Rockwell Automation 9329 Drive Application Software Inertia Comp Imperial Units User Manual
Page 14
FM – Inertia Compensation
Drive Application Software – page 14 of 28
4.4.1 LineSpdRf_FPM
This input parameter is the line speed reference in FPM.
Usage – Set equal to the line speed reference in FPM.
4.4.2 LineSpdRfRate_FPM
This input parameter is the rate of change of line speed reference in FPM/second.
Usage – If available, set equal to the line speed reference rate, originating in the
same routine as LineSpdRf_FPM.
4.4.3 JDiffEnbl
This input parameter enables the internal line speed reference differentiator.
Usage – Set true only if a separate LineSpdRfRate_FPM signal is not available.
4.4.4 JDiffSamples
This input parameter is the number of moving average samples used to filter output
of the internal line speed reference differentiator.
Usage – Not used when JDiffEnbl is false. Set to a value between 1 and 20 samples.
Similar to a low pass filter, increasing the number of samples increases the filtering
effect.
4.4.5 BuildUpRatio
This input parameter is the build-up ratio or normalized roll diameter.
Usage – For center winder applications, from the Diameter Calculator Function
Module return parameter of the same name. For constant diameter applications,
typically set to 1.0.
4.4.6 Constant_RPMperFPM
This input parameter is the translational-to-rotational conversion constant in
RPM/FPM.
Usage – For center winder applications, from the Diameter Calculator Function
Module return parameter of the same name. For constant diameter applications,
calculate per the following equation:
4.4.7 J_sec
This input parameter is the normalized total reflected inertia.
Usage – For center winder applications, use the JCalc routine return parameter of the
same name. For constant diameter applications, use the value returned from drive
self-tuning function or calculate the value using the following equation:
[ ]
in
er
RollDiamet
GearRatio
PMperFPM
Constant_R
×
=
12
π
d_lbft
MtrTrqRate
_RPM
MtrSpdBase
a
ctedInerti
TotalRefle
J_sec
Ч
Ч
=
308