24 Unidrive M / HS Frame 7 to 10 Power Installation Guide
Figure 3-1 Fire enclosure bottom layout
The bottom, including the part of the side considered to be part of the bottom, must be designed to
prevent escape of burning material - either by having no openings or by having a baffle construction.
This means that openings for cables etc. must be sealed with materials meeting the 5VB
requirement, or else have a baffle above. See Figure 3-2 for acceptable baffle construction. This
does not apply for mounting in an enclosed electrical operating area (restricted access) with concrete
floor.
Figure 3-2 Fire enclosure baffle construction
3.2.6 Electromagnetic compatibility
Variable speed drives are powerful electronic circuits which can cause electromagnetic interference if
not installed correctly with careful attention to the layout of the wiring.
Some simple routine precautions can prevent disturbance to typical industrial control equipment.
If it is necessary to meet strict emission limits, or if it is known that electromagnetically sensitive
equipment is located nearby, then full precautions must be observed. In-built into the drive, is an
internal EMC filter, which reduces emissions under certain conditions. If these conditions are
exceeded, then the use of an external EMC filter may be required at the drive inputs, which must be
located very close to the drives. Space must be made available for the filters and allowance made for
carefully segregated wiring. Both levels of precautions are covered in section 4.11 EMC
(Electromagnetic compatibility) on page 75.
3.2.7 Hazardous areas
The drive must not be located in a classified hazardous area unless it is installed in an approved
enclosure and the installation is certified
Not less
th a n 2 X
B affle p la te s (m a y b e
a b o ve o r b e lo w b otto m
of enclosure)
X
Bottom of fire
enclosure
Not less
than 2
times ‘X’
Baffle plates (may be above or
below bottom of enclosure)
Bottom of fire enclosure
X
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