FCM 300 Series
91
MG.03.B6.02 - VLT is a registered Danfoss trademark
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Aggressive environments
In common with all electronic equipment, a VLT
frequency converter contains a large number of
mechanical and electronic components, all of which
are vulnerable to environmental effects to some
extent.
The VLT frequency converter should
not therefore be installed in environ-
ments with airborne liquids, particles or
gases capable of affecting and damaging the elec-
tronic components. Failure to take the necessary
protective measures increases the risk of stop-
pages, thus reducing the life of the VLT frequency
converter.
Liquids can be carried through the air and condense
in the VLT frequency converter. In addition to this,
liquids may cause corrosion of components and
metal parts.
Steam, oil and salt water may cause corrosion of
components and metal parts.
In such environments, equipment with enclosure
rating
≥
IP 54 is recommended.
In environments with high temperatures and
humidity, corrosive gases such as sulphur, nitrogen
and chlorine compounds will cause chemical
processes on the VLT frequency converter
components. Such chemical reactions will rapidly
affect and damage the electronic components.
NOTE!
Mounting VLT frequency converters in
aggressive environments will increase the
risk of stoppages and furthermore considerably
reduce the life of the converter.
Before the installation of the VLT frequency converter,
the ambient air should be checked for liquids,
particles and gases. This may be 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
installation cabinets and existing electrical
installations.
One indicator of aggressive airborne gases is
blackening of copper rails and cable ends on existing
installations.
Aggr
essive envir
onments
