Heat Radiation Area Of Fully Closed Type Control Panel - Mitsubishi Electric MELDAS MDS-B-SVJ2 Series Specifications And Instruction Manual

9-2-2 Heat radiation area of fully closed type control panel

Set the temperature in the fully closed type control panel (hereafter control panel) in which the servo
amplifier is stored so that the ambient temperature is 40°C +10°C or less. (Provide a 5°C allowance in
respect to the maximum working environment conditions temperature of 55°C.) The control panel heat
radiation area is usually calculated with the following expression.
P
A =
K ·△T
A : Heat radiation area (m
P : Loss generated in control panel
△T : Temperature difference between
control panel and outside air (°C)
K : Heat radiation coefficient (5 ~ 6)
When calculating the heat radiation area with
expression (9-1), use P as the total loss
generated in the control panel. Refer to the
table in section "9-2-1 Servo amplifier calorific
value" for the servo amplifier calorific values.
A indicates the area effective for heat radiation,
so if the control panel is directly installed on a
heat insulating wall, etc., provide the control
panel's surface area as an allowance.
The required heat radiation area will also differ according to the conditions in the control panel. If the
convection in the control panel is poor, effective heat radiation will not be possible. In this case, when
designing the control panel, consider the placement of devices in the control panel, and mixing the air
with a fan, etc.
Chapter 9 Characteristics
............................. (9-1)
2
)
(Outside air)
Fig. 9-2 Fully closed type control panel
temperature gradient
When air flows along the outside of the panel, the
temperature slope will become sudden, and an effective
heat exchange will be possible both inside and outside
of the fully closed control type panel.
9-4
(Inside panel)
Temperature
Air flow