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50
Affinity User Guide
www.controltechniques.com Issue Number: 5
3.8 Enclosing standard drive for high
environmental protection
An explanation of environmental protection rating is provided in section
12.1.9
Environmental Protection Rating
The standard drive is rated to IP20 pollution degree 2 (dry, non-
conductive contamination only) (UL Type 1 / NEMA 1). However, it is
possible to configure the drive to achieve IP54 rating (UL Type 12 /
NEMA 12) at the rear of the heatsink for through-panel mounting (some
current derating is required for size 1 and 2). Refer to Table 12-2 on
page 229.
This allows the front of the drive, along with various switchgear, to be
housed in an IP54 (UL Type 12 / NEMA 12) 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.
For Type 12 the drive must be mounted on a flat surface of a Type
12 enclosure.
Figure 3-44 Example of IP54 (UL Type 12 / NEMA 12) through-
panel layout
The main gasket should be installed as shown in Figure 3-45. Any
screws / bolts that are used for mounting should be installed with the
nylon washers provided in the kit box to maintain a seal around the
screw hole. See Figure 3-48.
In order to achieve the high IP rating at the rear of the heatsink with size
1 and 2, it is necessary to seal a heatsink vent by installing the IP54
insert as shown in Figure 3-46 and Figure 3-47.
Figure 3-45 Installing the gasket
IP20
(NEMA1)
IP54 (UL Type 12 / NEMA 12)
enclosure
Drive with
IP54 insert
and IP54
fan installed
Gasket
seal
Drive
Gasket
Enclosure
rear wall
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