Mitsubishi Electric FR-CC2-P, Инструкция по эксплуатации

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Installation of the converter unit and enclosure design
INSTALLATION AND WIRING
21
2
(a) Measures against high humidity
• Make the enclosure enclosed, and provide it with a hygroscopic agent.
• Provide dry air into the enclosure from outside.
• Provide a space heater in the enclosure.
(b) Measures against low humidity
Air with proper humidity can be blown into the enclosure from outside. Also when installing or inspecting the unit, discharge
your body (static electricity) beforehand, and keep your body away from the parts and patterns.
(c) Measures against condensation
Condensation may occur if frequent operation stops change the in-enclosure temperature suddenly or if the outside air
temperature changes suddenly.
Condensation causes such faults as reduced insulation and corrosion.
• Take the measures against high humidity in (a).
• Do not power OFF the converter unit.
 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.
Countermeasure
• Place the inverter in a totally enclosed enclosure.
Take measures if the in-enclosure temperature rises. (Refer to page 22 .)
• 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 converter unit 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 above-mentioned measures.
 Explosive, flammable gases
As the converter unit 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 converter unit at an altitude of within 1000 m. For use at an altitude above 1000 m (up to 2500 m), derate the rated
current 3% per 500 m.
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 converter unit is up to 2.9 m/s
2
at 10 to 55 Hz frequency and 1 mm amplitude for the directions
of 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.
Especially when impacts are applied repeatedly, caution must be taken because such impacts may break the installation feet.
Countermeasure
• Provide the enclosure with rubber vibration isolators.
• Strengthen the structure to prevent the enclosure from resonance.
• Install the enclosure away from the sources of the vibration.