Mitsubishi Electric FR-A862-E Instruction Manual page 21

Installation of the inverter and enclosure design
2.3.3
Cooling system types for inverter enclosure
From the enclosure that contains the inverter, the heat of the inverter and other equipment (transformers, lamps, resistors,
etc.) and the incoming heat such as direct sunlight must be dissipated to keep the in-enclosure temperature lower than the
permissible temperatures of the in-enclosure equipment including the inverter.
The cooling systems are classified as follows in terms of the cooling calculation method.
(a) Cooling by natural heat dissipation from the enclosure surface (totally enclosed type)
(b) Cooling by heat sink (aluminum fin, etc.)
(c) Cooling by ventilation (forced ventilation type, pipe ventilation type)
(d) Cooling by heat exchanger or cooler (heat pipe, cooler, etc.)
Cooling system
Natural ventilation
(enclosed type / open type)
Natural
Natural ventilation (totally
enclosed type)
Heat sink cooling
Forced ventilation
Forced air
Heat pipe
20
INSTALLATION AND WIRING
Enclosure structure
INV
INV
Heat sink
INV
INV
Heat
pipe
INV
Comment
This system is low in cost and generally used, but the
enclosure size increases as the inverter capacity increases.
This system is for relatively small capacities.
Being a totally enclosed type, this system is the most
appropriate for hostile environment having dust, dirt, oil mist,
etc. The enclosure size increases depending on the inverter
capacity.
This system has restrictions on the heat sink mounting
position and area. This system is for relatively small
capacities.
This system is for general indoor installation. This is
appropriate for enclosure downsizing and cost reduction, and
often used.
This is a totally enclosed for enclosure downsizing.