Rockwell Automation 2090-SRxxx External Shunt Modules Installation Instructions - Manual (Page 11)

Publication 2090-IN004B-EN-P — June 2008
External Shunt Modules 11
Noise Zones for 1394 Drives
Observe these guidelines when mounting your external shunt module
outside the enclosure:
•
Mount circuit components and wiring in the very dirty zone or
in an externally shielded enclosure. Run shunt DC-bus and fan
wiring inside metal conduit to minimize the effects of EMI and
RFI.
•
Mount resistors (other than metal-clad) in a shielded and
ventilated enclosure outside the cabinet.
•
Keep unshielded wiring as short as possible. Keep shunt DC-bus
wiring as flat to the cabinet as possible.
•
Route thermal switch and fan wires separate from shunt DC-bus.
External Shunt Module Mounted Outside the Enclosure
C C
D D
VD
D
C
1394 Digital Servo Controller
300W Shunt Module
BULLETIN 1394 300W SHUNT MODULE ALLEN-BRADLEY
FOR USE WITH 1394-SJT22-X SYSTEM MODULE
CAT. PART SER. INPUT DC INPUT AC FOR FUSE REPLACEMENT USE:
BUSSMAN CAT. NO.
R
Status
DANGER RISK OF ELECTRICAL SHOCK. HIGH VOLTAGE MAY EXIST UP TO FIVE MINUTES AFTER REMOVING POWER.
SERCOS System Module
(1)
Dirty Wireway Clean Wireway
Customer-supplied
Metal Enclosure
Enclosure
Metal Conduit
(where required
by local code)
Route 24V DC I/O
Shielded Cable
Route Encoder/Analog/Registration
Shielded Cable
Very dirty shunt connections
segregated (not in wireway).
24V Motor
Brake PS
Circuit
Breaker
XFMR
AC
Line Filter
DC
Filter
Contactors
1394x-SJT22-x Drive System
I/O and
Feedback Cables
Enclosure
Shunt thermal switch and
fan wires (when exist).
Shunt DC-bus Wiring Methods:
Twisted pair in conduit (1st choice).
Shielded twisted pair (2nd choice).
Twisted pair, 2 twists per foot, min (3rd choice).
150 mm (6.0 in.)
clearance, min on all four
sides of the shunt module.