Mitsubishi Electric FR-E700 Series Instruction Manual page 30

Enclosure design
Cooling system types for inverter enclosure
From the enclosure that contains the inverter, the heat of the inverter and other equipment (trans-
formers, 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.
● Cooling by natural heat dissipation from the enclosure surface (totally enclosed type)
● Cooling by heat sink (aluminium fin, etc.)
● Cooling by ventilation (forced ventilation type, pipe ventilation type)
● Cooling by heat exchanger or cooler (heat pipe, cooler, etc.)
Cooling System
Natural
cooling
Forced
cooling
Tab. 2-2:
2 - 10
Enclosure Structure
Natural ventilation
(Enclosed, open type)
Natural ventilation
(Totally enclosed type)
Heatsink cooling
Forced ventilation
Heat pipe
Cooling system types for inverter enclosure
Comment
Low in cost and generally used, but the enclosure size
increases as the inverter capacity increases. For rela-
tively small capacities.
I001000E
Being a totally enclosed type, the most appropriate for
hostile environment having dust, dirt, oil mist, etc. The
enclosure size increases depending on the inverter
capacity.
I001001E
Having restrictions on the heatsink mounting position
and area, and designed for relative small capacities.
heatsink
I001002E
For general indoor installation. Appropriate for enclo-
sure downsizing and cost reduction, and often used.
I001003E
Totally enclosed type for enclosure downsizing.
heat pipe
I001004E
Installation