10. CHARACTERISTICS
10 - 4
When calculating the heat dissipation area with equation 10.1, assume that P is the sum of all losses
generated in the cabinet. Refer to table 10.1 for heat generated by the driver. "A" indicates the
effective area for heat dissipation, but if the cabinet is directly installed on an insulated wall, that
extra amount must be added to the cabinet's surface area. The required heat dissipation area will
vary with the conditions in the cabinet. If convection in the cabinet is poor and heat builds up,
effective heat dissipation will not be possible. Therefore, arrangement of the equipment in the
cabinet and the use of a cooling fan should be considered. Table 10.1 lists the cabinet dissipation
area for each driver (guideline) when the driver is operated at the ambient temperature of 40 °C
under rated load.
Fig. 10.2 Temperature distribution in an enclosed type cabinet
When air flows along the outer wall of the cabinet, effective heat exchange will be possible, because
the temperature slope inside and outside the cabinet will be steeper.
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