Rockwell Automation 20D PowerFlex 700S AC Drives with Phase II Control Reference Manual - Manual (Page 97)

Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011 97
Detailed Drive Operation Chapter 1
loop can be scaled to different units other than feedback counts, for example,
degrees or inches. Typical applications for the point to point function would be
turn tables and storage retrieval machines.
Speed Reference Selection
The speed reference should be set to zero speed when using point to point
positioning. For example, set parameter 27 [Speed Ref A Sel] = 0 “Zero Speed.”
Enabling the Position Loop
The firmware function for the position loop must be turned on by setting
parameter 147 [FW Functions En], bit 16 “PositionCtrl” = 1.
To enable the position loop, set parameter 151 [Logic Command], bit 13
“PositionEnbl” = 1.
Then to allow the output of the position loop to trim the speed set parameter 740
[Position Control], bit 1 “Speed Out En” = 1.
Position Reference Selection
For point to point positioning set parameter 742 [Position Ref Sel] = 2 “Pt to Pt”.
Parameter 758 [Pt-Pt Posit Ref ] becomes the reference for the position.
Reference
Selection
(Mode)
758
Pt-Pt Posit Ref
742
Position Ref Sel
Gear Rat
[ N ]
[ D ]
+
Position
Offset
PI
Regulator
Point to
Point
768
PositReg P Gain
762
Position Fdbk
318
Position
Feedback
Selection
Proportional Channel
Posit Spd Output
0
1
749
743
742
Interp Position
Aux Posit Ref
2
758 Pt-Pt Posit Ref
Posit Ref Sel
Selected
Position
Reference