Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual - Manual (Page 51)

Rockwell Automation Publication 520-UM001G-EN-E - September 2014 51
Installation/Wiring Chapter 1
• PowerFlex 520-series drives produce leakage current in the protective
earthing conductor which exceeds 3.5 mA AC and/or 10 mA DC. The
minimum size of the protective earthing (grounding) conductor used in
the application must comply with local safety regulations for high
protective earthing conductor current equipment.
Installation Requirements Related to EN 61800-3 and the EMC Directive
• The drive must be earthed (grounded) as described in Connections and
Grounding on page 52 . See General Grounding Requirements on page 20
for additional grounding recommendations.
• Output power wiring to the motor must employ cables with a braided
shield providing 75% or greater coverage, or the cables must be housed in
metal conduit, or equivalent shield 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.
Drive Frames A...E: At the drive end of the motor, either
a. The cable shield must be clamped to a properly installed “EMC Plate”
for the drive. Kit number 25-EMC1-Fx.
or
b. The cable shield or conduit must terminate in a shielded connector
installed in an EMC plate, conduit box, or similar.
• 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 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 should be 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 may be terminated either by using a shielded connector in
conjunction with a conduit plate or conduit box, or the shield may be
clamped to an “EMC plate.”
• Motor cabling must be separated from control and signal wiring wherever
possible.
ATTENTION: PowerFlex 520-series drives produce DC current in the
protective earthing conductor which may reduce the ability of RCD’s
(residual current-operated protective devices) or RCM’s (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.