Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual - Manual (Page 33)

Rockwell Automation Publication 520-UM001G-EN-E - September 2014 33
Installation/Wiring Chapter 1
Other types of shielded cable are available, but the selection of these types may
limit the allowable cable length. Particularly, some of the newer cables twist 4
conductors of THHN wire and wrap them tightly with a foil shield. This
construction can greatly increase the cable charging current required and reduce
the overall drive performance. Unless specified in the individual distance tables as
tested with the drive, these cables are not recommended and their performance
against the lead length limits supplied is not known.
Reflected Wave Protection
The drive should be installed as close to the motor as possible. Installations with
long motor cables may require the addition of external devices to limit voltage
reflections at the motor (reflected wave phenomena). Refer to Reflected Wave in
“Wiring and Grounding Guide, (PWM) AC Drives,” publication
DRIVES-
IN001 .
The reflected wave data applies to all carrier frequencies 2...16 kHz.
For 240V ratings and lower, reflected wave effects do not need to be considered.
Output Disconnect
The drive is intended to be commanded by control input signals that will start
and stop the motor. A device that routinely disconnects then reapplies output
power to the motor for the purpose of starting and stopping the motor should
not be used. If it is necessary to disconnect power to the motor with the drive
outputting power, an auxiliary contact should be used to simultaneously disable
drive (Aux Fault or Coast to Stop).
Recommended Shielded Wire
Location Rating/Type Description
Standard (Option 1) 600V, 90
°C (194 °F) XHHW2/RHW-2
Anixter B209500-B209507, Belden
29501-29507, or equivalent
• Four tinned copper conductors with XLPE insulation.
• Copper braid/aluminum foil combination shield and
tinned copper drain wire.
• PVC jacket.
Standard (Option 2) Tray rated 600V, 90
°C (194 °F)
RHH/RHW-2 Anixter OLF-7xxxxx or
equivalent
• Three tinned copper conductors with XLPE insulation.
• 5 mil single helical copper tape (25% overlap min.)
with three bare copper grounds in contact with shield.
• PVC jacket.
Class I & II;
Division I & II Tray rated 600V, 90
°C (194 °F)
RHH/RHW-2 Anixter 7V-7xxxx-3G or
equivalent
• Three bare copper conductors with XLPE insulation
and impervious corrugated continuously welded
aluminum armor.
• Black sunlight resistant PVC jacket overall.
• Three copper grounds on #10 AWG and smaller.