Enclosing Drive For High Environmental Protection - Nidec Control Techniques Unidrive M Modular Installation Manual

Safety information
5.8 Enclosing drive for high
environmental protection
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 IP55 rating (NEMA 12) at the rear of the
heatsink for through-panel mounting.
This allows the front of the drive, along with various switchgear, to be
housed in an IP55 (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.
Figure 5-32 Example of IP55 (NEMA 12) through-panel layout
IP55 (NEMA 12)
enclosure
IP20
(NEMA1)
Gasket
seal
The main gasket should be installed as shown in Figure 5-32. 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 5-33 for details regarding IP54 protection.
It may be necessary to improve the rigidity of the through panel
mounting surface due to the larger distance between the top and bottom
mounting brackets and the need to maintain compression on the gasket.
When the drive is mounted, if the gap between the drive flange (which
the gasket rests on) and the rear wall of the enclosure is ≥6 mm at any
point around the drive then the following methods can be used to
compress the gasket further:
1. Use a thicker panel for the mounting wall of the enclosure through
which the drive is mounted.
2. Use an internal backplate to pull the rear wall of the enclosure up to
the drive gasket. See Figure 5-33 for details. (Nylon washers are
48
Introduction Product information
Drive fitted
with IP54
fan as
standard
System configuration
supplied in the standard drive kit for sealing off any nut and bolt
mountings that exit through the rear wall of the panel).
3. If an internal backplate is not available a separate clamp can be
used to simulate option 2. See Figure 5-34 on page 50. 4 off sealing
clamps are supplied in the drive kit box.
Unidrive M Modular Installation Guide
Mechanical
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