Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 193)

Section 4B
Connecting the 3-axis Servo Module
4B-47
If the previous procedure is not performed correctly, inconsistent homing
of the axis may occur. If your encoder phasing cannot provide an interval
at which the marker and both channels are simultaneously true, the encoder
should be considered incompatible with the control.
Important: Since positive and negative axis directions can be assigned
without regard to encoder rotation directions, it is possible for the feedback
direction to be “backwards”. This is easily corrected before attempting to
command axis motion through the AMP parameter Sign of Position
Feedback. Refer to the 9/Series CNC 9/230,9/260, and 9/290 AMP
Reference Manual, publication 8520-6.4, for more information.
Wiring Power for your Feedback Device (Analog Systems Only)
The control supports feedback devices with 5v compatible output signals.
The voltage that these feedback devices require may vary. The analog
servo module is equipped to supply 5V dc or 15V dc power to feedback
devices. These voltages may be accessed directly from the encoder
termination panel . For more information refer to page 7A-8.
Important: Be aware that if the 5V dc encoder power is to be used the
connector P3 on the servo module must be directly connected to the power
supply. Refer to page 4D-4 for details on this power supply connection.
If your feedback device requires an external power supply, you can
incorporate it through the EXT. POWER connector on the termination panel.
Power outputs through the ENC POWER connector terminal labeled
EX PWR OUT. The next figure shows the termination panel connection for
EXT. POWER.
Figure 4B.38
Wiring Optional Customer Supplied Power Supply for Feedback Devices
Te
rm
Pa
ne
l
EXT.
POWER
EXT PWR IN
EXT RET IN
Optional
Customer Supplied
Power Supply
External Power
Ground
Shield
11308-I