5
vacon • 66 Installation
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5.2.3 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 28 and
Table 30 must be followed. For instance, there could be two screened gaps as presented in Figure 36
(our 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 unit
frame is given in Table 28 and Table 30. The cooling arrangements inside the cabinet must be such
that they prevent hot output air from mixing with the incoming fresh air (see Chapter 5.2.4).
The ventilation gaps must fulfill 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. In case of LCL filter air inlet 1.1 in Figure 36
cannot be used.
Figure 36. Cabinet openings for cooling
1. Cooling air inlets
2. Hot air exhaust
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