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MDS-D-SVJ3/SPJ3 Series Instruction Manual
1-4 Installation of the drive unit
The following shows a calculation example for considering heat radiation countermeasures.
<Control panel outline dimension (assumption) >
When installing four units which have the heating value in the panel of 15W
Heat radiation area (A): When a bottom section contacts with a machine
(Note) Actually, sections contacting other objects are excluded.
Heating value in panel (W): when installing four units which are 15W
W = 15 x 4 = 60 (W)
<Considering necessity of agitating fan>
1 Temperature standard
(1) Standard of temperature in panel (around each unit) T 55°C
(2) External peripheral temperature Ta = 0 to 45°C
(3) Internal temperature rise value DT = T - Ta (MAX) = 10°C
2 Cooling capacity of control panel (W1)
W1 = U x A x DT DT = Internal temperature rise value (=10°C)
U = 6W/m
2
・ °C (with internal agitating fan)
4W/m
2
・ °C (without internal agitating fan)
A = Effective heat radiation area (m
2
)
(1) With internal agitating fan W1 = 6 x 1.26 x 10 = 75.6 (W) > 60 (W)
(2) Without internal agitating fan W1 = 4 x 1.26 x 10 = 50.4 (W) < 60 (W) -- Internal fan is required.
Measure an actual internal temperature, and install a fan or heat exchanger which agitates the heat at
the top of the unit if the temperature rise exceeds 10°C.
Top of panel inside Fan for agitating
600
300
600
(Top face) (Front/back face)
(Side face)
POINT