Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 68)

68 Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014
Chapter 4 Best Practices
Cable Trays When laying cable in cable trays, do not randomly distribute them. Bundle the
power cables for each drive together and anchored them to the tray. Keep a
minimum separation of one cable width between bundles to reduce overheating
and cross-coupling. Current flowing in one set of cables can induce a hazardous
voltage and/or excessive noise on the cable set of another drive, even when no
power is applied to the second drive.
Figure 31 - Recommended Cable Tray Practices
Maintain separation between power and control cables. When laying out a cable
tray for large drives, make sure that the cable tray or conduit containing the signal
wiring is separated from the conduit or trays containing power or motor wiring
by 1 m (3.2 ft) or more. Electromagnetic fields from power or motor currents can
induce currents in the signal cables. Dividers also provide excellent separation.
IMPORTANT Carefully arrange the geometry of multiple cable sets. Keep conductors within
each group bundled. Arrange the order of the conductors to minimize the
current that is induced between sets and to balance the currents. This is critical
on drives with power ratings of 200 Hp (150 kW) and higher.
Bundled and Anchored
to Tray
T PE
R S
T PE
R S
T PE
R S
T PE R S S R PE T
Recommended
Arrangements for
Multiple Cable Sets