Rockwell Automation 20D PowerFlex 700S with Phase I Control Reference Manual - Manual (Page 90)

90 Rockwell Automation Publication PFLEX-RM002D-EN-E - August 2013
Chapter 1 Detail Drive Configuration and Operation
Position Offset
Offsets can be added to the position reference. Offset are used to make a
correction move to sync the follower to the master position.
There are two offsets, parameters 753 [Posit Offset 1] and 754 [Posit Offset 2].
The offset speed must be entered in parameter 755 [Posit Offset Speed] - if this is
left at zero the move will not occur. The position offset must be entered in counts
of feedback because it is added to the position reference after the EGR scaling.
Offsets must be maintained to keep the position. In other words, if you enter a
300 in the offset the position loop will move 300 counts extra. If you zero the
offset command the motor will return to the previous position. When it is
necessary to zero the offset after a move without returning to the previous
position, set parameter 740 [Position Control] bit 5 “Xoff ReRef ” =1. Then set
the offset value = 0. Then set [Position Control] bit 5 “Xoff ReRef ” = 0. The
system will not make an offset move when [Position Control] bit 5 “Xoff ReRef ”
is on.
+
Rate Lim
753
754
755 LPass
Filter
756
Posit Offset 1
Posit Offset 2
Posit Offset Spd
Position Control
(X Offset Pol)
Position Control
(X Offset Ref)
Deriv
Δ
740 04
740 05
741 05
Position Status
(X OffRefActl)
Added to position
reference after
EGR