Cooling System Types For Drive Unit Enclosure - Mitsubishi Electric FR-D720-0.2K-G Instruction Manual

Installation of the drive unit and enclosure design
1.4.2

Cooling system types for drive unit enclosure

From the enclosure that contains the drive unit, the heat of the drive unit 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 drive unit.
The cooling systems are classified as follows in terms of the cooling calculation method.
1) Cooling by natural heat dissipation from the enclosure surface (totally enclosed type)
2) Cooling by heat sink (aluminum fin, etc.)
3) Cooling by ventilation (forced ventilation type, pipe ventilation type)
4) Cooling by heat exchanger or cooler (heat pipe, cooler, etc.)
Cooling System
Natural ventilation
(enclosed, open type)
Natural
cooling
Natural ventilation
(totally enclosed type)
Heatsink cooling
Forced Forced ventilation
cooling
Heat pipe
10
Enclosure Structure
Drive
unit
Drive
unit
Heatsink
Drive
unit
Drive
unit
Heat pipe
Drive
unit
Comment
Low in cost and generally used, but the enclosure size
increases as the drive unit capacity increases. For relatively
small capacities.
Being a totally enclosed type, the most appropriate for hostile
environment having dust, dirt, oil mist, etc. The enclosure size
increases depending on the drive unit capacity.
Having restrictions on the heatsink mounting position and
area, and designed for relative small capacities.
For general indoor installation. Appropriate for enclosure
downsizing and cost reduction, and often used.
Totally enclosed type for enclosure downsizing.