Mitsubishi Electric FATEC FR-A800 Manual page 139

7
REVIEW OF INSTALLATION ENVIRONMENT
● Dust, dirt, oil mist
Dust and dirt will cause such faults as poor contacts, reduced insulation and cooling effect due to
the moisture-absorbed accumulated dust and dirt, and in-enclosure temperature rise due to a
clogged filter.
In an atmosphere where conductive powder floats, dust and dirt will cause such faults as
malfunction, deteriorated insulation and short circuit in a short time.
Since oil mist will cause similar conditions, it is necessary to take adequate measures.
Countermeasures
(a) Place the inverter in a totally enclosed enclosure.
Take countermeasures if the in-enclosure temperature rises.
(b) Purge air.
Pump clean air from outside to make the in-enclosure air pressure higher than the outside air
pressure.
● Corrosive gas, salt damage
If the inverter is exposed to corrosive gas or to salt near a beach, the printed board patterns and
parts will corrode or the relays and switches will result in poor contact.
In such places, take the measures given in (a) and (b) of the previous paragraph.
● 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.
● High altitude
Use the inverter at an altitude of within 1000 m. For use at an altitude above 1000 m (up to 2500
m), consider a 3% reduction in the rated current per 500 m increase in altitude.
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.
● Vibration, impact
The vibration resistance of the inverter is up to 5.9 m/s
X, Y, Z axes).
Applying vibration and impacts for a long time may loosen the structures and cause poor
contacts of connectors, even if those vibration and impacts are within the specified values. 2.9
m/ s depending on the capacity.
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Especially, repeated impacts require attention because accidents including installation feet
damage are likely to occur.
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 the sources of the vibration.
7.4 Precautions for storing an inverter in the enclosure
134
 at 10 to 55 Hz frequency (directions of
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