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Operate the inverter within the ambient air humidity of usually 45 to 90%. Too high humidity will pose problems of reduced
insulation and metal corrosion. On the other hand, too low humidity may cause a spatial electrical breakdown.
The insulation distance defined in JEM1103 "Control Equipment Insulator" is humidity of 45 to 85%.
(a) Measures against high humidity
• Provide dry air into the room from outside.
• Use a dehumidifier.
(b) Measures against low humidity
Air with proper humidity can be blown into the room 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-room 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 inverter. (Keep the start signal of the inverter OFF.)
Dust, dirt, oil mist
Dust and dirt will cause faults such as poor contacts, reduction in insulation and cooling effect due to accumulation of
moisture-absorbed dust and dirt, and equipment internal temperature rise due to a clogged ventilation filter in the room where
the equipment is installed. 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.
• 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 a place, take the countermeasures described in "Dust, dirt, oil mist" above.
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 the installation at an altitude above 1,000 m (3280.80 feet) up to 2,500 m
(8202 feet), derate the rated current 3% per 500 m (1640.40 feet).
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
Vibration, impact
The vibration resistance of the inverter is up to 5.9 m/s
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.
• Strengthen the structure to prevent the installation surface from resonance.
• Install the inverter away from the sources of the vibration.
(2.9 m/s
or less for the FR-A846-01800(55K) or higher) at 10 to 55
Installation of the inverter


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