Rockwell-automation 20D PowerFlex 700S with Phase I Control Reference Instrukcja Użytkownika Pobierz pdf (Strona 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

740 04

740 05

741 05

Position Status

(X OffRefActl)

Added to position

reference after

EGR

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Rockwell-automation 20D PowerFlex 700S with Phase I Control Reference Instrukcja Użytkownika Strona 90