QCQR-16/28
Q
uer
C
us - Power Drive System.
Q
uick
R
eference. Ref.2101
EMC instructions for equipment installation
Use equipotential wires in systems with:
* note)
MANDATORY.
The installation that includes this product may need a
harmonic suppressing filter to comply with the standard
IEC 61800-3 which is harmonized with the EMC
Directive. Otherwise, when applying solutions to limit the
harmonics for each QC-PDS system included in the
installation, this could be an expensive solution and/or it
might not make any technical sense. It is better to apply a
global solution
* note)
MANDATORY.
This type of Power Drive System is not designed to be
used with a domestic low-voltage power supply mains.
Radio frequency disturbances may be expected when
used in this case. However, equipment whose
compliance with the essential requirements set out
under the heading 1. GENERAL REQUIREMENTS of ANNEX I
of the EMC Directive that are not ensured in residential
areas will include an indication with this restriction on
use.
MANDATORY.
Use the copper and aluminum plates that are
provided as accessories during mounting.
Make the connections with wide contact surfaces for
the metal parts.
Remove any paint from the contact surfaces.
Try to increase conductivity on two-dimensional
contacts.
Install a protection circuit if there is a risk of over-
voltage.
Move power lines away from signal lines. Remember
that electric fields can induce voltage peaks in signal
lines, which decreases when there is more distance
between them.
Move the motor cable at least 20 cm away from the
signal cable or use shielding plates between the
motor cable and signal cable.
Do not install field bus or signal cables through a
single conduit with DC and AC lines with voltages
over 60 V. The field bus cables, signal lines and
analog lines can be installed in a same conduit.
It is recommended to separate the cable installation
conduits by at least 20 cm, or make them as short as
possible. Do not install unnecessary cable loops and
use short cables from the central ground point for
connecting to a ground point outside the electrical
cabinet.
Avoid induction loops by choosing common routes
for power, signal and data circuit cables.
Use shielded cables for the power supply and motor.
For shielded cables, the unshielded portion of the
cable used to connect them to the connectors must
be as short as possible in order to reduce radiated
emissions.
MANDATORY.
Installations in large areas.
Different voltage sources.
Mains through several buildings reducing the current
in the cable shield and the emissions. Connect to
ground the electrical cabinet, the door, the mounting
plate, with ground straps or cables with a cross
section larger than 10 mm² (AWG 6).
The digital signal wire shielding must be connected
at both ends to a large surface or through a
conductive housing of the connector. This reduces
disturbances that affect the signal cables and also
the emissions.
The analog signal wire shielding must be connected
directly to the device (signal input), reducing the
ground loops due to low frequency disturbances.
Make shield connection on the grounded side of the
equipment when a device does not have a ground
connection.
Do not use the conduits as grounding conductors;
use the ground protection conductor inside the
conduits.
Use cable and ground clamps to connect large areas
of cable shield.
Install a single uncut shielded cable. If a cable must
necessary be cut for the installation, connect it with
the shield connections and through a metal cover at
the cut (joint) point. In the worst case, if it is not
possible to use shielded connectors, keep the
shortest length possible of cable exposed to
interferences, so as to ensure a sound connection
between the shields.
Install switching devices such as contactors, relays
or electro-valves with interference suppression
elements or arc suppressors (e.g. diodes, varistors,
RC circuits).
Install power and control components separately.
Use equipotential cables when having long lines to
reduce the current through the cable shield.
When connecting power cables, the shield of this
cable should be connected to a ground bar.
MANDATORY.
Run a single shielded cable, in one piece, without
joints. If a cable must necessary be cut for the
installation, connect it with the shield connections
and through a metal cover at the cut (joint) point. In
the worst case, if it is not possible to use shielded
connectors, keep a minimum length of cable
exposed to disturbances guaranteeing a good
connection between the shields. See figure ·A·.
When connecting the single-pole power cables to
the motor, the shield for this cable should be
connected to a chassis support. See figure ·B·.
When connecting power cables to the motor
feedback and direct feedback, the shield for these
cables should be connected to a ground bar
(Grounding Plate-2). See figure ·C·.