Rockwell Automation 8720MC High Performance Drives Installation Manual - Manual (Page 65)

Publication 8720MC-IN001D-EN-P — December 2002
Connecting Your 8720MC 3-3
Building Your 8720SM
Motor Cables When building your own cables for use with the 8720SM motors,
follow the guidelines listed below.
• Connect the cable shield to the connector shells on both ends of
the cable with a complete 360° connection.
• Use a twisted pair cable whenever possible, twisting differential
signals with each other, and single-ended signals with the
appropriate ground return.
Note: MP-Series motor cables are factory supplied. Contact your local
Allen-Bradley representative for latest availability.
Shielded Motor Cable
The use of a four-wire type VFD, 600 volt, UL listed cable is strongly
recommended for all motor currents at or below 130 amperes. Figure
3.1 illustrates the type of cable required.
Figure 3.1
Required Cable Type
You should always use shielded motor cable. You must connect the
shield to the drive chassis (PE) connection and the motor frame. Make
the connection at both ends to minimize the external magnetic field.
If you use cable trays or large conduits to distribute the motor leads
for multiple drives, use shielded cable to reduce or capture the noise
from the motor leads and to minimize cross coupling of noise
between the leads of different drives.
Oversized XHHW-2 insulation
Tinned copper
braid 85% coverage
Foil sheild
Stranded tinned
copper conductors
FRPVC jacket (sun res.)
Variable Frequency Drive Cable
4 Condutor 600V
Stranded drain wire