Preparations for Installation
‑26‑
Where multiple AC drives are installed in one cabinet, if the fan blows air into the air inlet
from the outside, air distribution for the drives in the cabinet will be affected, resulting in
poor cooling performance. Therefore, do not install a fan at the air inlet of the cabinet to
blow air into the cabinet.
The following table describes the minimum effective ventilation area of the cabinet
air inlet after the drive is installed in the cabinet.
Table 1–4 Minimum effective ventilation area of the cabinet air inlet
AC Drive
Minimum Effective Ventilation Area of the
Cabinet Air Inlet (cm
2
)
T1 20
T2 25
T3 (7.5 kW)
T3 (11 kW)
50
T4
T5 60
T6 and T7
102
T8 204
T9 318
The preceding table applies to situations where only one AC drive is mounted in the
cabinet. For a cabinet containing multiple AC drives, calculate the total ventilation
area by adding the ventilation area of each drive according to the table. For example,
if eight T3 models (7.5 kW), two T5 models, and one T9 drives are placed inside the
cabinet, the minimum effective ventilation area of the cabinet air inlet is 8 x 25 + 2 x
60 + 1 x 318 = 638 cm
2
.
If an air filter is installed at the air inlet, the air inlet resistance will rise significantly.
Therefore, the ventilation area of the air inlet must be increased to 1.2 to 1.5 times
the value indicated in the table.
The effective ventilation area in "
Table 1–4 Minimum effective ventilation area of the
cabinet air inlet
"
on page 26
refers to the actual through‑hole area in the opening
area, which means the effective ventilation area = opening area x opening rate.
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