filtering are followed. On this basis, a declaration of
conformity in accordance with the EMC directive is issued.
The Design Guide offers detailed instructions for instal-
lation to ensure EMC-correct installation. Furthermore,
Danfoss specifies which our different products comply
with.
Danfoss provides other types of assistance that can help
you obtain the best EMC result.
2.2.4 Compliance with EMC Directive
89/336/EEC
As mentioned, the frequency converter is mostly used by
professionals of the trade as a complex component
forming part of a larger appliance, system, or installation. It
must be noted that the responsibility for the final EMC
properties of the appliance, system or installation rests
with the installer. As an aid to the installer, Danfoss has
prepared EMC installation guidelines for the Power Drive
system. The standards and test levels stated for Power
Drive systems are complied with, provided that the EMC-
correct instructions for installation are followed, see the
section
EMC Immunity
.
The frequency converter has been designed to meet the
IEC/EN 60068-2-3 standard, EN 50178 pkt. 9.4.2.2 at 50
°
C.
2.3 Aggressive Environments
A frequency converter contains a large number of
mechanical and electronic components. All are to some
extent vulnerable to environmental effects.
CAUTION
The frequency converter should not be installed in
environments with airborne liquids, particles, or gases
capable of affecting and damaging the electronic
components. Failure to take the necessary protective
measures increases the risk of stoppages, thus reducing
the life of the frequency converter.
Liquids can be carried through the air and condense in the
frequency converter and may cause corrosion of
components and metal parts. Steam, oil, and salt water
may cause corrosion of components and metal parts. In
such environments, use equipment with enclosure rating
IP54. As an extra protection, coated printed circuit boards
can be ordered as an option.(Standard on some power
sizes.)
Airborne Particles such as dust may cause mechanical,
electrical, or thermal failure in the frequency converter. A
typical indicator of excessive levels of airborne particles is
dust particles around the frequency converter fan. In very
dusty environments, use equipment with enclosure rating
IP54 or a cabinet for IP20/TYPE 1 equipment.
In environments with high temperatures and humidity,
corrosive gases such as sulphur, nitrogen, and chlorine
compounds will cause chemical processes on the
frequency converter components.
Such chemical reactions will rapidly affect and damage the
electronic components. In such environments, mount the
equipment in a cabinet with fresh air ventilation, keeping
aggressive gases away from the frequency converter.
An extra protection in such areas is a coating of the
printed circuit boards, which can be ordered as an option.
NOTE
Mounting frequency converters in aggressive environments
increases the risk of stoppages and considerably reduces
the life of the frequency converter.
Before installing the frequency converter, check the
ambient air for liquids, particles, and gases. This is done by
observing existing installations in this environment. Typical
indicators of harmful airborne liquids are water or oil on
metal parts, or corrosion of metal parts.
Excessive dust particle levels are often found on instal-
lation cabinets and existing electrical installations. One
indicator of aggressive airborne gases is blackening of
copper rails and cable ends on existing installations.
2.4 Vibration and Shock
The frequency converter has been tested according to the
procedure based on the shown standards:
The frequency converter complies with requirements that
exist for units mounted on the walls and floors of
production premises, as well as in panels bolted to walls or
floors.
IEC/EN 60068-2-6:
Vibration (sinusoidal) - 1970
IEC/EN 60068-2-64:
Vibration, broad-band random
Safety and Conformity
VLT Micro Drive Design Guide
12
MG02K102 - VLT
®
is a registered Danfoss trademark
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