Vacon NXI, Руководство пользователя

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30 • vacon installation
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5
Type Frame Cooling air
required
(m
3
/h)
Minimum air holes on
switchgear (mm
2
)
NXI_0168 – 0300 5
NXI_0125 – 0208 6
FI9 1.150
Inlet: 55.000
Outlet: 30.000
NXI_0385 – 0520 5
NXI_0261 – 0416 6
FI10 1.400
Inlet: 65.000
Outlet: 40.000
NXI_0590 – 1030 5
NXI_0460 – 0820 6
FI12 2.800
Inlet: 130.000
Outlet: 70.000
NXI_1150 – 1450 5
NXI_0920 – 1180 6
FI13 4.200
Inlet: 195.000
Outlet: 105.000
NXI_1770 – 2700 5
NXI_1500 – 2250 6
FI14 2 × 4.200
Inlet: 2 × 195.000
Outlet: 2 × 105.000
Table 5-2. Required cooling air
5.2.2 Arranging ventilation of the enclosure
The enclosure door must be provided with air gaps for air intake. To achieve sufficient cooling inside
the cabinet, the dimensions for the total area of free openings for incoming air given in Table 5-2
must be followed. For instance, there could be two screened gaps as presented in Figure 5-7
(Vacon's recommendation). This layout ensures a sufficient air flow to the module fans as well as
cooling of the additional components.
Air outlet gaps must be situated on top of the cabinet. The minimum effective air outlet area per
converter frame is given in Table 5-2. The cooling arrangements inside the cabinet must be such
that they prevent hot output air from mixing with the incoming fresh air (see page 32).
The ventilation gaps must fulfil the requirements set by the selected IP class. The examples in this
manual apply to protection class IP21.
During operation, air is sucked in and circulated by a fan blower at the bottom of the power unit. If
the power unit is placed in the upper part of the cabinet, the fan blower will be in the mid of the
cabinet, at the height of the upper ventilation grid.
See Figure 5-7 on page 29.