1.6 Precautions for Using Inverters
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1.6.3 Precautions in introducing inverters
This section provides precautions in introducing inverters, e.g. precautions for installation environment,
power supply lines, wiring, and connection to peripheral equipment. Be sure to observe those precautions.
Installation environment
Install the inverter in an environment that satisfies the requirements listed in Table 1.6-1 in Section 1.6.1.
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 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.
Table 1.6-4
Environments Possible problems Sample measures Applications
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 disposal,
sludge treatment, tire
manufacturing, plaster
manufacturing, metal
processing, and a
particular process in
textile factories.
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,
extruding machines,
printing presses,
combustors, and
industrial waste
treatment.
A lot of fibrous or
paper dust
Fibrous or paper dust
accumulated on the heat sink
lowers the cooing effect. Entry of
dust into the inverter may cause
the electronic circuitry to
malfunction.
Any of the following measures may be
necessary.
• Mount the inverter in a sealed panel
that shuts out dust.
• Secure 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 may
cause 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 line,
pumps and food
processing
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 may get damaged.
• Insert shock-absorbing materials
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).
Exporting
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