MD600 Series Compact AC Drive Hardware Guide-EN-B06.PDF - 第42页
Electrical Design ‑41‑ Table 4–10 Minimum ventilation area of the cabinet air outlet (single-phase 200 V to 240 V) Structure Power (kW) Quantity Min. Ventilation Area of Air Outlet for Direct‑Ventilation Cabinet (cm 2 ) …
Electrical Design
‑40‑
Table 4–9 Minimum ventilation area of the cabinet air inlet (three-phase 380 V to 480 V)
Structure
Power (kW) Quantity
Min. Ventilation Area of Air
Inlet for Direct‑Ventilation
Cabinet (cm
2
)
T1
0.37 1 20.5
0.75 1 20.5
1.5 1 16.2
2.2 1 16.2
T2
4 1 22
5.5 1 22
For example, on the plate shown in the following figure, the size of each hole is C x C,
and there are 9 holes. Therefore, the ventilation area of the air outlet is 9 x C x C.
The preceding tables apply only to a single product. For a cabinet containing multiple
products, calculate the total ventilation area by adding the ventilation area of each
product.
For example, a cabinet contains the following products:
T1 model (single-phase 0.37 kW) + T1 model (single-phase 1.5 kW) + T2 model (single-
phase 2.2 kW) + T1 model (three-phase 0.75 kW) + T1 model (three-phase 2.2 kW) + T2
model (three-phase 4 kW). Therefore, the minimum ventilation area of the cabinet air
inlet should be 20.5 + 16.2 + 22 + 20.5 + 16.2 + 22 = 117.4 cm
2
.
For air inlets installed with a filtering net, the air inlet resistance increases substantially.
In this case, the minimum ventilation area of the air inlet must be increased to 1.2 to 1.5
times the value listed in the preceding table. The ventilation area in the preceding tables
refers to the actual through-hole area of the opening. The ventilation area is calculated
by the following: opening area x opening rate.
Air outlet
To ensure sufficient heat dissipation of the drive, hot air in the cabinet must be exhausted
to the outside. Use the active ventilation design for the cabinet.
Electrical Design
‑41‑
Table 4–10 Minimum ventilation area of the cabinet air outlet (single-phase 200 V to 240
V)
Structure
Power (kW) Quantity
Min. Ventilation Area of Air
Outlet for Direct‑Ventilation
Cabinet (cm
2
)
T1
0.37 1 32.8
0.75 1 26
1.5 1 26
T2 2.2 1 35.5
Table 4–11 Minimum ventilation area of the cabinet air outlet (three-phase 380 V to 480
V)
Structure
Power (kW) Quantity
Min. Ventilation Area of Air
Outlet for Direct‑Ventilation
Cabinet (cm
2
)
T1
0.37 1 32.8
0.75 1 32.8
1.5 1 26
2.2 1 26
T2
4 1 35.5
5.5 1 35.5
Note
The effective area of the air outlet is the actual ventilation area instead of the gross open-
ing area.
For example, on the plate shown in the following figure, the size of each hole is C x C,
and there are 9 holes. Therefore, the ventilation area of the air outlet is 9 x C x C.
Electrical Design
‑42‑
The preceding tables apply to only an individual product. When multiple drives are
installed in the cabinet, the total ventilation area is the sum of all the above-mentioned
ventilation areas. If the air outlet is installed with a filter screen, the air outlet resistance
increases substantially. In this case, the minimum effective area of the air outlet is
1.2...1.5 x values listed in the preceding table. The ventilation area in the preceding
tables refers to the actual through-hole area of the opening. The ventilation area is
calculated by the following: opening area x opening rate.
For example, a cabinet contains the following products:
T1 model (single-phase 0.37 kW) + T1 model (single-phase 1.5 kW) + T2 model (single-
phase 2.2 kW) + T1 model (three-phase 0.75 kW) + T1 model (three-phase 2.2 kW) + T2
model (three-phase 4 kW). Therefore, the minimum ventilation area of the cabinet air
outlet should be 32.8 + 26 + 35.5 + 32.8 + 26 + +35.5 = 188.6 cm
2
. In active air ventilation
mode, a fan is installed at the top of the cabinet to draw hot air out of the cabinet. This is
a commonly used ventilation mode. To ensure that the hot air can be exhausted to the
outside, the total air volume of the fan cannot be smaller than that of all drives in the
cabinet.
The following table lists the cooling air volume required by the AC drive.
Table 4–12 Cooling air volume (single-phase 200 V to 240 V)
Structure
Power (kW) Quantity
Max. Air Volume Qmax (CFM)
of the Fan at the Top of the
Cabinet
T1
0.37 1 0
0.75 1 22
1.5 1 22
T2 2.2 1 38
Table 4–13 Cooling air volume (three-phase 380 V to 480 V)
Structure
Power (kW) Quantity
Max. Air Volume Qmax (CFM)
of the Fan at the Top of the
Cabinet
T1
0.37 1 0
0.75 1 0
1.5 1 22
2.2 1 22
T2
4 1 38
5.5 1 38
The maximum air volume Qmax is the maximum value of the point where the fan P-Q
curve meets the abscissa, as shown in the following figure.