4
Fuji Electric strongly recommends installing dynamic breaking units in a cabinet for safety reasons.
When installing the dynamic breaking unit in a place out of the specified environmental requirements, it is necessary to
derate the dynamic breaking unit or consider the cabinet engineering design suitable for the special environment or the
cabinet 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 cabinet or considering the cabinet installation
location.
Environments Possible
problems
Sample measures
Applications
Highly concentrated
sulfidizing gas or
other corrosive gases
Corrosive gases cause parts
inside the dynamic breaking
unit to corrode, resulting in
an inverter malfunction.
Any of the following measures may
be necessary.
- Mount the dynamic breaking unit
in a sealed cabinet with IP6X or
air-purge mechanism.
- Place the cabinet in a room free
from influence of the gases.
Paper manufacturing,
sewage disposal, sludge
treatment, tire
manufacturing, gypsum
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 dynamic breaking unit
causes a short circuit.
Any of the following measures may
be necessary.
- Mount the dynamic breaking unit
in a sealed cabinet.
- Place the cabinet 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
dynamic breaking unit causes
the electronic circuitry to
malfunction.
Any of the following measures may
be necessary.
- Mount the dynamic breaking unit
in a sealed cabinet that shuts out
dust.
- Ensure a maintenance space for
periodical cleaning of the heat sink
in cabinet engineering design.
- Employ external cooling when
mounting the dynamic breaking
unit in a cabinet 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 dynamic
breaking unit.
- Put a heating module such as a
space heater in the cabinet.
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 dynamic
breaking unit, for example,
due to a carrier running on
seam joints of rails or
blasting at a construction site,
the inverter structure gets
damaged.
- Put shock-absorbing materials on
the mounting base of the dynamic
breaking unit for safe mounting.
Installation of an dynamic
breaking unit cabinet 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 dynamic
breaking unit.
- When exporting a dynamic
breaking unit built in a cabinet or
equipment, pack them in a
previously fumigated wooden
crate.
- When packing a dynamic breaking
unit alone for export, use a
laminated veneer lumber (LVL).
Exporting.
Summary of Contents for BUC S-69D
Page 8: ......
