Mechanical Design
‑39‑
Table 2–4 Minimum ventilation area of the air outlet for the power supply unit or drive unit
(single‑phase 200–240 V)
Unit Type
Power (kW)
Quantity
Minimum Ventilation
Area of the Cabinet
Air Outlet (cm
2
)
Note
Drive unit (single‑
axis)
0.2 1 18.4
0.4 1 18.4
0.75 1 18.4
1.5 1 18.4
2.2 1 18.4
Drive unit (dual‑axis)
0.2 1 18.4
0.4 1 18.4
0.75 1 18.4
1.5 1 18.4
2.2 1 18.4
Power supply unit
2.2 1 55.2
3.7 1 55.2
Note: The ventilation area refers to the actual ventilation area, not the area of the air
outlet.
For example, in the plate shown in the following figure, the size of each hole is C × C
and there are 9 holes, then the actual ventilation area of the air inlet is 9 × C × C.
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. If an air filter is installed at the outlet, the air outlet
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.
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 55.2 + 18.4 + 18.4 × 2 + 18.4 = 128.8 cm
2
. In the active
air exhaust mode, a fan is installed on the top of the cabinet to exhaust hot air to
outside of the cabinet. Active air exhaust is a commonly used ventilation mode. To
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