General Requirements For Emc; Ground (Earth) Connections; General Emc Enclosure Layout Showing Earth / Ground Connections - Emerson SP1201 Installation Manual

Safety Product
Introduction
Information information
6.5.2

General requirements for EMC

Ground (earth) connections

The grounding arrangements should be in accordance with Figure 6-14,
which shows both drives mounted on a back-plate with or without an
additional enclosure.
Figure 6-14 shows how to manage EMC when using a shielded motor
cable, and indicates the clearances which should be observed around
the drive and related 'noisy' power cables by all sensitive control signals
/ equipment.
Figure 6-14 General EMC enclosure layout showing earth / ground connections
Do not place sensitive
(unscreened) signal circuits
in a zone extending
300mm (12") all around the
drive, motor cable, input
cable from EMC filter
The voltage present in the
wiring between the Regen
drive and regen inductor
is a source of radio
emission. These cables
should be kept as short as
possible. (I.e. The regen
inductor mounted as
close as possible to the
Regen drive.)
Metal backplate
safety bonded to
power ground busbar
EMC filter
The incoming supply ground,
PE, should be connected to a
single power ground bus bar
or low impedance ground
terminal inside the cubicle.
This should be used as a
common 'clean' ground for all
components inside the cubicle.
Unidrive SP Regen Installation Guide
Issue Number: 2
System Mechanical
design installation
Grounding
bar
components
Screen and ground connections
should be followed as shown in
Electrical Installation
300mm
(12in)
www.controltechniques.com
Electrical Getting
Optimisation
installation started
±DC bus connections
Regen
Signal
cables
External
controller
0V PE
.
If the control circuit 0V
is to be grounded, this
should be done at the
system controller only to
avoid injecting noise
currents into the 0V circuit
Technical Component
Parameters
data sizing
The DC connection between the
Regen and motoring drive carries
common mode high frequency
voltage comparable with the
output voltage from a standard
drive.
Screened cable should be used
with the screen connection
connected to a single power
ground busbar or low impedance
ground terminal inside the cubicle.
Use four core cable to
connect the motor to the drive.
The ground conductor in the
motor cable must be connected
directly to the ground terminal of
the drive and motor.
It must not be connected directly
to the power ground busbar.
Diagnostics
79