Mechanical Design
‑38‑
The preceding tables apply to only a single unit. When multiple units are installed in
the cabinet, the total area of required ventilation area is the sum of all the above‑
mentioned ventilation areas.
For example, if a cabinet contains:
Power supply unit (15 kW) + Single‑axis drive unit (5.5 kW) + Dual‑axis drive unit (1.1
kW) + Dual‑axis drive unit (1.1 kW) + Single‑axis drive unit (0.4 kW),
the minimum ventilation area is 34.5 + 11.5 + 11.5 × 2 + 11.5 = 80.5 cm
2
. If an air filter
is installed at the inlet, the air inlet resistance will rise significantly and the ventilation
area must be increased to 1.2 to 1.5 times the values indicated in the tables. The
ventilation areas indicated in the preceding tables are actual through‑hole areas in
the hole zone. Ventilation area = Area of the hole zone x Hole ratio.
Exhaust Air Design on the Top of Cabinet
Hot air within the cabinet must be exhausted to the outside to ensure sufficient
cooling of the drive unit. The active air exhaust mode can be adopted for the cabinet.
Table 2–3 Minimum ventilation area of the air outlet for the power supply unit or drive unit
(three‑phase 380–480 V)
Unit Type
Power (kW)
Quantity
Minimum Ventilation
Area of the Cabinet
Air Outlet (cm
2
)
Note
Drive unit (single‑
axis)
0.4 1 18.4
0.75 1 18.4
1.5 1 18.4
2.2 1 18.4
3.7 1 18.4
5.5 1 18.4
7.5 1 18.4
Drive unit (dual‑axis)
0.4 1 18.4
0.75 1 18.4
1.5 1 18.4
2.2 1 18.4
3.7 1 18.4
Power supply unit
3.7 1 55.2
7.5 1 55.2
15 1 55.2
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