Mitsubishi Electric FR-A700 Instruction Manual page 33

Installation
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 dis-
sipated 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: Cooling system types for inverter enclosure
FR-A700 EC
Enclosure Structure
Natural ventilation
(Enclosed, open type)
Natural ventilation
(Totally enclosed
type)
Heatsink cooling
heatsink
Forced ventilation
Heat pipe
Comment
Low in cost and generally used, but the enclosure
size increases as the inverter capacity increases.
For relatively 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 posi-
tion and area, and designed for relative small
capacities.
I001002E
For general indoor installation. Appropriate for
enclosure downsizing and cost reduction, and often
used.
I001003E
Totally enclosed type for enclosure downsizing.
heat pipe
I001004E
Enclosure design
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