Installation of the inverter and enclosure
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.
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.)
(Enclosed, open type)
Natural ventilation (Totally
(1) Installation of the Inverter
Installation on the enclosure
Fix six positions for the FR-A740-03250 to
06830 and fix eight positions for the FR-A740-
07700 to 09620.
Low in cost and generally used, but the enclosure size
increases as the inverter 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 inverter
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.
When encasing multiple inverters, install them in parallel
as a cooling measure. Install the inverter vertically.
* Refer to the clearances on the next page.