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Aggressive environments
In common with all electronic equipment, an adjusta-
ble frequency drive contains a large number of me-
chanical and electronic components, all of which are
vulnerable to environmental effects to some extent.
The adjustable frequency drive should not
therefore 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 adjustable frequency drive.
Liquids can be carried through the air and condense
in the adjustable frequency drive. 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 recommen-
ded. As an extra protection, coated printet circuit
boads can be orded as an option.
Airborne Particles such as dust particles may cause
mechanical, electrical or thermal failure in the adjust-
able frequency drive. A typical indicator of excessive
levels of airborne particles is dust particles around the
adjustable frequency drive fan. In very dusty environ-
ments, equipment with enclosure rating IP 54 or a
cabinet for IP 00/IP 20/Nema 1 equipment is recom-
mended.
In environments with high temperatures and humidi-
ty, 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 dam-
age 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.
An extra protection in such areas a conformal coating
of the printed ircuit boards can be ordered as an option.
NOTE
Mounting adjustable frequency drives in
aggressive environments will increase the
risk of stoppages and furthermore consid-
erably reduce the life of the drive.
Before the installation of the adjustable frequency
drive, the ambient air should be checked for liquids,
particles and gases. This may be done by observing
existing installations in this environment. Typical indi-
cators of harmful airborne liquids are water or oil on
metal parts, or corrosion of metal parts.
Excessive dust particle levels are often found on in-
stallation cabinets and existing electrical installations.
One indicator of aggressive airborne gases is black-
ening of copper rails and cable ends on existing in-
stallations.
See also Instruction MN.90.IX.YY
VLT
®
5000 Series
216
MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.
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Страница 196: ...RELATIVE VLT 5000 Series MG 51 C5 22 VLT p is a registered Danfoss trademark 193 List of functions ...
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