Installation
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DDS
HARDWARE
Electrical considerations
Indications regarding EMC
Electromagnetic Compatibility is covered by the following standards:
EMC instructions for equipment installation
MANDATORY.
The electrical installation my comply with standard EN 60204-1.
T. H8/2 Standards regarding Electromagnetic Compatibility.
EN 61800-3:2004
/A1:2011
*
Category C3. Adjustable speed electrical power
drive systems. Part 3: EMC requirements and
specific test methods.
IEC 61800-5-2:2016 Adjustable speed electrical power drive systems -
Part 5-2: Safety requirements - Functional.
* MANDATORY. The EMC directive defines equipment as any device or fixed
installation. This device is identified as a fixed installation and is meant to work
inside an electrical cabinet according to category C3 and meeting the EN
61800-3 standard.
*
MANDATORY. The installation that includes this DDS system may need a
harmonic suppressing filter to comply with the standard EN 61800-3:2004
which is harmonized with the EMC Directive. Otherwise, when applying
solutions to limit the harmonics in each DDS system included in the installation
(except in systems with RPS, that would not require them) could be an
expensive solution and/or would not make any technical sense. It is better to
apply a global solution.
MANDATORY. These Power Drive Systems are not meant to be used in a
low voltage public mains that supplies energy to house installations. Radio
frequency disturbances may be expected when used in this case. However,
equipment whose compliance with the essential requirements set out in item
1. General requirements of annex I of the EMC Directive that are not ensured
in residential areas will include an indication with this use restriction.
MANDATORY.
Use galvanized or chromed plates in the installation.
Make the connections with wide contact surfaces for the metal parts.
Remove the paint from contact surfaces.
Try to increase conductivity on two-dimensional contacts.
Install a protection circuit if there is a risk of over-voltage.
Electrical energy supply lines from the lines carrying the information.
Note. The electrical field which could induce voltage spikes on the information
lines decreases with distance.
Route the motor cable at a distance of at least 20 cm from the signal cable
or use shielding plates between the motor cable and signal cable.
Do not run field bus cables and signal 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.
Recommendation
. Separate the conduits where the cables are running at
least 20 cm and 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.
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