Allen-Bradley 1394 SERCOS, User Manual

Page: 90 / 301

Publication 1394-5.0 — May 2000
4-10 Wiring 1394 GMC and GMC Turbo Systems
Encoder Feedback Wiring
These connectors accept encoder feedback signals from an optional
encoder. Terminal 10 requires a user-supplied, reg5V DC
(
±
5%). We recommend Belden #9728 wire or equivalent. When you
use a 5 volt power supply, there is a maximum distance between the
encoder and 1394 of 12.2 meters (40 feet).
The 1394 interface circuitry requires 0.325A to operate. Any
additional devices connected to the 1394, such as incremental
encoders, may require an additional 0.2A per device to operate.
Check your device for operational requirements.
Make the encoder feedback connections according to the table below.
Connectors are located on the bottom of your system module (refer to
Figure 4.7 for 1394
x -SJT xx -C and -T systems and Figure 4.8 for
1394C-SJT xx -L systems).
To improve the bond between the motor feedback cable shield and the
system module PE ground, a cable shield clamp is included with the
Series C system modules.
Ensure an appropriate amount of the cable insulation and braided
shield is removed from the feedback cable. Place the cable wires and
exposed braided shield into the cable shield clamp and tighten the
clamp screw. Then thread the bracket screw into the bottom of the
system module and tighten. Refer to the figure below for an
illustration.
Figure 4.9
Series C System Module Cable Clamps
For this axis: Connect to this terminal:
0 J3
1 J4
2 J5
3 J10
1394 front view
System module
ground bar
Feedback
cable clamps
Cable Preparation
Clamp Attachment Wiring to System Module
Cable wires
Braided
shield
exposed
Cable
shield
clamp
Motor
cable
Clamp
screw
Bracket
screw
51 mm
(2.0 in.)
1
22 mm
(.875 in.)
1
Dimensions given are approximate and will vary
depending on the specific installation. Keep wires
as short as possible while maintaining adequate
stress relief.
1