Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 697)

Integrating a Split Axis with Deskew
Section 14B
14B-3
The start up procedure for a split axis requires that both servos be tested
separately. This means mechanically disconnecting the drive train of both
servos and temporarily redefining them as independent axes in AMP. This
can be done by setting the master and slave servo names in the AMP
Deskew parameter group to “none”. Remember, AMP changes can be
made either in ODS or through Patch AMP.
Once you have disconnected and redefined the split axis servo motors,
perform the Initial Control and Servo Start Up Procedures starting on
page 14A-1.
ATTENTION: Do not perform any homing operations during
this start up procedure. Special homing considerations are
given in the following section.
At step 18. of the start up procedure (on page 14A-6) you are instructed to
complete the homing marker alignment if you are working on a split axis.
At that point, return to the alignment procedure starting on page 14B-3 of
this section. After you complete the marker alignment, you can return to
step 19. (on page 14A-6) and complete the start up procedure.
To assure that minimal skew exists between servos of a split axis it is
imperative that as small amount of skew as possible exists after the axes
are homed. Once homed with minimal skew, the control can make sure the
master and slave servo’s positions relative to each other remains constant.
This requires that both servos of a split axis return to the same repeatable
home position.
ATTENTION: Do not attempt to perform this procedure until
the normal start up procedure has been started as discussed in
the previous section.
At this point, you should have completed through step 18. of the start up
procedure in 14A-6. You should have mechanically reconnected both
servo motors to the axis and redefined those servos as master and slave
using the AMP Deskew parameters.
Both servos of a split axis home off of the same single home switch. The
homing sequence is almost the same for an axis with deskew as it is for a
single servo axis. The axis moves to the switch, stops, moves off of the
switch in the AMP specified direction, stops again, and then moves to the
nearest encoder null marker.
14B.2
Split Axis
Start up Procedure
14B.3
Split Axis
Marker Alignment