Rockwell Automation Publication 750-IN001O-EN-P - October 2014 21
Prepare for Installation Chapter 2
Installation Requirements Related to EN 61800-3 and the EMC
Directive
• The drive must be earthed (grounded) as described in Power Wiring on
page 145.
• Output power wiring to the motor must employ cable with a braided
shield providing 75% or greater coverage, or the cables must be housed in
metal conduit, or equivalent shielding must be provided. Continuous
shielding must be provided from the drive enclosure to the motor
enclosure. Both ends of the motor cable shield (or conduit) must terminate
with a low-impedance connection to earth.
Wall Mount Drive Frames 1…7: At the drive end of the motor cable, either
a. The cable shield must be clamped to a properly installed “EMC plate”
for the drive. Kit number 20-750-EMC1-Fx.
or
b. The cable shield or conduit must terminate in a shielded connector that
is installed in a conduit plate or conduit box that is provided in the
“NEMA Type 1 Kit” for the drive (kit number 20-750-NEMA1-Fx).
Floor Mount Drive Frames 8 and larger: At the drive end of the motor
cable, terminate the shield at the PE Grounding Bar (See page 156
).
• At the motor end, the motor cable shield or conduit must terminate in a
shielded connector which must be properly installed in an earthed motor
wiring box that is attached to the motor. The motor-wiring box cover must
be installed and earthed.
• All control (I/O) and signal wiring to the drive must use cable with a
braided shield providing 75% or greater coverage, or the cables must be
housed in metal conduit, or equivalent shielding must be provided. When
shielded cable is used, the cable shield is terminated with a low-impedance
connection to earth at only one end of the cable, preferably the end where
the receiver is located. When the cable shield is terminated at the drive
end, it can be terminated either by using a shielded connector with a
conduit plate or conduit box, or the shield can be clamped to an “EMC
plate.”
• Motor cables must be separated from control and signal wiring wherever
possible.
• Maximum motor-cable length must not exceed the maximum length that
is indicated in Tab le 1
for compliance with radio-frequency emission
limits for the specific standard and installation environment.
• EMC cores must be applied to input power and motor cables for some
models of the PowerFlex 750-Series drives as indicated in Tabl e 1
.
• The drive must be powered from an earthed supply system such as a TN or
TT system and the PE-A and PE-B jumpers in the drive must be installed
(see Drive Power Jumper Configuration
on page 209).
• IP00 and NEMA/UL Open Type Frame 8 and higher frames must be
installed in suitable supplementary EMC enclosures to achieve compliance
with EN 61800-3.
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