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9. CHARACTERISTICS
(2) Heat dissipation area for enclosed servo amplifier
An enclosure or control box for the servo amplifier should be designed to operate at the ambient
temperature of 40 (104 ) within a temperature rise of 10
the system should operate within a maximum 55
dissipation area can be calculated by Equation 9-1:
A
K
where, A:
Heat dissipation area [m
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 9-1 lists the enclosure dissipation area for each servo amplifier when the servo amplifier is
operated at the ambient temperature of 40
P
T
]
2
(50 ). (With a 5
(131 ) limit.) The necessary enclosure heat
(9-1)
(Outside)
Fig. 9-1 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.
(104 ) under rated load.
9 - 4
(41 ) safety margin,
(Inside)
Air flow
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