User Manual Instruction Manual
4-2
GV6000 AC Drive User Manual
Shielded/Armored Cable
Shielded cable contains all of the general benefits of multi-conductor cable with the
added benefit of a copper braided shield that can contain much of the noise generated
by a typical AC drive. Strong consideration for shielded cable should be given in
installations with sensitive equipment such as weigh scales, capacitive proximity
switches, and other devices that may be affected by electrical noise in the distribution
system. Applications with large numbers of drives in a similar location, imposed EMC
regulations, or a high degree of communications/networking are also good candidates
for shielded cable.
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 (4) XLPE insulated conductors with a 100% coverage foil and an 85%
coverage copper braided shield (with drain wire) surrounded by a PVC jacket. See
table 4.1.
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.
Table 4.1 – 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.