Rockwell Automation 9329 Drive Application Software Inertia Comp Imperial Units - Manual (Page 13)

FM – Inertia Compensation
Drive Application Software – page 13 of 28
The inertia and losses torque return parameter is computed as the sum of inertia
torque, friction torque and windage torque.
Two conventions are used to avoid confusion when applying signal polarities to
translational speed signals, rotational speed signals, and torque signals.
1. Positive torque produces positive rotational speed
2. Positive rotational speed results in positive line speed
A reverse rotation input parameter, allows the second convention to be reversed. In
other words, positive rotational speed results in negative line speed. This function is
necessary for center winder applications with over wind and under wind capability.
Typically, reverse direction is associated with under wind. With the reverse rotation
input parameter set true, the inertia and losses torque resulting from the line speed
reference must be negated. It is important to note that this negation is only applied to
the per-unit inertia and losses torque return parameter.
Input Parameters
Name Type Range Description
1 LineSpdRf_FPM REAL NA Line Speed Reference
2 LineSpdRfRate_FPMsec REAL NA Line Speed Reference Rate
3 JDiffEnbl BOOL 0 to 1 Enable Differentiator
4 JDiffSamples INT 1 to 20
Number of Differentiator
Moving Average Samples
5 BuildUpRatio REAL NA Normalized Diameter
6 Constant_RPMPerFPM REAL NA
Translational-to-Rotational Conversion
Constant
7 J_sec REAL NA Total Reflected Inertia
8 JGainQuad1Quad2 REAL 0.1 to 3.0
Inertia Compensation Gain
Quadrant 1 and 2
9 JGainQuad3Quad4 REAL 0.1 to 3.0
Inertia Compensation Gain
Quadrant 3 and 4
10 Friction_Pct REAL 0.0 to 50.0 Friction Loss
11 Windage_PctRPM REAL 0.00 to 1.00 Windage Loss
12 MtrTrqRated_lbft REAL NA Rated Motor Torque
13 ReverseRotation BOOL 0 to 1 Reverse Rotation
Return Parameters
Name Type Range Description
1 TrqRfJ_Pct REAL NA Torque Reference Inertia Part
2 TrqRfLoss_Pct REAL NA Torque Reference Losses Part
3 TrqRfJLoss_Pct REAL NA
Torque Reference Inertia and Losses
Part
4 DrvTrqRfJLoss_PU REAL NA
Drive Torque Reference Inertia and
Losses Part