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Mitsubishi Electric FR-B-750 to 75K Instruction Manual Page 20

Fr-b-750 to 75k (200v class), fr-b-750 to 110k (400v class).
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(2) Clearances around the inverter
To ensure ease of heat dissipation and maintenance, leave at least the shown clearances around the inverter. At least the
following clearances are required under the inverter as a wiring space, and above the inverter as a heat dissipation space.
Ambient temperature and humidity
Measurement
position
Inverter
5cm
5cm
Measurement
5cm
position
Temperature:
-10°C to 50°C
Ambient humidity:
90% RH maximum
Leave enough clearances and take
cooling measures.
(3) Inverter mounting orientation
Mount the inverter on a wall as specified. Do not mount it horizontally or any other way.
(4) Above the inverter
Heat is blown up from inside the inverter by the small fan built in the unit. Any equipment placed above the inverter
should be heat resistant.
(5) Arrangement of multiple inverters
When multiple inverters are placed in the same
enclosure, generally arrange them horizontally as
shown in the right figure (a). When it is inevitable to
arrange them vertically to minimize space, take such
measures as to provide guides since heat from the
bottom inverters can increase the temperatures in the
top inverters, causing inverter failures.
When mounting multiple inverters, fully take caution
not to make the ambient temperature of the inverter
higher than the permissible value by providing
ventilation and increasing the enclosure size.
(6) Placement of ventilation fan and inverter
Heat generated in the inverter is blown up from the bottom of
the unit as warm air by the cooling fan. When intalling a
ventilation fan for that heat, determine the place of ventilation
fan installation after fully considering an air flow. (Air passes
through areas of low resistance. Make an airway and airflow
plates to expose the inverter to cool air.)
Clearances
55K or less
10cm or more
5cm
5cm
10cm
or more *
or more *
or more
10cm or more
*1cm or more for 3700 or less
Inverter
(a) Horizontal arrangement
Installation of the inverter and enclosure
(front)
75K or more
20cm or more
10cm
or more
20cm or more
Inverter
Inverter
Guide
Inverter
Enclosure
Enclosure
(b) Vertical arrangement
Arrangement of multiple inverters
Inverter
<Good example>
Placement of ventilation fan and inverter
design
Clearances (side)
Inverter
5cm
or more
Inverter
Guide
Guide
Inverter
Inverter
<Bad example>
11
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