Mitsubishi Electric FR-A700 Technical Manual page 510

(b) Purge air.
Pump clean air from outside to make the in-
panel pressure higher than the outside-air
pressure.
(4) Corrosive gas, sea breeze
When the enclosure is installed in places exposed to
corrosive gas or sea breeze, the printed circuit board
patterns and parts will be corroded and/or contact
faults of the relays and switches will occur.
In such places, take the measures given in (a) and
(b) in paragraph (3).
(5) Explosive, flammable gases
As the inverter is non-explosion proof, it must be
contained in an explosion proof enclosure. In places
where explosion may be caused by explosive gas,
dust or dirt, an enclosure cannot be used unless it
structurally complies with the guidelines and has
passed the specified tests. This makes the enclosure
itself expensive (including the test charges). The best
way is to avoid installation in such places and install
the inverter in a non-hazardous place. (refer to page
498)
(6) Highland
Use the inverter at the altitude of within 1000m. If it is
used at a higher place, it is likely that thin air will
reduce the cooling effect and low air pressure will
deteriorate dielectric strength.
(7) Vibration, impact
The vibration resistance of the inverter is up to 5.9m/
2
s at 10 to 55Hz frequency. Vibration or impact, if less
than the specified value, applied for a long time may
make the mechanism loose or cause poor contact to
the connectors.
Especially when impact is imposed repeatedly,
caution must be taken as the part mounting pins are
likely to break.
Countermeasures
(a) Provide the enclosure with rubber vibration
isolators.
(b) Strengthen the structure to prevent the
enclosure from resonance.
(c) Install the enclosure away from sources of
vibration.
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