Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 114)

Section 3A
Primary 9/230 Components
3A-31
The digital servo motors are used to drive the axes of the digital servo
drive system. The digital servo motors have a feedback device mounted on
them that provides position and velocity data to the servo module. This
motor mounted feedback device must never be removed from the digital
motor. Even a slight change in the feedback devices orientation relative to
the motor shaft will cause improper motor commutation. This motor
mounted feedback device provides the control with velocity and motor
commutation information. It is also typically used for position feedback.
A second feedback device can be mounted directly on the axis (such as a
linear slide) to provide greater precision for positioning feedback. On
these systems with multiple feedback devices, the motor mounted feedback
must still be used for motor commutation and velocity feedback.
The digital servo motors that the 8520 9/230 Digital CNC supports are
listed in the appendix titled Digital Motor Dimensions. This appendix lists
all compatible 8520 series motors in two sections. The first section lists
motors that include holding brakes, and the second section list motors
without holding brakes.
The 1394 9/230 Digital CNC supports 1326 digital servo motors. For more
information on this Allen-Bradley family of motors, refer to the 1326AB
Torque Plus Series Servomotors Product Data, publication 1326A-2.9.
3A.7.5
Digital Servo Motors