46
Clearance between Racks The
Racks need to have suf
ficient room between each other to allow for I/O wir
-
ing,
and additional room to ensure that the I/O wiring does not hamper cooling.
The Racks must also be mounted so that the total length of the Connecting
Cable
between all Racks in a given series does
not exceed 50 m. As a general
rule,
about 70 to
120 mm should be left between any two Racks. Consider fac
-
tors
such as the width of the wiring
duct, wiring length, ventilation, and ease of
access
to
Units, when determining the spacing between Racks. Greater space
is required between Racks when using certain CPU Bus and Special I/O Units.
Refer to the operation manuals for the Units you are using for details.
Cooling Fan A
cooling fan is not always necessary
, but may be needed in some installations.
Try
to avoid mounting the PC in a warm area or over a source of heat. A cooling
fan is needed if the ambient temperature may become higher than that speci-
fied.
If
the PC is mounted in an enclosure, install a cooling fan, as shown in the
following diagram, to maintain the ambient temperature within specifications.
PC
Fan
Louver
3-3 Mounting Racks
Each
Rack must be mounted vertically
, that is, with the printing on the front pan
-
els oriented as it would normally read. Racks may be directly mounted to any
sturdy support meeting the environmental specifications.
Whenever possible, use wiring conduit to hold the I/O wiring. Standard wiring
conduit
should be used, and
it should be long enough to completely contain the
I/O wiring and keep it separated from other cables.
Mounting Racks Section 3-3
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