Rockwell Automation Publication 750-IN100B-EN-P - July 2017 29
Prepare for Installation Chapter 3
Installation Requirements Related to EN 61800-3 and the EMC
Directive
• The drive must be earthed (grounded) as described in Chapter 5.
• 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. At the drive end of
the motor cable, terminate the shield at the PE Grounding Bar. (See
Grounding Requirements starting on page 99
.)
• 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 Table 4
for compliance with radio-frequency
emission limits for the specific standard and installation environment.
• 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
correctly configured (see Drive Power Jumper Configuration on
page 127
).
ATTENTION: PowerFlex 755T products produce DC current in the
protective earthing conductor which can reduce the ability of RCDs
(residual current-operated protective devices) or RCMs (residual
current-operated monitoring devices) of type A or AC to provide
protection for other equipment in the installation. Where an RCD or
RCM is used for protection in case of direct or indirect contact, only an
RCD or RCM of Type B is allowed on the supply side of this product.
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