Special Conditions; Aggressive Environments - Danfoss VLT 8000 AQUA series Operating Instructions Manual

Special conditions

Aggressive environments

In common with all electronic equipment, a frequency
converter contains a large number of mechanical and
electronic components, all of which are vulnerable
to environmental effects to some extent.
The frequency converter should not
therefore be installed in environments
with airborn liquids, particles or gasses
capable of affecting and damaging the elec-tronic
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. 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
IP54/NEMA 12 is recommended.
Airborne particles such as dust particles 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,
equipment with enclosure rating IP54/NEMA 12
or a cabinet for IP00/Chassis and IP20/NEMA
1 equipment is recommended.
MG.83.A2.02 - VLT is a registered Danfoss trademark
®
VLT 8000 AQUA
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, it is recommended that
equipment is mounted in a cabinet with fresh
air ventilation, keeping aggressive gases away
from the frequency converter.
NB!:
Mounting frequency converter in aggressive
environments will increase the risk of
stoppages and furthermore considerably
reduce the life of the drive.
Before the installation of the frequency converter, the
ambient air should be checked for liquids, particles
and gasses. 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
installa-tion cabinets and existing electrical installations.
One indicator of aggressive airborn gasses is blackening
of copper rails and cable ends on existing installations.
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