VLT
®
2800 Series
All about VLT
2800
CCC: Capacitive clamp coupling ( 5 kHz)
DCN: Direct coupling network (5 kHz)
1. Injection on cable shield.
2. Electromagnetic clamp.
■ Harmonic Current Emission
All 3 phase 380-480 V units comply with EN 61000-3-2.
■ Aggressive environments
As all other electronic equipment, a frequency
converter contains a number of mechanical and
electronic components, which to a varying extent
are vulnerable to environmental impact.
Consequ ently, t he frequency converter is
not to be installed in environments, where
liquids, particles or gases are in the air that
would impact and damage the electronics. Unless
the necessary measures are taken to pr otect the
frequency converter, there is a risk of stoppages, which
reduce the service life of the frequency converter.
Liquids can be carried through the air and condense
in the frequency converter. In addition, liquids may
facilitate galvanic corrosion of components and metal
parts. Steam, oil and brine may cause corrosion of
components and m etal parts. In these areas, it is
recommended to fit units in c abinets. A s a minimum,
cabinets should be enclosure IP 54.
P
articles in the air, such as dust particles, may lead
to mechanical, electrical and thermal faults on the
frequency converter. Typical indicators that there
are too many particles in the air are dust part icles
around the frequency converter fan. In very d usty
areas, cabinet fitting of units is recommended. As a
minimum, cabinets s hould be enclosure IP 54.
A
ggressive gases, such as sulphur, nitrogen and
chlorine compounds, together with high humidity and
temperature, facilitate possible chemical processes on
the components of the frequency converter. These
chemical processes quickly impact and damage
the electronics. I n these areas, cabinet fitt ing with
fresh-air circulat ion in the ca binet is recommended,
thereby ensuring that aggressive gases are kept
away from the frequency converter.
NB!:
Fitting of frequency converters in aggressive
environments increases the risk of stoppages,
in addition to considerably reducing
the service life of the unit.
Before the frequency converter is installed, it m ust
be checked whether there are liquids, particles or
gases in the air. This can be done by looking at
existing installations in the same environment. Typical
indicators of harmful airborne liquids are water or
oil on metal parts or corrosion of metal parts. Too
many dust particles are typically observed on top
of installation cabinets and on existing electrical
installations. Indicators that there are aggressive
gases in the air are copper rails and cable ends that
are blac k on existing electrical installations.
MG.28.E9.02 - VLT is a registered Danfoss trademark
139
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