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(2)
Temperature rise in the cabinet should be 10°C or less (or 15°C (max.)
or less when the environment is very favorable in terms of temperature),
compared with the ambient temperature. For the heat design, see Section 3.5.
(3) When the cabinet is designed to be totally enclosed, equip a fan motor to
circulate the air. Air of 0.3 m/sec or over should be blown to the surface of
each unit and printed board. However, the fan air should not be blown directly
to the printed board.
surface, which may result in malfunction of the system. The air reflecting a
plate, etc., should flow in the cabinet.
Right
Air is sucked and
circulated
convection.
(4) To facilitate radiation and smooth air flow, each unit should be separated from
the cabinet by 100 mm or over vertically and 30 mm or over horizontally.
(See Section 3.4.)
Otherwise, contaminant is left on the printed board
Right
Air is hit against the metal
by
sheet and circulated by
convection.
Fig. 3.3.3
– 26 –
Wrong
Air is directly blown to the
printed boards.
STE 73843
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