Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 696)

Integrating a Split Axis with Deskew
Section 14B
14B-2
Skew is the difference between the position of the split axis master servo
and the split axis slave servo. If the skew is too large, the axis or its drive
components may be damaged due to mechanical binding.
To minimize axis skew, there are a number of “Deskew” parameters that
are configured through AMP. The Deskew parameters are used to assign
the master and slave axes, and to prevent damage from axis misalignment.
Wire the servos motors of the split axis up to the servo module ports as
defined in AMP. Wiring requirements are outlined starting on page 7A-1
of this manual. When configuring servo ports keep the following in mind.
If then the slave and the master servo
A spindle is
configured to a
port:
must be connected to the port directly before the
spindle (spindle must be last port used on a
system)
can be connected to any port before the
slave port
A spindle is not
configured to a
port:
must be connected to the last port used in the
system
can be connected to any port before the
slave port
Port configuration is defined in AMP with the servo parameters. Your
wiring must match your AMP configuration. Servos are designated as
slave or master axes through the AMP Deskew parameters.
An example of the port assignments for a three axis system with a spindle
and a split axis is shown below. This configuration uses two analog servo
modules so that there are enough ports to provide output to the drives for
the master and slave servo motors that move the X axis.
Port
Connector
Axis Name
(name of
servo)
Configuration
J1 X Configured as Deskew Master Servo Name
J2 Y Normal Servo Configuration
J3 Z Normal Servo Configuration
J1
(second module)
U Configured as Deskew Slave Servo Name
J2
(second module)
C Configured as Spindle
14B.1
Split Axis
Servo Connections