Heatsink Fan Operation; Enclosing Standard Drive For High Environmental Protection; Figure 3-35 Example Of Ip54 (Ul Type 12 / Nema 12) Through-Panel Layout; Figure 3-36 Installing The Gasket - Emerson unidrive sp User Manual

Safety Product Mechanical
Information Information Installation
3.8

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 size 0 to 2 is a dual speed fan and on size 3 to 6 it 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 size 3 to 6 is also installed with a variable speed fan to
ventilate the capacitor bank.
The heatsink fan on size 0 to 5 is supplied internally by the drive. The
heatsink fan on size 6 requires an external 24Vdc supply. See section
4.4 Heatsink fan supply on page 72 for more information.
3.9 Enclosing standard drive for high
environmental protection
An explanation of environmental protection rating is provided in section
12.1.9 IP / UL Rating on page 271.
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 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 266.
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 3-35 Example of IP54 (UL Type 12 / NEMA 12) through-
panel layout
IP54 (UL Type 12 / NEMA 12)
enclosure
IP20
(NEMA1)
Gasket
seal
50
Electrical Getting Basic
installation Started parameters
Drive with
IP54 insert
and IP54
fan installed
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The main gasket should be installed as shown in Figure 3-36. 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 3-39.
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 3-37 and Figure 3-38.

Figure 3-36 Installing the gasket

Drive
Onboard Advanced Technical
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Enclosure
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Unidrive SP User Guide
Issue Number: 13
UL Listing
Information
rear wall