Arranging Ventilation Of The Enclosure - Vacon NX Active Front End User Manual

vacon • 60
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 22 and
Table 24 must be followed. For instance, there could be two screened gaps as presented in
Figure 39 (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 unit
frame is given in Table 22 and Table 24. 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 39
cannot be used.
5
Figure 39. Cabinet openings for cooling
1. Cooling air inlets
2. Hot air exhaust
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