Mitsubishi Electric FR-A800, Instruction Manual

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Installation of the inverter and enclosure design Installation and wiring
2 - 12
2.3 Installation of the inverter and enclosure design
When designing or manufacturing an inverter enclosure, determine its structure, size, and device lay-
out by fully considering the conditions such as heat generation of the contained devices and the op-
erating environment. 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 sat-
isfies 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
Temperature applicable for a short time, e.g. in transit.
For the installation at an altitude above 1,000 m up to 2,500 m, derate the rated current 3% per
500 m.
2.9 m/s
2
or less for the FR-A840-04320(160K) or higher.
Temperature
The permissible surrounding air temperature of the inverter is between –10 °C and +50 °C (–10 °C and
+40 °C at the SLD rating). Always operate the inverter within this temperature range. Operation out-
side this range will considerably shorten the service lives of the semiconductors, parts, capacitors and
others. Take the following measures to keep the surrounding air temperature of the inverter within
the specified range.
●
Measures against high temperature
– Use a forced ventilation system or similar cooling system. (Refer to page 2-15.)
– Install the enclosure 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 enclosure well.
Item Description
Surrounding air
temperature
LD,
ND (initial setting),
HD
–10 to +50 °C (non-freezing)
SLD –10 to +40 °C (non-freezing)
Ambient humidity
With circuit board coating (conforming to IEC60721-3-3 3C2/3S2),
IP55 compatible models:
95% RH or less (non-condensing)
Without circuit board coating:
90% RH or less (non-condensing)
Storage temperature
–20 to +65 °C
Atmosphere Indoors (free from corrosive gas, flammable gas, oil mist, dust and dirt)
Altitude
Maximum 1,000 m above sea level.
Vibration
5.9 m/s
2
or less at 10 to 55 Hz (directions of X, Y, Z axes)
Tab. 2-4: Environmental standard specifications of inverter
Measurement
position
Measurement
position
Inverter
5 cm
5 cm
5 cm