Rockwell Automation MD65 User Manual Version 2.0 - Manual (Page 33)

Installing Power Wiring 5-9
Shielded cable may also help reduce shaft voltage and induced
bearing currents for some applications. In addition, the increased
impedance of shielded cable may help extend the distance that the
motor can be located from the drive without the addition of motor
protective devices such as terminator networks.
Consideration should be given to all of the general specifications
dictated by the environment of the installation, including
temperature, flexibility, moisture characteristics and chemical
resistance. In addition, a braided shield should be included and be
specified by the cable manufacturer as having coverage of at least
75%. An additional foil shield can greatly improve noise
containment.
A good example of recommended cable is Belden 295xx (xx
determines gauge). This cable has four XLPE insulated conductors
with a 100% coverage foil and an 85% coverage copper braided
shield (with drain wire) surrounded by a PVC jacket.
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 four 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.
Refer to table 5.5 for acceptable shielded motor cable types.
.
Table 5.5 – Shielded Motor Cable Types Acceptable for 200-600 Volt Installations
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 land 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