9 - 3
9. CHARACTERISTICS
(2) Heat dissipation area of enclosed control box
When setting the temperature inside the enclosed control box (hereafter referred to as the control box)
which will contain the converter unit and servo amplifier, factor in the allowance of about 5 (41 )
relative to the maximum operating environmental condition temperature of 55 (131 ) so that it is a
maximum of 10 (50 ) higher than the ambient temperature of 40 (104 ). Use Expression (9.1) to
calculate the heat dissipation area of the control box.
P
A
K
T
......................................................................................................................................................(9.1)
where,
A
: Heat dissipation area [m
2
]
P
: Loss generated in the control box [W]
T
: Difference between internal and ambient temperatures [ ]
K
: Heat dissipation coefficient [5 to 6]
When calculating the heat dissipation area with Equation 9.1, assume that P is the sum of all losses
generated in the enclosure. Refer to Table 9.1 for heat generated by the servo amplifier. "A"
indicates the effective area for heat dissipation, but if the enclosure is directly installed on an
insulated wall, that extra amount must be added to the enclosure's surface area.
The required heat dissipation area will vary wit the conditions in the enclosure. If convection in the
enclosure is poor and heat builds up, effective heat dissipation will not be possible. Therefore,
arrangement of the equipment in the enclosure and the use of a fan should be considered.
Table 8.1 lists the enclosure dissipation area for each servo amplifier when the servo amplifier is
operated at the ambient temperature of 40 (104 ) under rated load.
(Outside)
(Inside)
Air flow
Fig 9.2 Temperature Distribution in Enclosure
When air flows along the outer wall of the enclosure, effective heat exchange will be possible,
because the temperature slope inside and outside the enclosure will be steeper.
(3) Fitting of the servo amplifier
When mounted with the heat sink outside mounting attachment (option), the servo amplifier can
dissipate generated loss directly to the outside of a control box. This method can reduce the heat
dissipation area of the control box since 45 to 55% of the generated loss given in Table 9.1 is dissipated
to the outside of the enclosure. For details of the heat sink outside mounting attachment, refer to
Section 10.3.2.
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