Inverter installation environment. Mitsubishi Electric FR-F806-E-L2 (IP55/UL Type 12
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Installation of the inverter
2.3
Installation of the inverter
An inverter unit uses many semiconductor devices. To ensure higher reliability and long period of operation, operate the inverter in the ambient environment that completely satisfies the equipment specifications.
2.3.1
Inverter installation environment
The following table lists the standard specifications of the inverter installation environment. Using the inverter in an environment that does not satisfy the conditions deteriorates the performance, shortens the life, and causes a failure. Refer to the following points, and take adequate measures.
Standard environmental specifications of the inverter
Item Description
Inverter
Measurement position
5 cm Ambient temperature -10 to +40°C (non-freezing) 5 cm
Measurement position
Ambient humidity
Storage temperature
Atmosphere
Altitude
Vibration
95% RH or less (non-condensing)
-20 to +65°C
Indoors (free from corrosive gas, flammable gas, oil mist, dust and dirt)
5.9 m/s
or less at 10 to 55 Hz (directions of X, Y, Z axes)
Temperature applicable for a short time, e.g. in transit.
For the installation at an altitude above 1,000 m, derate the rated current 3% per 500 m.
2.9 m/s 2 or less for the FR-F846-01160(55K) or higher.
5 cm
Temperature
The permissible ambient temperature of the inverter is between -10°C and +40°C. Always operate the inverter within this temperature range. Operation outside this range will considerably shorten the service lives of the semiconductors, parts, capacitors and others. Take the following measures to keep the ambient temperature of the inverter within the specified range.
(a) Measures against high temperature
• Ventilate the room.
• Install the inverter in an air-conditioned electric chamber.
• Block direct sunlight.
• Provide a shield or similar plate to avoid direct exposure to the radiated heat and wind of a heat source.
• Ventilate the area around the inverter well.
(b) Measures against low temperature
• Provide a heater around the inverter.
• Do not power OFF the inverter. (Keep the start signal of the inverter OFF.)
(c) Sudden temperature changes
• Select an installation place where temperature does not change suddenly.
• Avoid installing the inverter near the air outlet of an air conditioner.
• If temperature changes are caused by opening/closing of a door, install the inverter away from the door.
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Installation of the inverter
Humidity
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.
Countermeasure
• 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 2500 m. For the installation at an altitude above 1,000 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 inverter is up to 5.9 m/s
2
(2.9 m/s
2
or less for the FR-F846-01800(75K) or higher) 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
• Strengthen the structure to prevent the installation surface from resonance.
• Install the inverter away from the sources of the vibration.
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