When Using The Servo Amplifier With The Dc Power Supply Input - Mitsubishi Electric MR-J5 Series User Manual

Heat dissipation area for enclosed type cabinet
The enclosed type cabinet (hereafter called the cabinet) that will stores the servo amplifier should be designed to ensure that
its internal temperature rise is within +15 °C at an ambient temperature of 40 °C. Calculate the necessary cabinet dissipation
area with equation (10.1), allowing a margin of approximately 5 °C for the ambient temperature of 60 °C maximum.
P
A = ∙ ∙ ∙ (10.1)
K • ΔT
A: Heat dissipation area [m
P: Loss generated in the cabinet [W]
T: Difference between internal and ambient temperatures [°C]
K: Heat dissipation coefficient [5 to 6]
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 the following for heat generated by the servo amplifier.
Page 101 Servo amplifier generated heat
"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. The following lists the cabinet
dissipation area for each servo amplifier (guideline) when the servo amplifier is operated at an ambient temperature of 40 °C
under rated load.
Page 101 Servo amplifier generated heat
(Outside the
cabinet)
(Inside the cabinet)
When air flows along the outer wall of the cabinet, effective heat exchange is possible, because the temperature slope inside
and outside the cabinet is steeper.

When using the servo amplifier with the DC power supply input

The power supply capacity is the same as that for the AC power supply input.
Page 97 Power supply capacity and generated loss
5 CHARACTERISTICS
102
5.2 Power supply capacity and generated loss
2
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Air flow