Danfoss VLT 2800 Series, Operating Instructions Manual

Page: 83 / 103

Special conditions
Aggressive environments
As all other electronic equipment, a frequency con-
verter contains a number of mechanical and electronic
components, which to a varying extent are vulnerable
to environmental impact.
Consequently, the frequency converter is
not to be installed in environments, where
liquids, particles or gases are in the air
that would impact and damage the elec-
tronics. Unless the necessary measures
are taken to protect the frequency con-
verter, 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 fa-
cilitate galvanic corrosion of components and metal
parts. Steam, oil and brine may cause corrosion of
components and metal parts. In these areas, it is rec-
ommended to fit units in cabinets. As a minimum,
cabinets should be enclosure IP 54.
Particles in the air, such as dust particles, may lead to
mechanical, electrical and thermal faults on the fre-
quency converter. Typical indicators that there are too
many particles in the air are dust particles around the
frequency converter fan. In very dusty areas, cabinet
fitting of units is recommended. As a minimum, cabi-
nets should be enclosure IP 54.
Aggressive 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. In these areas, cabinet fitting with fresh-air
circulation in the cabinet is recommended, thereby en-
suring that aggressive gases are kept away from the
frequency converter.
NB!
Fitting of frequency converters in aggres-
sive environments increases the risk of
stoppages, in addition to considerably re-
ducing the service life of the unit.
Before the frequency converter is installed, it must be
checked whether there are liquids, particles or gases
in the air. This can be done by looking at existing in-
stallations 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 par-
ticles are typically observed on top of installation cab-
inets and on existing electrical installations. Indicators
that there are aggressive gases in the air are copper
rails and cable ends that are black on existing electrical
installations.
Derating for ambient temperature
The ambient temperature (T
AMB,MAX
) is the maximum
temperature allowed. The average (T
AMB,AVG
) meas-
ured over 24 hours, must be at least 5 °C lower. If the
frequency converter operates at temperatures above
45 °C, a derating of the rated output current is neces-
sary.
VLT
®
2800 Series
82 MG.27.A2.02 - VLT
®
is a registered Danfoss trademark