1.3 Precautions for Using Inverters
1-7
Fuji Electric strongly recommends installing inverters in a panel for safety reasons, in particular, when installing the
ones whose enclosure rating is IP00.
When installing the inverter in a place out of the specified environmental requirements, it is necessary to derate the
inverter or consider the panel engineering design suitable for the special environment or the panel installation
location. For details, refer to the Fuji Electric technical information “Engineering Design of Panels” or consult your
Fuji Electric representative.
The special environments listed below require using the specially designed panel or considering the panel
installation location.
Highly concentrated
sulfidizing gas or other
corrosive gases
Corrosive gases cause parts
inside the inverter to corrode,
resulting in an inverter
malfunction.
Any of the following measures may be
necessary.
- Mount the inverter in a sealed
panel with IP6X or air-purge
mechanism.
- Place the panel in a room free
from influence of the gases.
Paper manufacturing,
sewage treatment, sludge
treatment, tire
manufacturing, plaster
manufacturing, metal
processing, certain
applications in the textile
industry
A lot of conductive dust
or foreign material
(e.g., metal powders or
shavings, carbon fibers,
or carbon dust)
Entry of conductive dust into
the inverter causes a short
circuit.
Any of the following measures may be
necessary.
- Mount the inverter in a sealed
panel.
- Place the panel in a room free
from influence of the conductive
dust.
Wiredrawing machines,
metal processing in
general, extruders, printing
machines, garbage
incinerators, industrial
waste disposal, etc.
A lot of fibrous or paper
dust
Fibrous or paper dust
accumulated on the heat sink
lowers the cooling effect.
Entry of dust into the inverter
causes the electronic circuitry
to malfunction.
Any of the following dust measures
may be necessary.
- Mount the inverter in a sealed
panel that shuts out dust.
- Ensure a maintenance space for
periodical cleaning of the heat sink
in panel engineering design.
- Employ external cooling when
mounting the inverter in a panel for
easy maintenance and perform
periodical maintenance.
Textile manufacturing and
paper manufacturing
High humidity or dew
condensation
In an environment where a
humidifier is used or where
the air conditioner is not
equipped with a dehumidifier,
high humidity or dew
condensation results, which
causes a short-circuiting or
malfunction of electronic
circuitry inside the inverter.
∙ Put a heating module such as a
space heater in the panel.
Outdoor installation,
film manufacturing lines,
pumps, food processing,
etc.
Vibration or shock
exceeding the specified
level
If a large vibration or shock
exceeding the specified level
is applied to the inverter, for
example, due to a carrier
running on seam joints of rails
or blasting at a construction
site, the inverter structure
gets damaged.
∙ Insert shock-absorbing material
between the mounting base of the
inverter and the panel for safe
mounting.
Installation of an inverter
panel on a carrier or self-
propelled machine.
Ventilating fan at a
construction site or a press
machine.
Fumigation for export
packaging
Halogen compounds such as
methyl bromide used in
fumigation corrodes some
parts inside the inverter.
- When exporting an inverter built in
a panel or equipment, pack them
in a previously fumigated wooden
crate.
- When packing an inverter alone for
export, use a laminated veneer
lumber (LVL).
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