Rockwell Automation RDD-B2153 Rotary Direct Drive Bearingless Motors - Manual (Page 6)

6 RDD-Series Rotary Direct Drive Bearingless Motor Installation Instructions
Publication RDB-IN001A-EN-P — October 2009
Build and Route Cables
Knowledgeable cable routing and careful cable construction improves system
performance.
Follow these guidelines to build and install cables:
• Keep wire lengths as short as physically possible.
• Route noise sensitive wiring (encoder, serial, I/O) away from input power
and motor power wiring.
• Separate cables by 0.3 m (1 ft) minimum for every 9 m (30 ft) of parallel
run.
• Ground both ends of the encoder cable shield and twist the signal wire
pairs to prevent electromagnetic interference (EMI) from other equipment.
ATTENTION
Do not tightly gather or coil the excess length of a power cable. Heat is generated within a
cable whenever power is applied. Always position a power cable so it may freely dissipate
any heat.
A power cable should not be coiled, except for temporary use when building or testing a
machine. If you temporarily coil a power cable, you must also derate the cable to meet
local code or follow an authoritative directive, such as Engineering Section 310.15(C) of
the NEC Handbook.
Failure to observe these safety procedures could result in personal injury or equipment
damage.