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Affinity User Guide
21
Issue Number: 5 www.controltechniques.com
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
3.2.7 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 78
.
3.2.8 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.
Drive
5
o
5
o
N o t l e s s
t h a n 2 X
B a f f l e p l a t e s ( m a y b e
a b o v e o r b e l o w b o t t o m
o f e n c l o s u r e )
X
B o t t o m
o f f i r e
e n c l o s u r e
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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