Rockwell Automation 8510 AC Spindle Drive System User Manual - Manual (Page 92)

Wiring
Chapter 8
8-88
Orient Feedback Wiring
In most systems, the spindle orient function can be performed in either the
CNC or the spindle drive. If the position control for spindle orient is pro-
vided by the drive, the spindle position feedback must be connected to the
8510 through the 20 pin CN2 connector (see Figure 7.3). The 8510 drive
can use either a conventional optical encoder or the high resolution mag-
netic feedback to provide spindle position feedback. The feedback device
must be mechanically coupled 1:1 to the spindle shaft being positioned.
If an optical encoder is used, it must provide an A, B, and Z channel
output, have a single ended push-pull type output, and use a +12V DC
input voltage. The recommended Allen-Bradley encoder is the 845T series
with a type 3 electrical option and a type 3 signal option. The 845T
encoder provides an MS style connector for the interface.
The high resolution magnetic feedback, from 225,000 to 500,000
counts/turn, consists of a precision gear that must be mounted to the
spindle shaft and a sensor head that mounts to the headstock adjacent to the
gear. Refer to the instructions provided with the feedback sensor for
installation details. The sensor has an integral 2 meter (6 ft.) cable. An
interconnection box with terminal strips or connectors must be mounted in
a convenient location to complete the wiring to the drive. Assure that
continuity of all cable shields is maintained through this box.
Both feedback types are connected to the drive through the CN2 connector,
with a unique set of pins for each feedback device. The required interface
cable type is the same for either device. The recommended cable type is:
Madison # 08CFJ00004 (4 twisted pairs with shield, #24 AWG)
Three termination options are available for the CN2 connector: l) a mating
connector kit, 2) a termination panel, and 3) an interface cable assembly.
There are unique versions of the 2nd and 3rd option for optical encoder
feedback and high resolution magnetic feedback. The following table
shows the function assignment for each of these termination options for the
optical encoder interface. Actual connections to the encoder depend on the
specific encoder chosen and connector type chosen for the encoder.