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E300 Design Guide 43
Issue Number: 1
3.7 Heatsink fan operation
The drive is ventilated by an internal heatsink mounted fan. The fan housing forms a baffle plate, channelling the air through the heatsink chamber.
Thus, regardless of mounting method (surface mounting or through-panel mounting), the installing of additional baffle plates is not required.
Ensure the minimum clearances around the drive are maintained to allow air to flow freely. The heatsink fan on all sizes is a variable speed fan. The
drive controls the speed at which the fan runs based on the temperature of the heatsink and the drive's thermal model system. The maximum speed
at which the fan operates can be limited in Fan maximum Speed (H18). This could incur an output current derating. Refer to section 3.11.2 Fan
removal procedure on page 57 for information on fan removal. The size 6 and 7 is also installed with a variable speed fan to ventilate the capacitor
bank.
3.8 Enclosing standard drive for high environmental protection
An explanation of environmental protection rating is provided in section 12.1.9 IP / UL Rating .
The standard drive is rated to IP20 pollution degree 2 (dry, non-conductive contamination only) (NEMA 1). However, it is possible to configure the
drive to achieve IP65 rating (sizes 3 to 7) (NEMA 12) at the rear of the heatsink for through-panel mounting (some current derating is required). Refer
to Table 2-5 on page 15.
This allows the front of the drive, along with various switchgear, to be housed in a high IP enclosure with the heatsink protruding through the panel to
the external environment. Thus, the majority of the heat generated by the drive is dissipated outside the enclosure maintaining a reduced temperature
inside the enclosure. This also relies on a good seal being made between the heatsink and the rear of the enclosure using the gaskets provided.
Figure 3-20 Example of IP65 (sizes 3 to 7) (NEMA 12) through-panel layout
The main gasket should be installed as shown in Figure 3-21.
On drive sizes 3, 4 and 5, in order to achieve the high IP rating at the rear of the heatsink it is necessary to seal a heatsink vent by installing the high
IP insert as shown in Figure 3-23, Figure 3-24 and Figure 3-25.
IP21
(NEMA1)
IP65 (sizes 3 to 8) or IP55 (size 9 and 10)
(NEMA 12) enclosure
Drive with
high IP insert
installed
Gasket
seal
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