation limit of the regulator (10000 count), it is necessary to set PID
source Gain so that Feed-fwd PID reaches, along with the max. analog value on Analog input 2 , 85% of its
max. value.
When an analog input is set on a PAD parameter , this will have a max. value +/- 2047.