Rockwell Automation Publication 750-IN119A-EN-P - April 2022 27
Chapter 3 Prepare for Installation
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 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. 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 1…7: At the drive end of the motor cable, the cable shield
must be terminated in one of the following ways.
- For IP00/IP20 and NEMA/UL Open Type drives, the cable shield must
be clamped to a properly installed ‘EMC plate’ for the drive. For Frames
1…5, the EMC plate ships with the drive. For Frames 6…7, use kit
catalog number 20-750-EMC6-Fn (where n is the frame size of the
drive). See PowerFlex 750-Series EMC Plate and Core(s) – Frames 1…7,
publication 750-IN124
, for details. Alternatively, for Frames 6…7, the
cable shield must either terminate in a shielded connector installed in
the enclosure or be clamped to the enclosure containing the drive.
- For IP21 and NEMA/UL Type 1 drives, 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
catalog number 20-750-NEMA1-Fn (where n is the frame size of the
drive). See PowerFlex 750-Series NEMA/UL Type 1 Kits – Frames 1…7,
publication 750-IN008
, for details.
- For IP54 or NEMA/UL Type 12 drives, the cable shield must terminate
in a shielded connector that is installed in the conduit box provided
with the drive (Frames 2…5) or in the enclosure that is provided with
the drive (Frames 6…7).
• 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.
• 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 2
for compliance with radio-frequency emission
limits for the specific standard and installation environment. See Wiring
and Grounding for Pulse Width Modulated (PWM) AC Drives,
publication DRIVES-IN001
for detailed cable length recommendations.
• 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 77
).
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